Patent Publication Number: US-11655940-B2

Title: Systems and methods for transporting fuel and carbon dioxide in a dual fluid vessel

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority to, and the benefit of, U.S. Provisional Application No. 63/265,554, filed Dec. 16, 2021, titled “SYSTEMS AND METHODS FOR TRANSPORTING FUEL AND CO2 IN A DUAL FLUID VESSEL,” and U.S. Provisional Application No. 63/377,822, filed Sep. 30, 2022, titled “SYSTEMS AND METHODS FOR TRANSPORTING FUEL AND CO2 IN A DUAL FLUID VESSEL,” the disclosures of which are incorporated herein by reference in their entireties. 
     This application is a continuation-in-part of U.S. Non-Provisional application Ser. No. 17/739,488, filed May 9, 2022, titled “SCALABLE GREENHOUSE GAS CAPTURE SYSTEMS AND METHODS,” which is a continuation-in-part of U.S. Non-Provisional application Ser. No. 17/652,530, filed Feb. 25, 2022, titled “SCALABLE GREENHOUSE GAS CAPTURE SYSTEMS AND METHODS,” and which claims priority to related to U.S. Provisional Application No. 63/200,581, filed Mar. 16, 2021, titled “SCALABLE GREENHOUSE GAS CAPTURE SYSTEMS AND METHODS,” and U.S. Provisional Application No. 63/267,567, filed Feb. 4, 2022, titled “SCALABLE GREENHOUSE GAS CAPTURE SYSTEMS AND METHODS,” the disclosures of which are incorporated herein by reference in their entireties. 
     This application is a continuation-in-part of U.S. Non-Provisional application Ser. No. 17/652,530, filed Feb. 25, 2022, titled “SCALABLE GREENHOUSE GAS CAPTURE SYSTEMS AND METHODS,” which claims priority to and the benefit of U.S. Provisional Application No. 63/200,581, filed Mar. 16, 2021, titled “SCALABLE GREENHOUSE GAS CAPTURE SYSTEMS AND METHODS,” and U.S. Provisional Application No. 63/267,567, filed Feb. 4, 2022, titled “SCALABLE GREENHOUSE GAS CAPTURE SYSTEMS AND METHODS,” the disclosures of which are incorporated herein by reference in their entireties. 
    
    
     FIELD OF INVENTION 
     The present disclosure relates to systems and methods for backhaul transportation of fuel and carbon dioxide. More specifically, the present disclosure relates to methods and systems for transporting fuel and carbon dioxide using a dual-fluid vessel. 
     BACKGROUND 
     Certain gases, such as carbon dioxide, carbon monoxide, nitrogen dioxide, sulfur dioxide, benzene, formaldehyde, polycyclic hydrocarbons, other particulate matter, etc., when released to the atmosphere are purported to adversely contribute to climate change and have been labeled as greenhouse gases. To mitigate perceived climate change or meet private, public, country, state, or global commitments/policies, much worldwide attention and focus has been placed on reducing the release of these greenhouse gases to atmosphere, e.g., as shown via The Paris Agreement. Greenhouse gases, such as carbon dioxide, are directly released to atmosphere through the combustion of fossil fuels, for example, in a vehicle or other vehicles that utilize fossil fuels. Further, atmospheric carbon dioxide may absorb heat that could otherwise be directed to space. The residence time of atmospheric carbon dioxide paired with accumulation may be cause for global focus. 
     Currently, the majority of motorist vehicles sold and in use are internal combustion engine motorist vehicles. Further, internal combustion engine motorist vehicles are affordable and widely available. Further still, the majority of fueling infrastructure within the United States, as well as globally, is constructed to support or provide fuel to internal combustion engine motorist vehicles. While other motorist vehicle options exist, such as fuel cell or electric based motorist vehicles, such options are costly and currently lack range and the extensive infrastructure typically associated with internal combustion engine motorist vehicles. 
     To offset greenhouse gas emissions produced by motorist vehicles or other vehicles, a user may purchase an alternative fuel vehicle (e.g., fuel cell or battery electric vehicles). However, manufacturing such vehicles produces some level of greenhouse gases and, as noted, may not be affordable or widely available. Further, both manufacturing of electric vehicles and components, as well as the production of the electricity to charge electric vehicles may produce some level of greenhouse gases. Additionally, the raw materials (e.g., lithium, nickel, manganese, cobalt, etc.) for such electric and other alternative powered vehicles or devices may create economic in-balances due to source geology and supply/demand fundamentals. In addition, infrastructure to fuel or charge such vehicles is not extensive or widely available and will require significant capital deployment. As an alternative, the motorist or user may purchase credits to offset any greenhouse gas emissions produced by operating the internal combustion motor vehicle. Such credits may be used to plant trees that capture an equivalent amount or portion of greenhouse gases from the air or other certified sources. However, such greenhouse gas offsetting programs are limited and may not fully mitigate the full scope of greenhouse gas emissions and the land-use impact is largely unknown. One viable alternative for directly reducing greenhouse gas emissions is to capture carbon dioxide produced by and found in the combustion products emitted from an internal combustion engine vehicle, while the vehicle is in motion. Many innovations exist relating to carbon capture, particularly around on-board vehicle carbon capture. While such innovations are available, no solution is known to exist for the efficient off-loading and transfer and/or transport of the captured carbon dioxide, whether in liquid or gas form. 
     Further, captured carbon dioxide is typically incompatible with other fluids and must be transported in a specialized and separate transportation vessel. Typically, two separate transportation vehicles would be used for such transportation, e.g., one to transport liquid fuel and one to transport carbon. 
     SUMMARY 
     Applicant has recognized that transporting captured greenhouse gas emissions using a specialized and separate vehicle is inefficient, when other fluids, such as fuel, may be delivered to the same location. The additional use of a specialized and separate transportation vehicle for transporting captured carbon increases the number of transportation vehicles used at a location, which impacts emissions produced. 
     Applicant has recognized the problems noted herein, and the present disclosure is directed to embodiments of systems and methods of dual-fluid transportation of fuel and carbon dioxide (CO 2 ) in a dual-fluid vessel thereby eliminating or reducing the number of transportation vehicles used to transport both fuel and carbon dioxide. 
     For example, the present disclosure includes embodiments of a dual-fluid vessel configured to connect to a transportation vehicle for transporting a fuel and CO 2 . The dual-fluid vessel may include an outer shell that has an outer surface. The embodiment may further include two or more inner compartments positioned within the outer shell. The two or more inner compartments may have a first inner compartment that may store CO 2  and a second inner compartment that may store fuel. Insulation may be positioned between the outer surface and the two or more inner compartments to provide temperature regulation for the CO 2 , and in some examples the fuel, when positioned in the respective first and second inner compartments. The dual-fluid vessel may also include one or more ports. Each of the one or more ports may have an opening in and through the outer shell and a fluid pathway to one or more of the first inner compartment or the second inner compartment thereby. The one or more ports may provide fluid communication through the opening and fluid pathway for loading or offloading one or more of the fuel or CO 2 . 
     Accordingly, an embodiment of the disclosure, for example, is directed to a dual-fluid transport system. The dual-fluid transport system may transport a fuel and CO 2 . The system may be configured to store or contain a fuel to be delivered to a location or preselected location. The system may further be configured to store or contain CO 2  that may be retrieved at the same location or preselected location and delivered to another location. Two or more storage tanks may be positioned at the location. One or more of the two or more storage tanks may be configured to store the fuel and while another one or more of the two or more storage tanks may be configured to store the CO 2 . 
     The system may also include a transportation vehicle for transporting the fuel and CO 2 . The transportation vehicle may have or include one or more controllers or a control system configured to control offloading and/or loading of the fuel and/or CO 2 . The one or more controllers or the control system may comprise or include a user interface to allow an operator to select offloading and/or loading operations for the fuel and CO 2 . The transportation vehicle may further include a fuel pump controlled by the one or more controllers or the control system. The fuel pump may be in fluid communication with a tank storing or containing the fuel. The transportation vehicle may also include a CO 2  pump controlled by the one or more controllers or the control system. The CO 2  pump may be in fluid communication with a tank storing or containing the CO 2 . One or more digital gauges may be positioned on the transportation vehicle and/or adjacent and/or proximate one or more of the one or more controllers. The one or more digital gauges may display one or more of pressures, flowrates, thermodynamic characteristics, or compartment level of two or more inner compartments of the transportation vehicle. 
     The system may further include a dual-fluid vessel configured to connect to a transportation vehicle for transporting the fuel and the CO 2 . The dual-fluid vessel may include an outer shell that has an outer surface. In an embodiment, the dual-fluid vessel may further include two or more inner compartments positioned within the outer shell. The two or more inner compartments may comprise, at least, a first inner compartment that may store CO 2  and a second inner compartment that may store fuel. Insulation may be positioned between the outer surface and the two or more inner compartments to provide temperature regulation for the CO 2 , and, in some examples, the fuel, when positioned in the respective first and second inner compartments. The dual-fluid vessel may also include one or more ports. Each of the one or more ports may have an opening in and through the outer shell and a fluid pathway to one or more of the first inner compartment or the second inner compartment. The one or more ports may provide fluid communication through the opening and fluid pathway for loading or offloading of one or more of the fuel or CO 2 . 
     The system may further include one or more external hoses having a proximal end portion attached to a first adapter and a distal end portion attached to a second adapter. The proximal end portion may be positioned to be in fluid communication between the first compartment or the second compartment via the fuel pump and CO 2  pump. The distal end portion may be positioned to be in fluid communication with each of the one or more storage tanks. In an embodiment, the distal end portion of one of the external hoses may comprise a nozzle connector configured to assist with or enable removal of CO 2  from the vessel when positioned in the first inner compartment. 
     In another embodiment, the first inner compartment or the second inner compartment may comprise a bladder. In such an embodiment, the bladder (e.g., for example, the second inner compartment) may be positioned within the other inner compartment (e.g., for example, the first inner compartment). As the bladder is filled with a fluid (e.g., fuel or CO 2 ), the bladder may expand. As fluid (e.g., fuel or CO 2 ) is removed from the bladder, the bladder may retract or contract. 
     In another embodiment, the fuel may comprise one of an ultra-low sulfur diesel (ULSD), diesel, gasoline, renewable diesel, hydrogen, ammonia, ethanol, or liquefied natural gas (LNG). The transportation vehicle may comprise one of a semi-tractor, a marine vessel, or a rail locomotive. 
