Patent ID: 8226842

Claim:
A solvent composition for selective removal of COS from a gas stream containing COS and CO 2 with minimal removal of CO 2 from the gas stream, said composition comprising a) 1,3-dimethyl-3,4,5,6-tetrahydro-2(1H)-pyrimidinone; and b) at least one alkanolamine compound of the formula R 3 NHR 4 OR 6 (II) or at least one piperazine compound of formula wherein R 3 is hydrogen, an alkyl group having from 1 to 6 carbon atoms, or the R 4 OH group; R 4 is a branched or unbranched alkylene group having from 1 to 6 carbon atoms; R 5 , independently in each occurrence, is hydrogen or an hydroxyalkyl group having from 1 to 4 carbon atoms; and R 6 is hydrogen, an alkyl group having from 1 to 6 carbon atoms or an hydroxyalkyl group having from 1 to 4 carbon atoms; and c) 8.6 percent by weight or less of water.