A fuel production system comprising: a first modular unit comprising: a first housing; a process vessel; an agitator rotor assembly passing through the process vessel; a first drivetrain coupled to the agitator rotor assembly and configured to rotate the agitator rotor assembly; an extrusion screw passing through the process vessel; a second drivetrain coupled to the extrusion screw and configured to rotate the extrusion screw; a first separation vessel in fluid communication with the process vessel; and a product shaping system comprising an extrusion barrel, a reducer, and a die, the extrusion barrel being coupled to the process vessel, wherein at least a portion of each of the process vessel, the agitator rotor assembly, the first drivetrain, the extrusion screw, the second drivetrain, the first separation vessel, and the product shaping system are contained in the first housing; and a second modular unit configured to be coupled to the first modular unit, the second modular unit comprising: a second housing; a thermal fluid heater system configured to be in fluid communication with the process vessel; a condenser configured to be in fluid communication with the first separation vessel; a second separation vessel in fluid communication with the condenser; and a vacuum pump in fluid communication with the second separation vessel, wherein at least a portion of each of the thermal fluid heater system, the condenser, the second separation vessel, and the vacuum pump are contained in the second housing. a first modular unit comprising: a first housing; a process vessel; an agitator rotor assembly passing through the process vessel; a first drivetrain coupled to the agitator rotor assembly and configured to rotate the agitator rotor assembly; an extrusion screw passing through the process vessel; a second drivetrain coupled to the extrusion screw and configured to rotate the extrusion screw; a first separation vessel in fluid communication with the process vessel; and a product shaping system comprising an extrusion barrel, a reducer, and a die, the extrusion barrel being coupled to the process vessel, wherein at least a portion of each of the process vessel, the agitator rotor assembly, the first drivetrain, the extrusion screw, the second drivetrain, the first separation vessel, and the product shaping system are contained in the first housing; and a first housing; a process vessel; an agitator rotor assembly passing through the process vessel; a first drivetrain coupled to the agitator rotor assembly and configured to rotate the agitator rotor assembly; an extrusion screw passing through the process vessel; a second drivetrain coupled to the extrusion screw and configured to rotate the extrusion screw; a first separation vessel in fluid communication with the process vessel; and a product shaping system comprising an extrusion barrel, a reducer, and a die, the extrusion barrel being coupled to the process vessel, wherein at least a portion of each of the process vessel, the agitator rotor assembly, the first drivetrain, the extrusion screw, the second drivetrain, the first separation vessel, and the product shaping system are contained in the first housing; and a second modular unit configured to be coupled to the first modular unit, the second modular unit comprising: a second housing; a thermal fluid heater system configured to be in fluid communication with the process vessel; a condenser configured to be in fluid communication with the first separation vessel; a second separation vessel in fluid communication with the condenser; and a vacuum pump in fluid communication with the second separation vessel, wherein at least a portion of each of the thermal fluid heater system, the condenser, the second separation vessel, and the vacuum pump are contained in the second housing. a second housing; a thermal fluid heater system configured to be in fluid communication with the process vessel; a condenser configured to be in fluid communication with the first separation vessel; a second separation vessel in fluid communication with the condenser; and a vacuum pump in fluid communication with the second separation vessel, wherein at least a portion of each of the thermal fluid heater system, the condenser, the second separation vessel, and the vacuum pump are contained in the second housing.