     Another embodiment of the disclosure is directed to dual-fluid vessel configured to connect to a transportation vehicle for transporting a fuel and CO 2 . The dual-fluid vessel may include an outer shell, including an outer surface. The dual-fluid vessel may include an inner compartment defined by a space within the outer shell and configured to store CO 2 . The dual-fluid vessel may include a bladder positioned within the inner compartment and configured to store liquid fuel. The dual-fluid vessel may include insulation positioned between the outer surface and the inner compartment to provide temperature regulation for fuel and the CO 2 . The dual-fluid vessel may include one or more ports each having an opening in and through the outer shell and a fluid pathway to one or more of the inner compartment or the bladder to provide fluid communication through the opening for loading/offloading one or more of the fuel or CO 2 . 
     Another embodiment of the disclosure, for example, is directed to a method of offloading or loading a fuel and CO 2  at a location. The method may include stationing a transportation vehicle at a location. The transportation vehicle may have or include one or more controllers or a control system configured to control offloading or loading of the fuel and CO 2 . The one or more controllers or the control system may comprise or include a user interface to allow an operator to select offloading or loading operations of the fuel and CO 2 . The transportation vehicle may further include a fuel pump controlled by the one or more controllers or the control system. The fuel pump may be in fluid communication with the tank storing or containing fuel. The transportation vehicle may further include a CO 2  pump controlled by the one or more controllers or the control system. The CO 2  pump may be in fluid communication with the tank storing or containing CO 2 . The transportation vehicle and/or the one or more controllers or the control system may include and/or be in signal communication with one or more digital gauges. The one or more digital gauges may display one or more of pressures, flowrates, thermodynamic characteristics, or compartment level of the two or more inner compartments. 
     A dual-fluid vessel may be connected to the transportation vehicle for transporting the fuel and the CO 2 . The dual-fluid vessel may include an outer shell that has an outer surface. The dual-fluid vessel may further include two or more inner compartments positioned within the outer shell. The two or more inner compartments may have or comprise a first inner compartment that may store CO 2  and a second inner compartment may store fuel. Insulation may be positioned between the outer surface and the two or more inner compartments to provide temperature regulation for the CO 2  and, in some examples, the fuel, when positioned in the respective first and second inner compartments. The dual-fluid vessel may also include one or more ports. Each of the one or more ports may have an opening in and through the outer shell and a fluid pathway to one or more of the first inner compartment or the second inner compartment. The one or more ports may provide fluid communication through the opening and fluid pathway for loading or offloading one or more of the fuel or CO 2 . 
     The method may further include confirming contents in the first inner compartment and the second inner compartment. The method may include subsequent to content confirmation, connecting one or more external hoses having a proximal end portion and a distal end portion. The proximal end portion may be attached to a first adapter may be in fluid communication with the first compartment and the CO 2  pump on the transportation vehicle or the second compartment and the fuel pump on the transportation vehicle. The distal end portion attached to a second adapter may be in fluid communication with one or more storage tanks at the location. Each of the storage tanks may contain an amount of fuel or an amount of CO 2 . 
     The method may further include activating, via the one or more controllers or the control system, the fuel pump and the CO 2  pump to thereby supply power to the fuel pump and CO 2  pump. The amount of fuel from the second inner compartment may be pumped to the one or more storage tanks at the location. The amount of CO 2  from the one or more storage tanks may be pumped to the first inner compartment. The one or more external hoses may then be disconnected. 
     Another embodiment of the disclosure is directed to a method of offloading/loading a fuel and CO 2  at a location. The method may include stationing a transportation vehicle with a first inner compartment and a second inner compartment of a dual-fluid vessel at a location. The method may include, in response to an amount of fuel in the second inner compartment and an operation to fill or partially fill one or more fuel storage tanks at the location, pumping an amount of fuel from the second inner compartment to the one or more fuel storage tanks at the location to thereby cause the second inner compartment to contract. The method may include, in response to no or a partial amount of CO 2  in the first inner compartment, pumping an amount of CO 2  from the one or more CO 2  storage tanks to the first inner compartment based on the amount of fuel pumped from the second inner compartment and the contents in the first inner compartment. 
     In another embodiment, the method may further include, subsequent to pumping the amount of fuel from the second inner compartment and if no or traces amount of fuel remains in the second inner compartment, purging the second inner compartment to remove substantially all traces of fuel within the second inner compartment. The method may also include, subsequent to pumping the amount of CO 2  to the first inner compartment and in response to a determination that the first inner compartment is partially filled and the second inner compartment is empty or partially filled, pumping an amount of nitrogen into one or more of the first inner compartment or second inner compartment to prevent movement of CO 2  within the first inner compartment while the transportation vehicle transports the CO 2 . 
     Still other aspects and advantages of these embodiments and other embodiments, are discussed in detail herein. Moreover, it is to be understood that both the foregoing information and the following detailed description provide merely illustrative examples of various aspects and embodiments, and are intended to provide an overview or framework for understanding the nature and character of the claimed aspects and embodiments. Accordingly, these and other objects, along with advantages and features herein disclosed, will become apparent through reference to the following description and the accompanying drawings. Furthermore, it is to be understood that the features of the various embodiments described herein are not mutually exclusive and may exist in various combinations and permutations. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       These and other features, aspects, and advantages of the disclosure will become better understood with regard to the following descriptions, claims, and accompanying drawings. It is to be noted, however, that the drawings illustrate only several embodiments of the disclosure and, therefore, are not to be considered limiting of the disclosure&#39;s scope. 
         FIG.  1    is a schematic diagram illustration of a dual-fluid transport system for transporting fuel and carbon dioxide, according to an embodiment of the disclosure. 
         FIG.  2 A  is a schematic diagram illustration of a semi-tractor with an attached dual-fluid vessel having a horizontal expandable bladder for fuel, according to an embodiment of the disclosure. 
         FIG.  2 B  is a schematic diagram illustration of a semi-tractor with an attached dual-fluid vessel having a vertically expandable bladder for fuel, according to an embodiment of the disclosure. 
         FIG.  3 A  is a schematic diagram illustration of a semi-tractor with one or more controllers or a control system, pumps, and an attached dual-fluid vessel having a vertically expandable bladder for fuel, according to an embodiment of the disclosure. 
         FIG.  3 B  is a schematic diagram of a semi-tractor with an attached dual-fluid vessel having a fixed portion with a horizontally expandable bladder on each side of the fixed portion, according to an embodiment of the disclosure. 
         FIG.  3 C  is a schematic diagram of a semi-tractor with an attached dual-fluid vessel having a fixed portion with a horizontally expandable bladder on each side of the fixed inner surface controlled by a spring system, according to an embodiment of the disclosure. 
         FIG.  3 D  is a schematic diagram of a semi-tractor with an attached dual-fluid vessel having a fixed portion with a horizontally expandable bladder on each side of the fixed inner surface controlled by a hydraulic system, according to an embodiment of the disclosure. 
         FIG.  3 E  is a schematic diagram of a fixed portion with a horizontally expandable bladder controlled by a hydraulic system, according to an embodiment of the disclosure. 
         FIG.  4    is a schematic diagram illustration of a semi-tractor with an attached dual-fluid vessel having two fixed inner compartments, according to an embodiment of the disclosure. 
         FIG.  5    is a schematic diagram illustration of a semi-tractor with one or more controllers or a control system, pumps, and an attached dual-fluid vessel having two fixed inner compartments, according to an embodiment of the disclosure. 
         FIG.  6 A  is a schematic diagram illustration of a marine vessel for transporting fuel and CO 2  in a dual-fluid vessel, according to an embodiment of the disclosure. 
         FIG.  6 B  is a schematic diagram illustration of a LNG vessel for transporting fuel and CO 2  in a dual-fluid vessel, according to an embodiment of the disclosure. 
         FIG.  7    is a schematic diagram illustration of a rail locomotive for transporting fuel and CO 2  in a dual-fluid vessel, according to an embodiment of the disclosure. 
         FIG.  8 A  is a schematic diagram illustration of a dual-fluid vessel with an expanded partially-full bladder of fuel, according to an embodiment of the disclosure. 
         FIG.  8 B  is a schematic diagram illustration of a dual-fluid vessel with an expanded partially-full bladder of fuel and liquid CO 2  in the first inner compartment, according to an embodiment of the disclosure. 
         FIG.  8 C  is a schematic diagram illustration of a dual-fluid vessel with an expanded partially-full bladder of fuel and nitrogen in the first inner compartment filled with external nitrogen storage vessels, according to an embodiment of the disclosure. 
         FIG.  8 D  is a schematic diagram illustration of a semi-tractor having a dual-fluid vessel with an expanded partially-full bladder of fuel and nitrogen in the first inner compartment filled with on-board nitrogen storage vessels, according to an embodiment of the disclosure. 
         FIG.  9 A  is a schematic diagram illustration of a dual-fluid vessel with a partially-full bladder of fuel and a first inner compartment with a negligible amount of N 2 , according to an embodiment of the disclosure. 
         FIG.  9 B  is a schematic diagram illustration of a dual-fluid vessel with a partially-full bladder of fuel and nitrogen in the first inner compartment, according to an embodiment of the disclosure. 
         FIG.  9 C  is a schematic diagram illustration of a dual-fluid vessel with a partially-filled or empty bladder of fuel in the first inner compartment, according to an embodiment of the disclosure. 
         FIG.  9 D  is a schematic diagram illustration of a dual-fluid vessel with a partially-filled bladder of fuel in the first inner compartment, according to an embodiment of the disclosure. 
         FIG.  10    is a simplified block diagram for transporting a fuel and carbon dioxide, according to an embodiment of the disclosure. 
         FIG.  11    is a flow diagram that illustrates offloading/loading a fuel and carbon dioxide, to an embodiment of the disclosure. 
         FIG.  12    is a simplified diagram implemented in a controller, for controlling offloading and onloading operations, according to an embodiment of the disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     So that the manner in which the features and advantages of the embodiments of the systems and methods disclosed herein, as well as others, which will become apparent, may be understood in more detail, a more particular description of embodiments of systems and methods briefly summarized above may be had by reference to the following detailed description of embodiments thereof, in which one or more are further illustrated in the appended drawings, which form a part of this specification. It is to be noted, however, that the drawings illustrate only various embodiments of the embodiments of the systems and methods disclosed herein and are therefore not to be considered limiting of the scope of the systems and methods disclosed herein as it may include other effective embodiments as well. 
     In one or more embodiments, as illustrated in  FIGS.  1 - 12   , for example, the present disclosure is directed to systems and methods for transporting a fuel and carbon dioxide (CO 2 ) in a dual-fluid vessel. Transporting fuel and CO 2  typically includes the utilization of multiple transportation vehicles designed to meet different fluid specifications. Transportation of CO 2 , for example, may include the utilization of a specialized tank for the CO 2  to remain in a liquid state. The present disclosure minimizes the number of trips to transport fuel to a location while also gathering CO 2  at the location to transport to various markets for various uses, transportation, or permanent sequestration. 
