| abstract |
The absorption of CO 2 can be greatly accelerated by the addition to absorption media, which contain water and 20 to 60 % by weight of amine as absorption agents, of 0.01 to 0.1 mol/kg of at least one organic salt of a cation, which has a quaternary nitrogen or phosphorus atom and an anion which has a primary or secondary amino group which is bound to a carbon and is not sterically hindered. Suitable substances for this purpose are new organic salts having a cation selected from 1,3-dialkylimidazolium, 2,3-trialkylimidazolinium, 1-hydroxyethyl-2,3-dialkylimidazolinium, 1-alkylamidoalkyl-1,2,3-dialkylimidazolinium, N,N-dialkylpyrrolidinium, N,N-bis(hydroxyalkyl)pyrrolidinium, N-alkylpyridinium and cations of the structures R 4-n N(CH 2 CH 2 OH) n n + and R 4-n N (CH 2 CH(OH)CH 3 ) n + with R = alkyl and n representing from 1 to 3, wherein the alkyl groups can be the same or different and in each case have 1 to 6 carbon atoms and for 1,3-dialkylimidazolium together have a maximum of 7 carbon atoms, and an anion of a beta-aminomonocarboxylic acid or a beta-aminosulphonic acid, wherein for cations of the structure R 4-n N(CH 2 CH 2 OH)n + the anion is a beta-aminomonocarboxylic acid. |