Process for capturing co2 from a co2-containing gas stream using a thermoresponsive copolymer

Abstract

A process capturing COfrom a CO-containing gas stream, contacting a CO-containing gas stream with a CO-absorbing agent in an absorption step in a vessel with maximum temperature Tresulting in absorption of CO. The COabsorbing agent comprising a polymer dissolved in an aqueous medium, the polymer, a thermoresponsive copolymer, comprising amine monomer distributed through the copolymer, subjecting the CO-containing absorbing agent to a desorption step in a vessel with maximum temperature T, releasing CO, wherein Tis below LCST of the thermoresponsive polymer at maximum COloading, and Tis above LCST of the thermoresponsive polymer at minimum COloading. COabsorbing agent comprises amine component dissolved in the aqueous medium. Use of the specific polymer dissolved in an aqueous medium at T, wherein amine monomer, distributed through the copolymer with an amine component, improves net COsorption and high absorption speed, allowing a relatively small absorption reactor.