     An embodiment of a dual-fluid transport system  100  for transporting a fuel and CO 2  is illustrated in  FIG.  1   . In one or more embodiments, a dual-fluid vessel  104  may be attached to, connected to, and/or positioned on a transportation vehicle  108 . As indicated in  FIG.  1   , the transportation vehicle  108  may be positioned at a location or a preselected location (e.g., a driver, operator, or user may drive the transportation vehicle  108  to the location, for example, to deliver fuel and/or receive CO 2 ). The transportation vehicle  108  may be a semi-tractor, a marine vessel (e.g., a brown water vessel, such as a barge or river barge, or a blue water vessel, such as a marine vessel, ocean vessel, medium range (MR) tankers, general purpose tankers, etc.), or a rail locomotive and/or rail car. The transportation vehicle  108  may be designed or configured to move or transport fluid varying distances from various locations. The distance may be one or more miles from one or more of the various locations. At any one of the location, anchored fuel storage tanks  102  may store fuel and CO 2  storage tanks  106  may store CO 2 . The fuel storage tanks  102  and CO 2  storage tanks  106  may connect to the dual-fuel vessel  104  (e.g., during a fueling or CO 2  offloading operation) via one or more external hoses. In an embodiment, the fuel storage tanks  102  and/or the CO 2  storage tanks  106  may be located above grade, below grade, or some combination thereof. The location may be a retail gas station, a distribution center, a processing plant, a port, a train station, a terminal, a bus terminal, and/or any other hub. 
     The dual-fuel vessel  104  may include a CO 2  pressure relief system and a nitrogen pressure relief system. Nitrogen may be used to purge the dual-fluid vessel  104  of the fuel and/or the CO 2  or substantially all traces of the fuel and/or CO 2 . In some embodiments, the nitrogen may come from one or more storage vessels at the location may be connected to the dual-fluid vessel. For example, subsequent to pumping the fuel from a second inner compartment of the dual-fluid vessel  104  (e.g., from the second inner compartment to the one or more fuel storage tanks) and if, at least trace amounts of fuel remain in the second inner compartment, the nitrogen may be pumped into the second inner compartment to remove substantially all traces of fuel within the second inner compartment. In another example, subsequent to pumping CO 2  to a first inner compartment of the dual-fluid vessel  104  (e.g., pumping CO 2  from one or more CO 2  storage locations to the first inner compartment) and, in response to a determination that the first inner compartment is partially filled and the second inner compartment is empty or partially filled, the nitrogen may be pumped into the first inner compartment and/or second inner compartment to fill one or more of the first inner compartment or second inner compartment to prevent movement of CO 2  within the first inner compartment while the transportation vehicle  108  transports the CO 2 . 
     The fuel transported to the location and stored in the fuel storage tanks  102  may comprise one or more of ultra-low sulfur diesel (ULSD), diesel, gasoline, renewable diesel, hydrogen, ammonia, ethanol, or liquefied natural gas (LNG), among other fuel types. The CO 2  stored in the CO 2  storage tanks  106  may comprise a gas or a liquid. To maintain CO 2  in a liquid form, the temperature of CO 2  may be maintained below the critical point and above the triple point, as well as within a threshold pressure range, as will be understood by one skilled in the art. The CO 2  may remain a gas while the CO 2  is below the critical point at approximately or about 31 degrees Celsius and below about 73 atmosphere pressure, as will be understood by one skilled in the art. 
     In some embodiments, the fuel may be offloaded from the dual-fluid vessel  104 , using one or more external hoses, to fill the fuel storage tanks  102 . An operator and/or a controller may monitor the pressure, temperature, and/or the level of fuel inside the dual-fuel vessel  104  using one or more digital gauges on the transportation vehicle. In other embodiments, a smart control board (e.g., such as one or more controllers) may calculate the amount of fuel and CO 2  remaining in the dual-fluid vessel  104 . Additionally, one or more controllers or a control system may be positioned and/or configured to monitor and/or measure characteristics (e.g., pressure, temperature, type of fuel, and/or level within the fuel storage tanks  102  via one or more sensors or probes associated with the fuel storage tanks  102 ) of the fuel storage tanks  102  at the location may have or include to monitor the pressure, temperature, and/or level inside the fuel tanks  102 . In an embodiment, the one or more controllers of the fuel storage tanks  102  or the location may connect to and/or be in signal communication with one or more controllers of the transportation vehicle  108  (e.g., to provide information regarding fuel storage tanks  102 , such as a level within the fuel storage tanks  102 , to the one or more controllers of the transportation vehicle  108 ). 
     CO 2  may be loaded onto the dual-fluid vessel  104  from the CO 2  storage tanks  106  using one or more external hoses. In other embodiments, the CO 2  may be from a source other than transportation vehicles, the being picked up from such a source and transported, via the dual-fluid vessel  104 , to another location. In an embodiment, one or more controllers may be positioned and/or configured to measure characteristics (e.g., pressure, temperature, and/or level within the CO 2  storage tanks  106  via one or more sensors or probes associated with the CO 2  storage tanks  106 ) of the CO 2  storage tanks  106 . Further, the one or more controllers of the CO 2  storage tanks  106  or the location may connect to and/or be in signal communication with one or more controllers of the transportation vehicle  108  (e.g., to provide information regarding CO 2  storage tanks  106 , such as level within the CO 2  storage tanks  106 , to the one or more controllers of the transportation vehicle  108 ). 
     According to an embodiment of the present disclosure, the semi-tractor  218  may include a dual-fluid vessel  202  configured to connect to the truck trailer  212 , as shown in  FIG.  2   . The dual-fluid vessel  202  may be fixedly or removably attached to the truck trailer  212 . In another embodiment, the dual-fluid vessel  202  may be integral or integrated with the truck trailer  212 . The semi-tractor  218  may transport the fuel and CO 2  (or other emissions stored at a location) from and/or to varying locations. The dual-fluid vessel  202  may have an outer shell  214  including an outer surface  215  and an inner surface  217 . The dual-fluid vessel  202  may further include two or more inner compartments such as, at least, a first inner compartment  208  and a second inner compartment  210  positioned within the outer shell  214 . The dual-fluid vessel  202  may be configured to store and/or compatible with fuel and CO 2 . In other embodiments, the dual-fluid vessel  202  may be compatible to store other fluids. For example, rather than or in addition to storing CO 2 , the dual-fluid vessel  202  may store engine exhaust captured from transportation vehicles. 
     In some embodiments, the dual-fluid vessel  202 , as noted, may be detachable or removable from the truck trailer  212 . The second inner compartment  210  may have a portion of surface area secured, attached, or connected to the inner surface  217  of the outer shell  214 . A portion of the surface area of the second inner compartment  210  may be secured, attached, or connected to a side wall  219  (e.g., the side wall  219  in proximity to the cab of the semi-tractor  218  or the side wall  219  furthest from the cab of the semi-tractor  218 ) of the inner surface  217  of the outer shell  214 , as illustrated in  FIG.  2 A . In other embodiments, a portion of the second inner compartment  210  may be secured, attached, or connected to a bottom wall  223  or floor of the inner surface  217  of the outer shell  214 , as illustrated in  FIG.  2 B . Such an attachment or connection between the inner surface  217  of the outer shell  214  and the second inner compartment  210  may be mechanical (e.g., bolts, fasteners, welds, etc.) or adhesive. 
     The truck trailer  212  and/or the semi-tractor  218  may be designed, for example, to support, store, or contain a maximum of 80,000 pounds (lb.), including or excluding the empty weight of the dual-fluid vessel  202 , to meet Department of Transportation (DOT) specifications. In some instances, the truck trailer  212  and/or the semi-tractor  218  may be designed to support, store, or contain a maximum of 120,000 pounds or a maximum weight, including or excluding the empty weight of the dual-fluid vessel  202 , that aligns with DOT standards or exceptions. The dual-fluid vessel  202  may be designed to meet the DOT and/or maritime specifications for shipping, rail system, or road transportation. 
     The dual-fluid vessel  202  may further be designed or configured to minimize shifting of the fluid contained therein during transportation. The outer surface  215  and inner surface  217  of the outer shell  214  of the dual-fluid vessel  202  may be designed to evenly distribute the weight of the fluid during transport. For example, the dual-fluid vessel  202  may have an obround, oblong, spherical, cylindrical, or other shape configured to prevent tipping based on movement of fluid therein. 
     The first inner compartment  208  may be configured to store CO 2 . The CO 2  may be included, along with other fluids, in captured exhaust from a motorist vehicle that is then compressed. The CO 2  may flow through a compressor at a location where the CO 2  may be converted into a liquid. The exhaust may also be converted into a liquid through temperature changes and/or through a catalyst. In other embodiments, the captured CO 2  may come from a crude CO 2  source, e.g., such as a refinery by-product. In some embodiments, the first inner compartment  208  may be compatible with CO 2  and/or fuel. In other embodiments, the first inner compartment  208  may be compatible with CO 2 . The first inner compartment  208  may store and/or be configured to be compatible with fuel. 
     In one or more embodiments, the first inner compartment  208  may be configured to withstand a selected pressure range. The selected pressure may be at least at or above the critical point of CO 2  at a first selected pressure. In one or more embodiments, the first inner compartment  208  may be maintained at a first selected temperature. The first selected temperature may be at or below the critical point of CO 2 . In other embodiments, the transportation vehicle  200  may also include a refrigeration unit for transporting liquid CO 2 . The refrigeration unit may be connected to the first inner compartment  208  to hold or maintain the first inner compartment  208  at a first selected pressure and at a temperature below the first selected temperature. The refrigeration unit may be connected to the first inner compartment  208  and second inner compartment  210 . 
     The first inner compartment  208  may fill the entire dual-fluid vessel  202 . The first inner compartment  208  may fill a portion of the dual-fluid vessel  202 . The liquid CO 2  may be high pressure liquid CO 2  or low pressure liquid CO 2 . High pressure liquid CO 2  may be produced as described above with compressing the gaseous CO 2  to about 70 bars of pressure and then cooling it to about 64 degrees Fahrenheit. Low pressure liquid CO 2  may be produced by expanding high pressure CO 2  to a lower pressure or by refrigeration to about 21 bars of pressure and temperature of about −0.4 degrees Fahrenheit. In some embodiments, the first inner compartment  208  and second inner compartment  210  may be designed and/or configured (e.g., constructed of a specified material as a specified shape to withstand a pressure range) high pressure liquid CO 2  or low pressure liquid CO 2 . Such a specified material may be designed to expand and contract. 
