Patent ID: 8361426

Claim:
An absorption medium for acid gases which comprises (A) an oligoamine of the general formula (I) in which R 1 is C 1 - to C 3 -alkyl, R 2 is hydrogen or C 1 - to C 3 -alkyl, n is 2 to 6, and p is 1 to 3; and (B) a piperazine derivative of the general formula (II) in which R a is hydrogen, C 1 - to C 3 -alkyl, —CH 2 CH 2 OH or —(CH 2 ) m NH 2 where m is 1 to 3, and R b is hydrogen, C 1 - to C 3 -alkyl or —(CH 2 ) n NH 2 where n is 1 to 3, R c is hydrogen, C 1 - to C 3 -alkyl or —(CH 2 ) o NH 2 where o is 1 to 3, R d is hydrogen, C 1 - to C 3 -alkyl or —(CH 2 ) p NH 2 where p is 1 to 3, and R e is hydrogen, C 1 - to C 3 -alkyl or —(CH 2 ) q NH 2 where q is 1 to 3, wherein the weight ratio of oligoamine (A) to the piperazine derivative (B) m[oligoamine (A)]/m[piperazine derivative (B)] is 0.2 to 4.