PROCESS FOR CAPTURING CO_2 FROM A CO_2 -CONTAINING GAS STREAM USING A THERMORESPONSIVE COPOLYMER

摘要

The present invention, in the vessel up to a temperature T1 CO ₂ of the absorbent step-by step of contacting a gas containing stream resulting in the absorption of CO _2, the CO ₂ - - absorber and CO ₂ absorbent is a polymer which is soluble in an aqueous medium Wherein the polymer is a thermally reactive copolymer comprising an amine monomer dispersed through a copolymer; And CO ₂ in the vessel up to a temperature T2 - was added to the desorption step in containing absorbent comprising the steps of causing the release of CO _2; CO ₂ containing - as a way to capture the CO ₂ from the gas containing stream, wherein T1 is the maximum The LCST of the thermally reactive polymer at the time of CO ₂ loading and the T2 is at least the LCST of the thermally reactive polymer at the time of minimum CO ₂ loading and the CO ₂ absorbent further comprises an amine component that is soluble in the aqueous medium. The use of specific polymers in the present invention in which the amine monomer is dissolved in the aqueous medium at T1 and dispersed through the copolymer in combination with the amine component shows improved total CO ₂ sorption and high absorption rates, Thereby making it possible to use an absorption reactor.