     In one or more embodiments, the second inner compartment  210  may store fuel. In some embodiments, the second inner compartment  210  may be a bladder. In such embodiments, the first inner compartment  208  may be defined by the space within the outer shell  214  or the space within the inner surface  217  of the outer shell  214 . Further, the bladder may be positioned within the first inner compartment  208 . The bladder may be filled with fuel. The bladder may have a portion of the surface area secured within the outer shell  214 , thereby causing expansion, during fueling, in one direction in the dual-fluid vessel  202  as shown in  FIGS.  2 A and  2 B . The bladder may be comprised of a material including a level of elasticity, thus causing the bladder to expand, during filling, and to fill the dual-fluid vessel  202  including the first inner compartment  208 . The bladder may fill the entire dual-fluid vessel  202  when filled (e.g., such that the bladder is adjacent to each side wall  219 , the upper wall  221 , and the bottom wall  223 ). The bladder may fill a portion of the dual-fluid vessel  202  (e.g., such as when the bladder is partially filled). The expansion of the bladder may be dependent on the amount of fuel (or, in another embodiment, CO 2 ) in the bladder. The bladder may be made of material compatible with fuel (and/or, in another embodiment, CO 2 ), such that the material does not deteriorate after continued exposure to fuel. The bladder may additionally be compatible with CO 2 , such that the bladder does not deteriorate and/or become brittle after continued exposure to CO 2  and/or nitrogen, particularly CO 2  maintained at low temperatures and in a liquid state. 
     The bladder may be comprised of a rubber material, a polymer material, and/or a plastic material, such as, for example, a woven polyolefin. The dual-fluid vessel  202  may be comprised of a metal, such as stainless steel, aluminum, SA 517 steel, and/or other materials. The thickness of the dual-fluid vessel  202  may be selected based on the operating parameters of liquid CO 2  or other fluid to be stored in the dual-fluid vessel  202 . The operating parameters may include temperature ranges and/or pressure ranges at which CO 2  or other fluids are and/or remain in a liquid state. The thicknesses of the dual-fluid vessel  202  may comprise about 0.1 inches, about 0.2 inches, about 0.3 inches, about 0.4 inches, about 0.5 inches, or about 1 inch or more. The diameter of the dual-fluid vessel  202  may be about 5 feet, about 6 feet, about 7 feet, or about 8 feet at the widest portion of the dual-fluid vessel  202 . In another embodiment, the dual-fluid vessel may be an obround shape, an oblong shape, a spherical shape, a cylindrical shape, or another shape configured to withstand a specified pressure and/or maintain a specified pressure range. 
     In an embodiment, pressure within the first inner compartment  208  may be controlled via a pressure regulation device. The pressure regulation device may be or include an external compressor, pump, or other device configured to increase pressure within a space. The external compressor may be positioned on or proximate the dual-fluid vessel or on the truck trailer  212 . In addition, pressure regulation device may include a pressure relief valve. The pressure relief valve may be positioned on the dual-fluid vessel. The pressure relief valve may be automatically and/or manually actuatable. Further, the dual-fluid vessel  202  may include a pressure regulator and/or monitoring device. The pressure regulator and/or monitoring device may substantially continuously monitor pressure within the dual-fluid vessel  202 , the first inner compartment  208 , and/or the second inner compartment  210 . If the pressure within the one or more of the dual-fluid vessel  202 , the first inner compartment  208 , and/or the second inner compartment  210  is outside of a threshold pressure range (e.g., the pressure at which the liquid within the first inner component and/or second inner component at a current temperature experiences a phase change to a solid or gas), then the compressor may activate to increase pressure within the first inner compartment  208  and/or second inner compartment  210  or the pressure relief valve may bleed or release pressure within the tank to decrease pressure. For example, if liquid CO 2  is stored within the first inner compartment  208  at a specified temperature, then, if the pressure moves outside of a correlated pressure range, pressure may be released (e.g., via a relief valve to decrease pressure) or pressure may be increased (e.g., via a compressor or other device to increase pressure). 
     In other embodiments, when a portion of the fuel in the bladder is offloaded and a CO 2  is added to the first inner compartment  208 , the dual-fluid vessel  202  may contain fuel in the bladder, while the bladder may be substantially surrounded by CO 2 . The bladder may contract, rescind in size, or retract as the fuel is removed from the bladder. The bladder may comprise various sizes, based on, for example, the overall size of the dual-fluid vessel  202 . In another embodiment, the bladder may be removable from the dual-fluid vessel  202 . 
     In an embodiment, the dual-fluid vessel  202  may also include insulation  206 . The insulation  206  may be positioned between the inner surface  217  and the two or more inner compartments, positioned on the outer surface  215  and covered, in an example, by a shell or jacket to protect the insulation from the environment, or positioned between the outer surface  215  and inner surface  217 . The insulation  206  may provide temperature regulation for the CO 2 , and in some examples the fuel, when positioned in the respective first and second inner compartments  208 ,  210 . The insulation may be polyurethane foam or an equivalent material and/or a shell or jacket. 
     In some embodiments, the dual-fluid vessel  202  may include a vapor barrier. The vapor barrier may provide a barrier for and/or collect vapors formed during transportation and/or potentially emitted during loading and/or offloading. For example, port  204 ,  216  may include a vapor barrier. 
     The embodiment of the dual-fluid vessel  202  may further include one or more ports  204 ,  216 . Each port  204 ,  216  may have an opening in and through the outer shell  214  and a fluid pathway to one or more of the first inner compartment  208  or the second inner compartment  210 . The ports  204 ,  216  may be positioned at other locations along the outer shell  214 , such as along one of the sides, at the rear, and/or at the top of the outer shell  214 , among other locations. For example, port  204  may be positioned on the side of the dual-fluid vessel  202  to prevent the bladder from obstructing offloading/loading operations. Ports  204 ,  216  may be located in positions accessible for operators. The ports  204 ,  216  may provide fluid communication to one or more of the first inner compartment  208  or the second inner compartment  210  thereby to provide fluid communication through the opening and a fluid pathway for loading/offloading one or more of the fuel or CO 2 , as shown in  FIG.  2   . In such embodiments, the hose may include or connect to a nozzle configured to offload selected fluids. Based on the type of fluid, specified components may be included downstream of the dual-fluid vessel  202  to pump and/or receive the fluids stored within a corresponding compartment. The ports  204 ,  216  may form a tight seal with the one or more hoses connected to the dual-fluid vessel  202 . The one or more ports  204 ,  216  may be used to purge the first inner compartment  208  and the second inner compartment  210  of residual material. The ports  204 ,  216  may include valves or other flow control devices to prevent fluid from flowing therethrough during transportation and/or prior to offloading/loading operations. 
     In an embodiment, the dual-fluid vessel  202  may comprise a new vessel (e.g., a new vessel constructed with at least two inner compartments) or may comprise a retrofitted vessel. A retrofitted vessel may include an existing vessel configured to transport fuel or other fluids. A second inner compartment (e.g., such as a bladder, flexible compartment, or inflexible compartment) may be added to and/or installed in or on the existing vessel, thus a previous single-use vessel may be converted to a dual-fluid vessel. 
     As illustrated in  FIG.  3 A , in one or more embodiments, the system  300 A may include a semi-tractor  314 . The semi-tractor  314  may further include a fuel pump  318 . The fuel pump  318  may be used to pump the fuel into the bladder. Additionally, the fuel pump  318  may be used to remove the fuel from the bladder to fuel tanks at a location. 
     In some embodiments, the semi-tractor  314  may also include a CO 2  pump  322 . The CO 2  pump  322  may be used to load CO 2  from the CO 2  storage tanks into the first inner compartment  308 . In other embodiments, the CO 2  pump  322  may be used offload the CO 2  at a location. The fuel pump  318  and CO 2  pump  322  may be a diaphragm pump or a mechanical pump, for example, as will be understood by those skilled in the art. The CO 2  pump  322  may move CO 2  from the CO 2  storage tanks into the first inner compartment  308  at a selected pressure. In other embodiments, the selected pressure may displace the fuel, thus causing the fuel to flow out of the bladder. In such embodiments, as the first inner compartment  308  fills with CO 2 , the pressure of the incoming CO 2  may displace the fuel, causing the fuel to flow out of the bladder and into the fuel tanks. 
     In some embodiments, the bladder may be offloaded using the pressure from filling the first inner compartment  308  with CO 2  to displace the fuel out of the bladder into nearby fuel storage tanks. In such embodiments, CO 2  is first loaded into the first inner compartment  308 . Utilizing the pressure of the CO 2  against the bladder, the bladder may contract, rescind in size, or retract as the fuel flows out of the port  304  for the second inner compartment  310 . Such embodiments may further include a control valve(s), flow control devices, or other dynamic control devices downstream of the bladder that are connected to the bladder and the fuel storage tanks to control the flow and/or pressure from the displacement of the fuel within the bladder into the fuel storage tanks. In this embodiment, the fuel pump  318  may not be utilized, however the CO 2  pump  322  may be utilized to fill the first inner compartment  308  and therefore displace the fuel. In some embodiments, the first compartment may be filled with nitrogen (N 2 ) to completely fill the tank during transport (e.g., such as when the bladder is partially filled and the first inner compartment  308  is partially filled). In another embodiment, offloading/loading operations may occur separately and/or sequentially. In other words, CO 2  may be loaded or offloaded first, then a transportation fuel may be offloaded from or loaded onto the dual-fluid vessel  302 . 
     One or more external hoses may be used to connect the CO 2  storage tanks to the port  324  to fill the first inner compartment  308  with CO 2  using one or more external hoses. Each of the one or more hoses may have a proximal end portion attached to a first adapter and a distal end portion attached to a second adapter. The proximal end portion of the hose may be positioned such that the first inner compartment  308  and the CO 2  pump  322  are in fluid communication. In other embodiments, the proximal end portion of the hose may be positioned such that the first inner compartment  308  and an external pump at the location are in fluid communication. The proximal end portion of the hose may be positioned such that the second inner compartment  310  and the fuel pump  318  are in fluid communication. In other embodiments, the proximal end portion of the hose may be positioned such that the second inner compartment  310  and an external pump at the location are in fluid communication. The first adapter may be configured to interlock with the ports  304 ,  324 . The first adapter may, when connected to or interlocked with the port  304 ,  324 , form a tight seal with the port  304 ,  324  to transport fuel and CO 2  at various pressures and temperatures. 
     The distal end portion of the hose may be positioned such that CO 2  may flow therethrough to the CO 2  storage tanks of the one or more storage tanks. The distal end portion of the hose may be positioned such that fuel may flow therethrough to the fuel storage tanks of the one or more storage tanks. The second adapter may interlock with an outlet of the fuel storage tanks and the CO 2  storage tanks. The second adapter may, when connected to or interlocked with the outlet of the fuel storage tanks or CO 2  tanks, form a tight seal with the outlet of the fuel storage tanks or the CO 2  storage tanks. 
