METHOD FOR ABSORBING CO2 FROM A GAS MIXTURE

摘要

In a method for absorbing CO2 from a gas mixture, precipitation of a solid during the absorption of CO2 and separation into two liquid phases during the regeneration of an absorption medium can be avoided by using an absorption medium that comprises water and at least one amine of formula (I), wherein * R1 is a group -(CH2) n-(XCH2CH2) m-Y-R3 with * R3 = hydrogen or alkyl group having 1 to 6 carbon atoms, * X and Y are NR3, oxygen, SO, or SO2 independently of each other, wherein for Y = SO and for Y = SO2, R3 is not hydrogen, and wherein Y-R3 can be an N-morpholinyl group or an N-piperazyl group, * n = 2 to 4, * m = 0 to 4, and * R2 is hydrogen, an alkyl group having 1 to 6 carbon atoms, or a group R1, * wherein m is different from 0 if R2 is not a group R1, Y = NR3, and Y-R3 is not an N-morpholinyl group and is not an N-piperazyl group.