Patent ID: 8518158

Claim:
A solvent composition for selective removal of COS relative to CO 2 from a gas stream containing COS and CO 2 , said composition comprising a) a mixture of N-formylmorpholine and N-acetylmorpholine; 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 R6 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) 9 percent by weight water or less.