     In some embodiments the semi-tractor  314  may further contain or include one or more digital gauges  328 . The one or more digital gauges  328  may display one or more of pressures, flowrates, temperature, other thermodynamic properties, and/or the compartment level in the two or more inner compartments. The one or more digital gauges may be positioned adjacent to and/or proximate to (and/or, in an embodiment, in signal communication with) one or more controllers (e.g., one or more controllers  320 ). The one or more controllers and/or sensors or probes positioned throughout the dual-fluid vessel  302  may provide values for the digital gauges to display. 
     The embodiment of system  300 A may further include one or more controllers  320  or a control system. The one or more controllers  320  may be configured to control the offloading/loading operation of the fuel and CO 2 . The one or more controllers  320  may include or may be in signal communication with a user interface configured to allow an operator to select offloading/loading operations of the fuel and CO 2 . The fuel pump  318 , in fluid communication with and/or to adjust the flow of the fuel, may be controlled by the one or more controllers  320 . Additionally, the CO 2  pump  322 , in fluid communication with and/or to adjust the flow of the CO 2 , may also be controlled by the one or more controllers  320 . The one or more controllers  320  may include a fail-safe switch to turn off the fuel pump  318  when the bladder reaches a selected capacity. The one or more controllers  320  may further include a fail-safe switch to turn off the fuel pump  318  and the CO 2  pump  322  during the offloading and loading process when the compartment level of the first inner compartment  308  or the second inner compartment  310  reaches a selected threshold level(s). In other embodiments, the one or more controllers  320  may control the refrigeration unit. In such embodiments, the CO 2  and/or fuel may be in a state (e.g., liquid or gaseous) such that the temperature is maintained within a preselected threshold range. The one or more controllers  320  may be in signal communication to determine the temperature of the CO 2  and/or fuel, and if the CO 2  and/or fuel is outside of the preselected threshold range, the one or more controllers  320  may cause the refrigeration unit to operate or cease operation (e.g., to cool or cease cooling). In some embodiments, the one or more controllers  320  may control the flow from the nitrogen storage vessels to the first inner compartment  308 . In such embodiments, the one or more controllers  320  may be in signal communication with one or more sensors to determine a current capacity of, for example, the first inner compartment  308  and/or second inner compartment  310 . If the capacity is outside of a preselected capacity range, then the one or more controllers  320  may cause nitrogen to flow into the first inner compartment  308 . Thus, the first inner compartment  308  may be filled in relation to the current capacity of the second inner compartment  310 . Such an embodiment may prevent the second inner compartment  310  from moving during transportation. 
     In some embodiments, the system  300 B may include a semi-tractor  314  with an attached dual-fluid vessel  302  a second inner compartment A  310 A, a second inner compartment B  310 B, a first inner compartment A  308 A, a first inner compartment B  308 B, and a fixed portion  330 , as illustrated in  FIG.  3 B . The second inner compartment A  310 A and second inner compartment B 310 B may be comprised of two expanding bladders is fixed to the fixed portion  330  within the outer surface area of the dual-fluid vessel  302 . The fixed portion  330  may be positioned at a center location within the length of the dual-fluid vessel  302 . The fixed portion  330  may be positioned to the left of the center location within the length of the dual-fluid vessel  302 . The fixed portion  330  may be positioned to the right of the center location within the length of the dual-fluid vessel  302 . In an embodiment, the fixed portion  330  may be integrated into the dal-fluid vessel or attached or connected to the inner surface of the outer shell of the dual-fluid vessel  302 . The two bladders may expand into the first inner compartment A  308 A or first inner compartment B 308 B. The second inner compartment A  310 A may fill the space of the first inner compartment  308 A when the bladder is expanded. The second inner compartment B  310 B may fill the space of the first inner compartment B  308 B when the bladder is expanded. The two bladders may be connected to or may be a part of the fixed portion  330 . In other words, the fixed portion  330  and the two bladders may be a single component that may be fixed or attached to the inside of the dual-fluid vessel  302 . 
     The second inner compartment A  310 A may be filled independently of the second inner compartment B  310 B using port  338 . The second inner compartment B  310 B may be filled independently of the second inner compartment A  310 A using port  336 . The first inner compartment A  308 A may be filled independently of the first inner compartment B  308 B using port  324 . The first inner compartment B  308 B may be filled independently of the first inner compartment A  308 A using port  304 . 
     In another embodiment, the system  300 C may include a dual-fluid vessel  302  having a second inner compartment A  310 A, a second inner compartment B  310 B, a first inner compartment A  308 A, a first inner compartment B  308 B, a fixed portion  330 , and one or more springs  332 A,  332 B as illustrated in  FIG.  3 C . The second inner compartment A  310 A and The second inner compartment B  310 B may be designed as described in  FIG.  3 B . The one or more springs  332 A,  332 B may further control the bladder dynamics during loading/unloading operations. The one or more spring  332 A,  332 B may be controlled by the one or more controllers  320 . For example, as the second inner compartment A  310 A is filled with fuel, the spring  332 A may retract as the fuel in the second inner compartment A  310 A applies pressure to the spring  332 A to retract the spring  332 A. As the second inner compartment B  308 B rescinds back to a static position, the spring  332 B releases to retract the second inner compartment  310 B. In another embodiment, the one or more springs  332 A,  332 B may be configured to constantly apply force to the bladder, such that when the bladder is empty, each of the springs  332 ,  332 B are in a decompressed state and the bladder does not move. In such embodiments, the one or more springs  332 A,  332 B may be configured so that when a bladder is being emptied, the one or more springs  332 A,  332 B may provide force sufficient to cause each bladder to be emptied or to continue to be emptied, for example, without the use of a pump. 
     In such embodiments, the one or more springs  332 A,  332 B may be compression springs or constant force springs. Further, a distal end of each of the one or more springs may be connected to an inner surface of each side wall of the dual fluid vessel. Each of the one or more springs may connect, attach, or be mounted to the inner surface of each side wall. For example, if a constant force spring is utilized, a cavity mount may be positioned on the inner surface of each end wall. In another example, two constant force springs may be positioned in a back-to-back configuration and mounted in such a configuration on the inner surface of each end wall. In yet another example, a compression spring may be mounted on a plate and the plate attached to the inner surface of each end wall. Further, the distal end of each spring may be adjacent to and/or attached to the bladder. The system  300 C may include additional springs mounted in various configurations, including, but not limited to, two side-by-side compression springs. The mounts or plates attached to the inner surface of each side wall may be attached mechanically, such as via fasteners (e.g., via welds, bolts, etc.). In an embodiment, other configurations of the dual-fluid vessel  302  may include similar springs and mountings, such as the dual-fluid vessel illustrated in  FIG.  3 A  (e.g., the spring may be mount on the inner surface of the top wall of the dual-fluid vessel). 
     In an embodiment, each of the springs  332 A,  332 B may be coated with or comprised of a material configured to withstand corrosion or deterioration when exposed to CO 2 , fuel, low temperatures, and/or high and/or low pressure. 
     The fixed portion  330  may be positioned at a center location within the length of the dual-fluid vessel  302 . The fixed portion  330  may be positioned to the left of the center location within the length of the dual-fluid vessel  302 . The fixed portion  330  may be positioned to the right of the center location within the length of the dual-fluid vessel  302 . The two bladders may expand into the first inner compartment A  308 A and the first inner compartment B  308 B. The two bladders  310 A,  310 B may be filled with fuel. The two bladders may be completely filled or partially filled. One of the two bladders may be completely filled or partially filled, while the other bladder is empty. 
     The second inner compartment A  310 A may be filled independently of the second inner compartment B  310 B using port  338 . The second inner compartment B  310 B may be filled independently of the second inner compartment A  310 A using port  336 . The first inner compartment A  308 A may be filled independently of the first inner compartment B  308 B using port  324 . The first inner compartment B  308 B may be filled independently of the first inner compartment A  308 A using port  304 . 
     In other embodiments, system  300 D may include a semi-tractor  314  with an attached dual-fluid vessel  302  having a second inner compartment A  310 A, a second inner compartment B  310 B, a first inner compartment A  308 A, a first inner compartment B  308 B, a fixed portion  330 , and a hydraulic system  334 A,  334 B or hydraulic subsystem or device, as illustrated in  FIG.  3 D . In another embodiment, rather than a hydraulic system  334 A,  334 B or hydraulic subsystem or device, the dual-fluid vessel may include a pneumatic device or electronically controlled device. The second inner compartment A  310 A and second inner compartment B  310 B may be comprised of two expanding bladders secured to a fixed portion  330  within the outer surface of the dual-fluid vessel  302 . The hydraulic system  334 A,  334 B may further control the bladder dynamics during loading or unloading operations. The hydraulic system  334 A,  334 B may be controlled by the one or more controllers  320  as a function of bladder  310 A,  310 B and/or flow of fluids into and/or out of the dual-fluid vessel  302 . For example, as the second inner compartment A  310 A is filled with fuel, the hydraulic system may retract as the fuel in the second inner compartment A  310 A applies pressure to the hydraulic system  334 A. As the second inner compartment B  308 B rescinds back to a static position, the hydraulic system  334 B releases to retract the second inner compartment  310 B. A detailed view of the hydraulic system is illustrated in  FIG.  3 E . 
     The hydraulic system  334 A,  334 B or hydraulic subsystem or device may be comprised of various components positioned within and external to the dual-fluid vessel  302 . For example, the hydraulic system  334 A,  334 B may include a reservoir (e.g., to contain an amount of fluid), a pump to power the hydraulic system  334 A,  334 B, various valves (e.g., to control fluid flow through the hydraulic system  334 A,  334 B), actuators (e.g., to apply pressure to the bladder), and/or pressure regulators. Similar components may be utilized for pneumatic and/or electronically controlled systems and/or devices. In an embodiment, the actuator of the hydraulic system  334 A,  334 B may be positioned within the dual-fluid system  302  (as illustrated in  FIGS.  3 D and  3 E ). The actuator may connect to the reservoir via conduit, hoses, or pipes, and pumps and/or valves. In an embodiment, the reservoir; conduit, hoses, or pipes; and pumps and/or valves may be positioned external to the dual-fluid vessel  302 . Such components may be attached to the transportation vehicle, the exterior of the dual-fluid vessel  302 , or a trailer that the dual-fluid vessel  302  is positioned on. In such an embodiment, the conduit, hoses, or pipes may connect to the actuator through the outer surface of the dual-fluid vessel  302 . 
     The fixed portion  330  may be positioned at a center location within the length of the dual-fluid vessel  302 . The fixed portion  330  may be positioned to the left of the center location within the length of the dual-fluid vessel  302 . The fixed portion  330  may be positioned to the right of the center location within the length of the dual-fluid vessel  302 . The two bladders may expand into the first inner compartment A  308 A and the first inner compartment B  308 B. The second inner compartment A  310 A and the second inner compartment B  310 B, may fill the space of the first inner compartment A  308 A and the first inner compartment B  308 B, respectively, when the bladder is expanded. The two bladders may be filled with fuel. The two bladders may be completely filled or partially filled. One of the two bladders may be completely filled or partially filled while the other bladder is empty. 
