Granted Patent B2

US 8,500,892 · App. 13/147,198 · Granted Aug 6, 2013

Inventors: Matthias Seiler (Griesheim, DE); Jörn Rolker (Alzenau, DE); Rolf Schneider (Gründau-Rothenbergen, DE); Bernd Glöckler (Rodenbach, DE); Axel Kobus (Langen, DE); Wolfgang Benesch (Bochum, DE); Thomas Riethmann (Essen, DE); Hermann Winkler (Recklinghausen, DE); Jens Reich (Mühlheim an der Ruhr, DE); Helmut Brüggemann (Moers, DE)

Assignee: Evonik Degussa GmbH

Abstract

Claims (21)

1. An absorption medium for the absorption of CO 2 from a gas mixture, comprising water, sulpholane and at least one amine of formula (I)

where R 1 and R 2 independently of one another are hydrogen or an alkyl moiety.

2. The absorption medium of claim 1 , comprising water and sulpholane in a weight ratio of from 10:1 to 1:1.

3. The absorption medium of claim 1 , comprising sulpholane and amines of formula (I) in a weight ratio of from 3:1 to 1:3.

4. The absorption medium of claim 1 , wherein, in formula (I), R 1 and R 2 are hydrogen.

5. The absorption medium of claim 1 , comprising water and amines of formula (I) in a weight ratio of from 10:1 to 1:10.

6. The absorption medium of claim 1 , comprising at least 5% by weight of amines of formula (I).

7. A method for the absorption of CO 2 from a gas mixture by contacting the gas mixture with an absorption medium according to claim 1 .

8. The method of claim 7 , wherein the gas mixture is a combustion exhaust gas.

9. The method of claim 7 , wherein the absorption medium is present as one phase after the absorption of CO 2 .

10. The method of claim 7 , wherein CO 2 absorbed in the absorption medium is desorbed by increasing temperature and/or decreasing pressure and the absorption medium after this desorption of CO 2 is reused for the absorption of CO 2 .

11. The method according of 10 , wherein the absorption is carried out at a temperature in the range from 0 to 70° C. and the desorption at a higher temperature in the range from 50 to 200° C.

12. The method of claim 10 , wherein the absorption is carried out at a pressure in the range from 0.8 to 50 bar and the desorption at a lower pressure in the range from 0.01 to 10 bar.

13. The method of claim 11 , wherein the absorption is carried out at a pressure in the range from 0.8 to 50 bar and the desorption at a lower pressure in the range from 0.01 to 10 bar.

14. A device for separating CO 2 from a gas mixture, said device comprising an absorption unit, a desorption unit and a circulating absorption medium, wherein said absorption medium comprises water, sulpholane and at least one amine of formula (I):

where R 1 and R 2 independently of one another are hydrogen or an alkyl moiety.

15. The device of claim 14 , wherein said absorption medium comprises water and sulpholane in a weight ratio of from 10:1 to 1:1.

16. The device of claim 14 , wherein said absorption medium comprises sulpholane and amines of formula (I) in a weight ratio of from 3:1 to 1:3.

17. The device of claim 14 , wherein, in formula (I), R 1 and R 2 are hydrogen.

18. The device of claim 14 , wherein said absorption medium comprises water and amines of formula (I) in a weight ratio of from 10:1 to 1:10.

19. The device of claim 14 , wherein said absorption medium comprises at least 5% by weight of amines of formula (I).

Assignments (9)

Priority Claims (1)

Continuity (1)