Method for purifying gases
View Patent ↗The invention relates to the use of an absorption liquid for purifying gases from gaseous acidic contaminants, the absorption liquid comprising A) 0.1 to 100% by weight of one or more amines of the formula I where R 1 is H, C 1 -C 6 -alkyl, an aromatic radical having 6 to 18 carbon atoms or a radical of the formula 2 R 2 is H, C 1 -C 6 -alkyl, an aromatic radical having 6 to 18 carbon atoms or a radical of the formula 3 R 3 is C 1 -C 6 -alkyl or an aromatic radical having 6 to 18 carbon atoms R 4 is H or CH 3 R 5 is H or CH 3 x is a number from 0 to 3 y is a number from 0 to 3 z is an integer between 1 and 30, and also, if appropriate, B) 0 to 99.9% by weight of water, and/or C) 0 to 99.9% by weight of any desired solvent.
1. A method for purifying a gas comprising gaseous acidic contaminants, said method comprising contacting the gas with an absorption liquid comprising:
A) 0.1 to 100% by weight of one or more amines of the formula 1
where
R 1 is H, C 1 -C 6 -alkyl, an aromatic radical having 6 to 18 carbon atoms or a radical of the formula 2
R 2 is H, C 1 -C 6 -alkyl, an aromatic radical having 6 to 18 carbon atoms or a radical of the formula 3
R 3 is C 1 -C 6 -alkyl or an aromatic radical having 6 to 18 carbon atoms
R 4 is H or CH 3
R 5 is H or CH 3
x is a number from 0 to 3
y is a number from 0 to 3
z is an integer between 1 and 30,
and from 0 to 99.9% by weight of (B) water or from 0 to 99.9% by weight a solvent (C) or mixtures thereof.
2. The method of claim 1 , wherein the constituents A, B and C total 100% by weight.
3. The method of claim 1 , wherein R 1 is —CH 2 CH 2 —(OCH 2 CH 2 ) n -OR 3 .
4. The method of claim 1 , wherein R 2 is H.
5. The method of claim 1 , wherein R 3 is methyl.
6. The method of claim 1 , wherein x=1.
7. The method of claim 1 , wherein y=1.
8. The method of claim 1 , wherein z is an integer between 1 and 4.
9. The method of claim 1 , wherein the gas is a synthesis gas.
10. The method of claim 1 , wherein said contacting occurs at a pressure of 1 to 110 bar and a temperature of 0 to 100° C.
11. A composition comprising
A) 5 to 98% by weight of one or more amines of the formula (1)
where
R 1 is H, C 1 -C 6 -alkyl, or an aromatic radical having 6 to 18 carbon atoms or a radical of the formula (2)
R 2 is H, C 1 -C 6 -alkyl, or an aromatic radical having 6 to 18 carbon atoms or a radical of the formula (3)
R 3 is C 1 -C 6 -alkyl or an aromatic radical having 6 to 18 carbon atoms
R 4 is H or CH 3
R 5 is H or CH 3
x is a number from 0 to 3
y is a number from 0 to 3
z is an integer between 1 and 30,
and also
B) 1 to 12% by weight of water,
and/or
C) 1 to 95% by weight of a solvent.
12. The method of claim 1 , wherein the absorption liquid comprises water in an amount up to 15 weight percent based on the absorption liquid.
13. The method of claim 1 , wherein the absorption liquid comprises solvent in an amount from 1 to 95 weight percent based on the absorption liquid.
14. The method of claim 1 , further comprising regenerating the absorption liquid.
15. The method of claim 14 , wherein the regenerating step includes removal of water.
16. The method of claim 1 , wherein the gaseous acidic contaminants are selected from the group consisting of CO 2 , H 2 S, SO 2 , CS 2 , HCN, COS, lower mercaptans having C 1 to C 8 carbon radicals, and mixtures thereof.