     In another embodiment, an air vent may be fixed to the fixed portion  330  to introduce air into the bladder  310 A,  310 B to avoid cavitation and/or to provide a pressure release (e.g., in case of pressure exceeding the bladder&#39;s pressure rating). 
     In another embodiment, as illustrated in  FIG.  4   , the semi-tractor  416  may have a dual-fluid vessel  408  having an outer shell  414  including an outer surface. The dual-vessel  408  may have two or more inner compartments including a first inner compartment  410  and second inner compartment  412  positioned within the outer shell  414 . The first inner compartment  410  and second inner compartment  412  may be substantially fixed in a position. In other embodiments, an outer insulation  418 ,  420  may be positioned between the outer surface and the two or more inner compartments to provide temperature regulation for the first and second inner compartments  410 ,  412 . 
     The first inner compartment  410  and the second inner compartment  412  may be fixed in size within the outer shell  414 . The first inner compartment  410  may be sized larger than the second inner compartment  410 . The second inner compartment  412  may be sized larger than the first inner compartment  412 . The first inner compartment  410  and second inner compartment  412  may be the same size. The dual-fluid vessel  408  may transport the fuel and CO 2  simultaneously. 
     The embodiment of the dual-fluid vessel  408  may further include one or more ports  404 ,  422 . Each of the one or more ports  404 ,  422  may have an opening in and through the outer shell  414  and a fluid pathway with the first inner compartment  410  or the second inner compartment  412 . The one or more ports  404 ,  422  may provide fluid communication between the first inner compartment  410  and CO 2  through the opening for offloading or loading of CO 2 . Additionally, the port  404  may provide fluid communication between the second inner compartment  412  and fuel through the opening for loading or offloading of the fuel. 
     As illustrated in  FIG.  5   , in one or more embodiments, the dual-fluid vessel  508  may further include a fuel pump  502  that may connect to the second inner compartment  512 . In some embodiments, one or more external hoses may connect to the second inner compartment  512 . The fuel pump  502  may be used to pump the fuel into the second inner compartment  512 . Additionally, the fuel pump  502  may be used to remove the fuel from second inner compartment  510  to the fuel storage tanks at a location. The port  504  extending into the opening in the second inner compartment  512  may be used to offload or load fuel. 
     In some embodiments, the semi-tractor  524  may also include a CO 2  pump  516 . One or more external hoses may be used to connect the CO 2  storage tanks to fill the first inner compartment  510  with CO 2  through the port  506 . The one or more external hoses may have a proximal end portion attached to a first adapter and a distal end portion attached to a second adapter. The proximal end portion may be positioned to be in fluid communication therebetween the first inner compartment  510  and the CO 2  pump  516 . The distal end portion may be positioned to be in fluid communication with CO 2  tanks of the one or more storage tanks. The proximal end portion may also be positioned to be in fluid communication therebetween the first inner compartment  510  and the CO 2  pump  516 . The distal end portion may be positioned to be in fluid communication with CO 2  storage tanks. The distal end portion and proximal end of the one or more hoses may include locking mechanisms. The locking mechanisms may ensure the pressure of the CO 2  remains above the critical point. In another embodiment, the distal end portion of one of the external hoses may comprise a nozzle connector configured to assist with or enable removal of CO 2  from the vessel when positioned in the first inner compartment. 
     In some embodiments, a CO 2  piping may be positioned adjacent to the dual-fluid vessel  508 . The CO 2  piping may connect to the first inner compartment  510  through an opening extending into the first inner compartment  510 . CO 2  may be removed from the first inner compartment through the port  506  extending through the outer shell of the dual-fluid vessel  508  into the first inner compartment  510 . CO 2  may further be removed using the CO 2  piping. 
     The semi-tractor  524  may further contain one or more digital gauges  526 . The digital gauges  526  may display one or more of pressures, flow rates, or the compartment level in the two or more inner compartments. 
     An embodiment of system  500  may further include one or more controllers  522 . The one or more controllers  522  may be configured to control the offloading or loading operation of the fuel and CO 2 . The one or more controllers  522  may include or may be in signal communication with a user interface configured to allow an operator to select offloading/loading operations of the fuel and CO 2 . The fuel pump  502  in fluid communication with the fuel may be controlled by the one or more controllers  522 . Additionally, the CO 2  pump  516  in fluid communication with the CO 2  may also be controlled by the one or more controllers  522 . The one or more controllers  522  may include a fail-safe switch to turn off the fuel pump  502  when the second inner compartment  512  reaches a selected threshold level or pressure. The one or more controllers  522  may further include a fail-safe switch to turn off the fuel pump  502  and the CO 2  pump  516  during the offloading process when the compartment level of the first inner compartment  510  reaches a selected threshold level or pressure. 
     The embodiment of system  500  may include sensors. The sensors may measure some characteristic of the system  500  and communicate the data to the one or more controllers  522 . The sensors may send or transmit a signal to the one or more controllers  522 , the signal indicative of some characteristic (e.g., temperature, pressure, etc.). The one or more controllers  522  may send an alert to notify an operator when the pressure (e.g., measured or indicated by a sensor) of the first inner compartment  510  and second inner compartment  512  is above a selected threshold or below a selected threshold. The one or more controllers  522  may also send alerts for temperature and level inside the first inner compartment and second inner compartment. The system may further include meters. The meters may monitor the flowrate of the fuel and CO 2  during the offloading and loading process. The sensors and meters may be in signal communication with the one or more controllers  522 . 
     In other embodiments, the dual-fluid vessel may be positioned on a marine vessel  602 , as illustrated in  FIG.  6 A . The marine vessel  602  may transport the stored fuel and CO 2  from the dual-fluid vessel in offshore bunkers to hold for future use or transport to offshore sequestration site(s). In some embodiments, fuel may be offloaded from the second inner compartment  612  on the marine vessel  602  with a stationed pipe  610  connected to the marine vessel  602  that may attach to the fuel storage  608 . A fuel pump on the marine vessel  602  may pump the fuel from the second inner compartment  612  to the fuel storage  608 . In other embodiments, fuel may be loaded from the fuel storage  608  to the marine vessel  602  into the fuel bunker  612 . In another embodiment, the second inner compartment may be a bladder. In other embodiments, the second inner compartment  612  and the first inner compartment  614  may be filled with fuel. In some embodiments, the second inner compartments  612  may be a bladder. The bladder may expand to fill the first inner compartment  614 . 
     In some embodiments, CO 2  may be offloaded from the CO 2  bunker  606  on the marine vessel  602  with a stationed pipe  604  connected to the marine vessel  602  that may attach to the CO 2  storage  606 . A CO 2  pump on the marine vessel  602  may pump the CO 2  from the first inner compartment  606  to the CO 2  storage  614 . In other embodiments, CO 2  may be loaded from the CO 2  storage  606  to the marine vessel  602  into the first inner compartment  614 . In another embodiment, the first inner compartment  614  and the second inner compartment  612  may be filled with CO 2 . 
     In some embodiments, the transportation vehicle, e.g., the marine vessel  602 , may be configured to carry both fuel and CO 2  at separate times in the same tank. In this embodiment, the dual-fluid vessel may comprise an inner compartment. The inner compartment may be the entire dual-fluid vessel. The transportation vehicle may transport fuel in the inner compartment to a location. One or more external hoses may be used to offload the fuel from the inner compartment. Nitrogen may be used between offloading the fuel and loading the CO 2  to purge the inner compartment of any remaining fuel. 
     According to an embodiment of the present disclosure, the marine vessel  620 , including one or more dual-fluid vessels  622 ,  624 ,  626 , may transport fuel and carbon dioxide as illustrated in  FIG.  6 B . The one or more dual-fluid vessels  622 ,  624 ,  626  may each have an outer shell including an outer surface. The one or more dual-fluid vessels  622 ,  624 ,  626  may further include two or more inner compartments including a first inner compartment  634  and a second inner compartment  632  positioned within the outer shell. The one or more dual-fluid vessels  622 ,  624 ,  626  may be compatible with liquefied natural gas (LNG), liquefied petroleum gas (LPG), or other liquid fuel and CO 2 . The one or more dual-fluid vessels  622 ,  624 ,  626  may be designed having high-pressure bearing capacity and lower inner temperature, which may include fully pressurized vessel(s), semi-pressurized and refrigerated vessel(s), and fully refrigerated vessel(s). The one or more dual-fluid vessels  622 ,  624 ,  626  may be designed with multiple spherical tanks, self-supporting prismatic tank(s), membranes, waffles, or barriers which could be constructed with Invar, Triplex, and other suitable alloys. The one or more dual-fluid vessels  622 ,  624 ,  626  may be designed to handle both LNG or other liquid fuel and CO 2 , whereas nitrogen or another inert gas may be used to displace residual LNG or other liquid fuel after unloading and prior to filling the vessel with CO 2 . Such embodiments may include transportation across domestic and foreign boundaries. 
     In an embodiment, the marine vessel  620  may be a Moss type vessel (e.g., as illustrated in  FIG.  6 B ). or a membrane type vessel. The Moss type vessel may include one or more tanks. As noted, the tanks may be dual-fluid vessels configured to hold or contain different fuels, liquids, or gases, as well as liquid CO 2 . In another embodiment, the Moss type vessel may include a number of tanks (e.g., three tanks, four tanks, five tanks, etc.). In such an embodiment, one or more of the tanks may be configured to hold or contain different fuels, liquids, or gases, as well as liquid CO 2 . In other words, the pressure and/or temperature rating for those tanks may be higher or lower than other tanks on the Moss type vehicle. However, such dual-fluid tanks may include an increased weight (e.g., due to materials used to construct those tanks). In a further embodiment, those tanks may be comprised of stainless steel, while the remaining tanks may be comprised of aluminum. Since stainless steel is heavier than aluminum, the dual-fluid tanks may be positioned at selected portions of the Moss type vessel to evenly distribute the additional weight. For example, the second and fourth tanks of five total tanks may be comprised of stainless steel, while the first, third, and fifth tanks may be comprised of aluminum. In such embodiments, all the tanks may be filled for a fuel delivery operation (e.g., filled with LNG, LPG, or other fluids). After delivering those fuels, the two stainless steel tanks (e.g., which may be configured to withstand higher pressure and/or lower temperatures than that of an aluminum tank) may be filled with liquid CO 2  for transport to a selected location. 
