Patent ID: 8404900

Claim:
An absorbent for separating acidic gases comprising: a compound represented by the Chemical Formula 2; and more than two kinds of compounds selected from the group consisting of compounds represented by the Chemical Formulas 3 to 7, wherein, ‘b’ is an integer from 0 to 3, R 3 is hydrogen or an alkyl group having a carbon number from 1 to 6, R 4 is hydrogen or an alkyl group having a carbon number from 1 to 3, R 5 is hydrogen or an alkyl group having a carbon number from 1 to 3, R 3 and R 5 are not hydrogen at the same time, and R 3 , R 4 and R 5 are not hydrogen at the same time, where, ‘c’ is an integer from 1 to 4 and R 6 is an alkyl group having a carbon number from 1 to 4, wherein, is an integer from 0 to 2, R 7 , R 8 , R 9 , and R 10 , are hydrogen, alkyl groups having a carbon number from 1 to 4, —(CH 2 ) 1 —OH (1=1 to 4) or (CH 2 ) m —NH 2 (m=1 to 4), and X is —CH 2 , —O—, —NH or —S—, wherein, ‘e’ is an integer from 0 or 1 f and g are integers from 0 to 3, and R 11 and R 14 are hydrogen, alkyl groups having a carbon number from 1 to 5, or —(CH 2 ) k —NH 2 (k=0 to 5), Y is —CH 2 , —CHOH, —NH, —O—, or and R 12 and R 13 are hydrogen or methyl groups, wherein, R 15 , R 16 , and R 17 , are alkyl groups having a carbon number from 1 to 4, —(CH 2 ) 1 —OH (1=1˜4) or (CH 2 ) m —NH 2 (m=1 to 4), wherein, R 18 , R 19 , R 20 and R 21 are hydrogen, alkyl groups having a carbon number from 1 to 4, —(CH 2 ) 1 —OH (1=1 to 4) or (CH 2 ) m —NH 2 (m=1 to 4), and R 22 and R 23 are alkyl groups having a carbon number from 1 to 3, —(CH 2 ) 1 —OH (1=1 to 3) or (CH 2 ) m —NH 2 (m=1 to 3), wherein the ratio of the compound represented by the Chemical Formula 3 to the compound represented by the Chemical Formula 2 is 10 to 60 parts by weight to 100 parts by weight, respectively.