Granted Patent B2

US 8,500,867 · App. 13/589,169 · 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 (11)

1. A method for the absorption of CO 2 from a gas mixture by contacting the gas mixture with an absorption medium, wherein the absorption medium comprises water and at least one amine of formula (I)

wherein R 1 and R 2 independently of one another are hydrogen or an alkyl moiety with the proviso that R 1 and R 2 are not both hydrogen.

2. The method of claim 1 , wherein the gas mixture is a combustion exhaust gas.

3. The method of claim 1 , wherein the absorption medium is present as one phase after the absorption of CO 2 .

4. The method of claim 1 , wherein the absorption medium comprises water and amines of formula (I) in a weight ratio of from 10:1 to 1:10.

5. The method of claim 1 , wherein the absorption medium comprises at least 5% by weight of amines of formula (I).

6. The method of claim 1 , 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 .

7. The method of claim 6 , 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.

8. The method of claim 6 , 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.

9. The method of claim 1 , wherein said absorption medium further comprises at least one ionic liquid.

10. The method of claim 9 wherein the weight ratio of water and ionic liquid is from 10:1 to 1:1.

Assignments (9)

Priority Claims (1)

Continuity (2)