Patent ID: 8043588

Claim:
A method for energy-efficient capture and separation of CO 2 from a gas phase, comprising: bringing the gases that are to be purified into contact with one or more CO 2 -absorbents under absorption conditions which are such that at least a proportion of the gas' CO 2 -content is absorbed, whereupon the purified gas is sent for after-treatment/venting to the atmosphere, bringing the at least one CO 2 -enriched absorbent into desorption conditions by the supply of thermal energy, with the result that at least one absorbent is regenerated by the absorbed CO 2 being released from the absorbent(s) and forming a gas phase consisting of substantially pure CO 2 , collecting the substantially pure CO 2 gas phase and sending the collected substantially pure CO 2 gas phase for depositing and/or downstream after-treatment, and receiving the gas that is to be purified from one or more primary CO 2 -generating processes, wherein at least a part of the thermal energy required to bring the at least one enriched absorbent into the desorption conditions is provided by heat exchanging with an exhaust gas from a secondary CO 2 -generating process where a substantially pure carbonaceous fuel is combusted in a substantially pure oxygen atmosphere, thereby forming an energy-rich exhaust gas consisting of substantially pure CO 2 and steam, wherein an amine-based scrubber plant is employed comprising one or more absorption columns and one or more desorption columns as CO 2 , capture and separation plant, wherein the absorbent is monoethanolamine, absorption and desorption processes are conducted at around, ambient pressure, which is approximately 1 bar, and the absorbent has a temperature between 20 and 60° C., during the absorption process and between 120 and 160° C., during the desorption process.