     In another embodiment, the CO 2  may be offloaded from the marine vessel  620  at a port (e.g., as illustrated in  FIG.  6 B ) or at a preselected off-shore CO 2  sequestration site. The preselected off-shore CO 2  sequestration site may comprise a platform or abandoned offshore drilling rig. The marine vessel  620  may offload the CO 2  to the platform or abandoned offshore drilling rig, causing the CO 2  to flow into an abandoned well and/or designated CO 2  sequestration formation. 
     In another embodiment, the dual fluid vessel may be positioned on a rail locomotive  706 , as illustrated in  FIG.  7   . The rail locomotive  700  may transport fuel and CO 2  in a dual-fluid vessel  704 ,  706 ,  708  to another location. In the embodiment, the second inner compartment may be a bladder. The bladder may contain fuel. The bladder may expand to fill the first inner compartment In other embodiments, the second inner compartment and the first inner compartment may be filled with fuel. In another embodiment, the first inner compartment and the second inner compartment may be filled with CO 2 . In some embodiments, the first inner compartment may be filled with CO 2 , nitrogen, or an inert gas. 
     In some embodiments, the bladder of the second inner compartment  810  is full, as illustrated in  FIG.  8 A . In the embodiment, the first inner compartment  808  may not contain CO 2  during transportation to a location to supply a location with fuel. After offloading such fuel, the first inner compartment  808  may be filled with CO 2 . When the bladder is filled with fuel  812 , the fuel  812  may fill a majority or substantially all of the space defined within the outer shell  804 . The dual-fluid vessel may further be surrounded by insulation  802  to control temperature within the second inner compartment  810  and for the first inner compartment  808 . 
     In other embodiments, the dual-fluid vessel  806  may contain fuel  812  and liquid CO 2    814 , as illustrated in  FIG.  8 B . In such an embodiment, the bladder may be partially filled with fuel  812 . The bladder of the second inner compartment  810 , may contract, rescind in size, retract, or shrink as the fuel  812  is offloaded into the fuel storage tanks. Offloading the fuel  812  may occur simultaneously or substantially simultaneously as the first inner compartment  808  is filled with liquid CO 2    814 , emptying the space within the bladder  810  as the bladder  810  contracts, rescinds, retracts, or shrinks. 
     In some embodiments, the dual-fluid vessel  806  in system  800 C, may contain fuel  812  and nitrogen (N 2 ), as shown in  FIG.  8 C . The bladder of the second inner compartment  810 , may contract, rescind in size, retract, or shrink as the fuel  812  is offloaded into the fuel storage tanks. At this time, the pressure in the bladder  810  may be greater than the pressure in the first inner compartment  808 . In such an embodiment, the bladder of the second inner compartment  810  may be filled with fuel  812 . As the bladder contracts, rescinds in size, retracts, or shrinks, the first inner compartment  808  may be filled with N 2    816 , filling the space of the bladder as the bladder rescinds in size, retracts, or shrinks. The addition of N 2    816  equalizes the pressure between the first inner compartment  808  and the second inner compartment  810  when the first inner compartment  808  is not filled with CO 2 . N 2    816  may be loaded into the dual-fluid vessel  806  from nitrogen storage vessels  818  stored at the location and connected through a fluid conduit  830  to the first inner compartment  808 . The fluid conduit  830  may directly connect to the dual-fluid vessel  806 . The fluid conduit  830  may have bi-directional flow to and from the first inner compartment  808  and the nitrogen storage vessels  818 . In these embodiments, the nitrogen  816  may be used to purge the first inner compartment  808  of any residual fluid that previously filled the first inner compartment  808 . In some embodiments, the first inner compartment  808  may be filled with fuel. The fuel may include liquids and/or solids. To prevent cross-contamination of different fuels, nitrogen may purge first inner compartment  808  after offloading of fuel. The outer shell  804  of the dual-fluid vessel  806  may also be surrounded by insulation  802 . 
     In other embodiments, on-board N 2  storage vessels  820  may supply N 2  to the first inner compartment  808  from nitrogen storage vessels  818  located on the semi-tractor, as illustrated in  FIG.  8 D . The N 2    816  may equalize the pressure between the second inner compartment  810  and the first inner compartment  808  when the first inner compartment  808  does not contain CO 2 . N 2    816  may be recycled back to the on-board N 2  storage vessels  820  when the second inner compartment  810  is emptied. A pressure relief device  824  may be positioned on the dual-fluid vessel  806 . 
     In one or more embodiments, the dual-fluid vessel  906  in system  900 A, may have a bladder  910  that is partially full, as shown in  FIG.  9 A . During transport, a bladder  910  that is partially full may move (e.g., the fluid within the bladder  910  may move around irregularly, in any direction, based on a transportation vehicles direction and speed, in other words the liquid may slosh within the bladder  910 ) around the dual-fluid vessel  906 . Without CO 2  in the first inner compartment  908 , the movement of the fluid within the bladder  910  may cause an imbalance of the transportation vehicle or inadvertent wear of the bladder  910 . To minimize such movement of the fuel  912  inside the bladder  910 , thereby stabilizing the bladder  910 , nitrogen storage vessels  914  at the location may be connected through a fluid conduit  920  or pipe to the first inner compartment  908 . The fluid conduit  920  may directly connect to the dual-fluid vessel  906 . The fluid conduit  920  may have bi-directional flow to and from the first inner compartment  908  and the nitrogen storage vessels  914 . Nitrogen may also be supplied to the vessel from on-board nitrogen storage vessels located on the transportation vehicle. 
     In other embodiments, the bladder  910  may have or include specific material and engineering properties to safely store fuel. The bladder  910  may contain or include fail safe controls. The bladder  910  may be tested e.g., cycled between a retracted and expanded state thousands of times, to ensure the bladder  910  is capable of withstanding extended use. In some embodiments, the bladder  910  may have a sensor embedded within the material to provide wear patterns, properties, etc. on and within the outer surface. 
     In some embodiments, the N 2  volume may be controlled by a control board and logic and/or a controller as a function of the volume, pressure, temperature, and material of fuel  912  within the bladder  910  which is measured and known. The control board or controller may calculate the volume of N 2  for the first inner compartment  908  to equalize the pressure within  906  by filling the first inner compartment  908  with N 2 . Filling the second compartment  910  with a selected volume of N 2  may occur automatically based on the control board or controller calculations. In other embodiments, the dual-fluid vessel  906  may further include a pressure relief device that vents to the atmosphere. 
     As illustrated in  FIGS.  9 C and  9 D , baffles  922  may be positioned within the outer shell to reduce movement of fluid within the dual-fluid vessel. As the bladder  910  expands within the dual-fluid vessel  902 , the bladder  910  may expand around the each of the baffles  922 , thus preventing a partially filled bladder  910  from moving as a transportation vehicle transports the dual-fluid vessel  902 . The baffles  922  may be installed along the upper wall or portion of the outer shell  904  of the dual-fluid vessel  902 . The baffles  922  may be fixedly or removably attached to the upper wall or portion of the outer shell  904  of the dual-fluid vessel  902 . The  922  baffles may be configured to allow the bladder  910  to expand around the baffles. The baffles  922  may include rollers to aid the bladder  910  in expanding around the baffles  922 . The baffles  922  may be solid bars or rods comprised of a material (e.g., plastic or metal) that is configured to withstand exposure to fuel and/or CO 2 , low temperatures, and/or high and/or low pressure. In an embodiment, the dual-fluid vessel may include one baffle, two baffles, three baffles, four baffles, or more. In yet another embodiment, each of the baffles  922  may include holes or apertures positioned at varying locations of each of the baffles  922 . The holes or apertures of each of the baffles  922  may allow for fluid flow between each of the baffles  922 . 
     In  FIG.  9 B , the dual-vessel  906  in system  900 B may have or include a bladder  910  that is partially full and surrounded by nitrogen  916  in the first inner compartment  908 . The nitrogen  916  may stabilize the bladder  910  partially filled with fuel  912 . Nitrogen  916  may be supplied to the first inner compartment  908  through a fluid conduit  920  that is directly connected to the dual-fluid vessel  906 . The fluid conduit  920  may have bi-directional flow to and from the first inner compartment  908  and the nitrogen storage vessels  914 . In other embodiments, the pressure from the nitrogen  916  may displace the fuel  912  from the bladder  910  into the fuel storage tanks at the location. A control valve may control the flow from the bladder into the fuel storage tanks. In some embodiments, one or more external hoses may connect to the bladder  910  to direct the flow from the bladder  910  into the fuel storage tanks. In this embodiment, the system may utilize pressure and gravity to move the fuel  912 . In other embodiments, fuel pumps may move the fuel  912  into the storage tanks. 
     In one or more embodiments, the present disclosure is directed to a method of offloading or loading fuel and CO 2  at a location.  FIG.  10    is a simplified block diagram for transporting fuel and CO 2 . As described in the present disclosure, blocks  1002 ,  1004 ,  1006 , and  1008  are not required to be executed in order. The blocks may be performed at different times or simultaneously. At block  1002 , the method begins with a transportation vehicle with an attached dual-fluid vessel arriving at a location. The dual-fluid vessel may be filled with fuel. The transportation vehicle may arrive empty to the location. 
     At block  1004 , the fuel may be offloaded from the transportation vehicle. In one or more embodiments, one or more external hoses may be used to connect the dual-fluid vessel to fuel storage tanks at the location. In other embodiments, a pump may be used to remove the fuel from the dual-fluid vessel and into the fuel storage tanks. 
     At block  1006 , CO 2  may be loaded into the transportation vehicle. In one or more embodiments, one or more external hoses may be used to connect the dual-fluid vessel to the CO 2  storage tanks. In other embodiments, a pump may be used to remove the CO 2  from the CO 2  storage tanks and into the dual-fluid vessel. At block  1008 , the transportation vehicle may leave the location, transporting the CO 2  to another location. In some embodiments, the transportation vehicle leaves the location with fuel and the CO 2 . 
     In another embodiment, a controller or one or more controllers may determine an amount of CO 2  in the first inner compartment (e.g., via a sensor or meter) and an amount of fuel in the second inner compartment (e.g., via another sensor or meter). The controller or one or more controllers may initiate an operation to fill the one or more fuel storage tanks at a location or determine whether the operation to fill the one or more fuel storage tanks at the location is initiated. Based on such an initiation and the fuel tank level, the controller may send a signal to a fuel pump to begin pumping an amount of fuel from the second inner compartment to the one or more fuel storage tanks at the location. The removal of fuel from the second inner compartment may cause the second inner compartment to contract. Further, the controller may initiate loading of an amount of the CO 2  into the first inner compartment, based on the amount of fuel in the second inner compartment and the current amount of CO 2  in the first inner compartment. 
