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Disclosed is a formulation for the absorption of CO 2 , which comprises water, at least one CO 2 absorption compound and a carbonic anhydrase as an activator to enhance the absorption capacity of the CO 2 absorption compound. The invention also concerns the use of carbonic anhydrase, in a CO 2 absorption solution to increase the CO 2 absorption rate of such solution.
1. A formulation for the absorption of CO 2 , comprising water and at least one CO 2 absorption compound selected from N-methyldiethanolamine (MDEA), piperazine (PZ), 2-(2-aminoethylamino)ethanol (AEE), diethanolamine (DEA) and 2-amino-2-methyl-1-propanol (AMP), the water and the at least one CO 2 absorption compound forming a solution; and carbonic anhydrase to enhance the absorption of the solution.
2. The formulation of claim 1 , wherein the CO 2 absorption compound comprises AMP.
3. The formulation of claim 1 , wherein the carbonic anhydrase is supported by a support.
4. The formulation of claim 1 , wherein the carbonic anhydrase is immobilised on a support.
5. The formulation of claim 1 , wherein the carbonic anhydrase is a component of the solution.
6. A method to enhance CO 2 absorption in an absorber, comprising:
contacting a gas partially containing CO 2 with an aqueous CO 2 absorption solution comprising at least one CO 2 absorption compound selected from N-methyldiethanolamine (MDEA), piperazine (PZ), 2-(2-aminoethylamino)ethanol (AEE), diethanolamine (DEA) and 2-amino-2-methyl-1-propanol (AMP); and
providing carbonic anhydrase to enhance the absorption of the aqueous CO 2 absorption solution; and
operating the absorber such that the carbonic anhydrase enables an increase in CO 2 transfer rate relative to the same absorption solution without the carbonic anhydrase.
7. The method of claim 6 , wherein the CO 2 absorption compound comprises AMP.
8. The method of claim 6 , wherein the carbonic anhydrase is supported by a support.
9. The method of claim 6 , wherein the carbonic anhydrase is immobilised on a support.
10. The method of claim 6 , wherein the carbonic anhydrase is a component of the solution.
11. A method to enhance CO 2 absorption, comprising:
contacting a gas partially containing CO 2 with an aqueous CO 2 absorption solution in a reactor, the aqueous CO 2 absorption solution comprising at least one secondary or tertiary alkanolamine CO 2 absorption compound;
providing carbonic anhydrase to enhance the absorption of the aqueous CO 2 absorption solution; and
operating the reactor such that the carbonic anhydrase enables an increase in CO 2 transfer rate relative to the same absorption solution without the carbonic anhydrase.
12. The method of claim 11 , wherein the carbonic anhydrase is immobilised on supports.
13. The method of claim 12 , wherein the supports comprise packing within the reactor and the aqueous CO 2 absorption solution flows onto the packing.
14. The method of claim 11 , wherein the carbonic anhydrase is directly present in and flows with the CO 2 absorption solution.
15. The method of claim 14 , wherein the carbonic anhydrase is free in the CO 2 absorption solution.
16. The method of claim 11 , wherein the CO 2 absorption compound comprises a secondary alkanolamine.
17. The method of claim 16 , wherein the CO 2 absorption compound comprises PZ.
18. The method of claim 11 , wherein the CO 2 absorption compound comprises a tertiary alkanolamine.
19. The method of claim 11 , wherein the CO 2 absorption compound comprises MDEA.