       FIG.  11    is a flow diagram of an embodiment of a method for offloading/loading the fuel and CO 2  at a location. The method, for example, also is described with reference to system  200  of  FIG.  2   . At block  1102 , the method may be initiated by a transportation vehicle arriving at a location. The transportation vehicle may be empty or filled with fuel. The transportation vehicle may be stationed near the CO 2  storage tanks and fuel tanks. 
     At block  1004 , an operator may confirm the contents of the dual-fluid vessel. The dual vessel may have two or more inner compartments positioned within the outer shell of the dual-fluid vessel. The first inner compartment may contain CO 2 . The second inner compartment may contain fuel. At block  1106 , if the dual-fluid vessel is filled with fuel, the operator may proceed to at block  1108  to connect one or more external hoses to the fuel storage tanks, the fuel pump on the transportation vehicle, and the second inner compartment. In other embodiments, an external fuel pump may be stationed near the fuel storage tanks at the location. At block  1106 , if the second inner compartment is not filled with fuel, at block  1116 , an operator may connect one or more external hoses to the CO 2  storage tanks and to the inlet of the CO 2  pump on the transportation vehicle. In other embodiments, an external fuel pump may be stationed near the CO 2  storage tanks at the location. The external fuel pump may be connected to the fuel storage tanks and the second inner compartment to offload the fuel. 
     At block  1110 , an operator may activate the one or more controllers on the transportation vehicle. In some embodiments, the one or more controllers may control the fuel pump and the CO 2  pump. In other embodiments, the one or more controllers may be configured to send alerts when the pressure or temperature of the fuel or CO 2  reaches a selected threshold. Above the threshold, the one or more controllers may activate a fail-safe switch to turn off the pump or to stop the flow to or from the first inner compartment or the second inner compartment. 
     With the external hoses attached to the second inner compartment of the dual-fluid vessel, the fuel pump may be activated to offload fuel from the dual-fluid vessel to the fuel storage tanks, at block  1112 . The fuel pump may run until the contents of the second inner compartment are empty or until the fuel storage tanks is full. In some embodiments, the second inner compartment may be partially full. In other embodiments, the fuel may be offloaded into the bladder of the second inner compartment, using the pressure from filling the first inner compartment with CO 2  to displace the fuel in the bladder into the fuel storage tanks. A control valve may regulate the flow from the bladder into the fuel storage tanks. The bladder may contract, rescind in size, retract, or shrink as the fuel is displaced with CO 2 . In some embodiments, the first inner compartment may be filled with nitrogen. 
     At block  1114 , the one or more external hoses may be disconnected from the fuel storage tanks and the second inner compartment. The one or more external hoses may be exclusively used for offloading or loading fuel. 
     In other embodiments, after the operator at block  1108  connect one or more external hoses to the fuel storage tanks, the fuel pump on the transportation vehicle, and the second inner compartment where the second inner compartment is a bladder, an operator may connect nitrogen storage vessels to the first inner compartment. As the first inner compartment fills with nitrogen, the pressure may offload the fuel into the fuel storage tank. After the second inner compartment is emptied, the nitrogen in the first inner compartment may be recycled back to nitrogen storage vessels. In other embodiments, the nitrogen may be released to the atmosphere. In some embodiments, the second inner compartment may be filled with other fluids. 
     At block  1116 , one or more external hoses may be connected to the CO 2  storage tanks, the first inner compartment, and the CO 2  pump. In other embodiments, an external CO 2  pump may be stationed near the CO 2  storage tanks at the location. The external CO 2  pump may be connected to the CO 2  storage tanks and the first inner compartment. When the transportation vehicle arrives at a location without having to offload fuel, the one or more controllers may be activated to control the operability of the CO 2  pump and monitor the pressure, temperature, and flow of the CO 2 . 
     At block  1118 , an operator may confirm the pressure of the CO 2  storage tank. With the external hoses attached to the first inner compartment of the dual-fluid vessel, the CO 2  pump may be turned on to load CO 2  from the CO 2  storage tanks to the first inner compartment, at block  1120 . An operator may monitor the pressure, flow, and temperature of the CO 2 , the CO 2  storage tanks, and the second inner compartment, at block  1122 . If the pressure is above a set threshold at block  1124 , the CO 2  pump may run until the contents of the CO 2  storage tanks are empty or until the first inner compartment is full at block  1128 . In some embodiments, the first inner compartment may be partially full or filled. If the pressure is not above the set threshold at block  1124 , (e.g., such as the critical point) the first inner compartment may be pressurized to above the threshold, at block  1136 . The first inner compartment may also be pressurized by an external compressor at the location. In some embodiments, the first inner compartment may be cooled by a refrigeration unit until the temperature is below the set threshold at block  1136 . In other embodiments, the refrigeration unit may be used during transportation to hold the low pressure liquid CO 2  at or below the threshold value. At block  1130 , the one or more controllers may be deactivated. The one or more external hoses may be disconnected from the CO 2  storage tanks, the CO 2  pump, and the first inner compartment at block  1132 . The transportation vehicle may leave the location at block  1134 . 
     In some embodiments, the one or more external hoses may be connected to the fuel pump, the fuel storage tanks, the second inner compartment, the CO 2  pump, the CO 2  storage tanks, and the first inner compartment. The one or more controllers may activate the fuel pump and the CO 2  pump such that offloading of the fuel and loading of CO 2  occurs simultaneously or substantially simultaneously. In other embodiments, the fuel pump and the CO 2  pump may activate at staggered times, or different times. 
     In some embodiments, the one or more controllers may include controller  1202 , as illustrated in  FIG.  12   . The controller may include a processor  1204 , a memory  1206 , and offloading or onloading operations instructions  1208 . The controller  1202  may include memory  1206  and one or more processors  1204 . The memory  1206  may store instructions executable by one or more processors  1204 . In an example, the memory  1206  may be a non-transitory machine-readable storage medium. As used herein, a “machine-readable storage medium” may be any electronic, magnetic, optical, or other physical storage apparatus or cyber-physical separation storage to contain or store information such as executable instructions, data, and the like. For example, any machine-readable storage medium described herein may be any of random access memory (RAM), volatile memory, non-volatile memory, flash memory, a storage drive (e.g., hard drive), a solid-state drive, any type of storage disc, and the like, or a combination thereof. As noted, the memory  1206  may store or include instructions executable by the processor  1204 . As used herein, a “processor” may include, for example, one processor or multiple processors included in a single device or distributed across multiple computing devices. The processor  1204  may be at least one of a central processing unit (CPU), a semiconductor-based microprocessor, a graphics processing unit (GPU), a field-programmable gate array (FPGA) to retrieve and execute instructions, a real-time processor (RTP), other electronic circuitry suitable for the retrieval and execution instructions stored on a machine-readable storage medium, or a combination thereof. 
     As used herein, “signal communication” refers to electric communication such as hard wiring two components together or wireless communication, as understood by those skilled in the art. For example, wireless communication may be Wi-Fi®, Bluetooth®, ZigBee, or forms of near field communications. In addition, signal communication may include one or more intermediate controllers or relays disposed between elements in signal communication. 
     As noted, the memory  1206  may include instructions for offloading/onloading operations  1208 . The pressure sensors  1218  and sensor  1220  may send a signal to the controller  1202  indicating pressure or another characteristic (e.g., temperature, etc.) within a bladder or other compartment. The controller  1202  may perform, execute, or adjust execution of the offloading/onloading operations  1208  based on such indications. The offloading/onloading operations  1208  may include instructions may utilize characteristics or signals provided relating to bladder dynamics  1210  (e.g., wear, numbers of use, etc.), transportation pump  1212  (e.g., flow rate of fuel), CO 2  Pump  1214  (e.g., flow rate of CO 2 ), and N 2  Operation  1216  (e.g., amount of nitrogen to purge and/or fill the bladder or other compartment). Offloading operations may include controlling the flow from the first inner compartment and second inner compartment and shutting off pumps when pressure is outside of safe operating conditions. Onloading operations may include controlling flow from storage tanks at a location and shutting off pumps when pressure is outside of safe operating conditions. The offloading/onloading operations  1208  may utilize the bladder dynamics to control the operation of a spring system and hydraulic system of a bladder and may further include reducing the hydraulic system pressure when fuel is loaded into the bladder to expand the surface area of the bladder. When the fuel is offloaded, the hydraulic system may increase in pressure to reduce the capacity of the bladder. In some embodiments, the controller  1202  may control the operation of the transportation pump  1212  and CO 2  pump  1214 . In other embodiments, the controller  1202  may control N 2  operation  1216  from nearby nitrogen storage vessels or on-board nitrogen tanks. The controller  1202  may determine, based on signals from the pressure sensors  1218 , when N 2  may be added to the first inner compartment. 
     In a further embodiment, the controller  1202  may include instructions to maintain a specified temperature range and/or pressure range within one or more of the first inner compartment and/or second inner compartment during transit. Such instructions may utilize the same or similar components utilized for offloading/onloading operations. Upon execution of the instructions, during transit, the controller  1202  may determine a current temperature of a first inner compartment and/or second inner compartment (e.g., via sensors  1220  for example and/or other temperature sensors positioned throughout a dual-fluid vessel), a current pressure of the first inner compartment and/or second inner compartment (e.g., via pressure sensors  1218 ), a fluid level of a first inner compartment (e.g., via sensors  1220  for example and/or other temperature sensors positioned throughout a dual-fluid vessel), and/or a fluid level of the second inner compartment (e.g., via sensors  1220  for example and/or other temperature sensors positioned throughout a dual-fluid vessel). The controller  1202  may include or store (e.g., for example, in memory  1206 ) various pressure ranges for different fluids. After an offloading/onloading operation, the controller  1202  may receive an indication on the type of fluid currently contained in the dual-fluid vessel and in which compartment. The controller  1202  may determine the pressure and/or temperature ranges based on the type of fluid (e.g., liquid CO 2  and/or liquid fuel) and how much of that type of fluid is in one of the compartments. The controller  1202  may monitor the current temperature and/or pressure continuously or substantially continuously. If the current temperature and/or pressure is less than the temperature and/or pressure range, the controller  1202  may cause a pump or compressor attached to or proximate to the dual-fluid vessel to activate and operate until pressure is within the range. If the current temperature and/or pressure is greater than the temperature and/or pressure range, the controller  1202  may cause a relief valve to actuate to decrease pressure within the dual-fluid vessel. The controller  1202  may also control a refrigeration unit to maintain the temperature range. 
     Although specific terms are employed herein, the terms are used in a descriptive sense only and not for purposes of limitation. Embodiments of systems and methods have been described in considerable detail with specific reference to the illustrated embodiments. However, it will be apparent that various modifications and changes can be made within the spirit and scope of the embodiments of systems and methods as described in the foregoing specification, and such modifications and changes are to be considered equivalents and part of this disclosure.