Claims
- 1. A process for removing CO.sub.2 and other acid gases from a normally gaseous mixture, which process comprises:
- (a) contacting the normally gaseous mixture under absorption conditions with an aqueous scrubbing solution comprising:
- (i) one or more alkali metal salts; and
- (ii) as he sole sterically hindered amino compound acid gas absorption promoters, one or more primary sterically hindered aminoacids represented by the formula: ##STR4## wherein R.sub.1 and R.sub.2 are independently selected from CH.sub.3, C.sub.2 H.sub.5, and C.sub.3 H.sub.7 ; R.sub.3 and R.sub.4 are independently selected from hydrogen and CH.sub.3 ; and n is 0, 2 or 3; and
- (b) desorbing at least a portion of the absorbed CO.sub.2 from the solution.
- 2. The process of claim 1 wherein the contacting step is conducted at a temperature ranging from about 25.degree. to 200.degree. C. and at a pressure ranging from about 5 to 2000 psia and the desorption step is conducted by heating the solution to a temperature ranging from about 50.degree. to 150.degree. C. and at a pressure of about 16 to 100 psia.
- 3. The process of claim 2 containing from about 10 to 40 wt. % of said alkali metal salt and from about 2 to 15 wt. % of said aminoacid, the balance being water.
- 4. The process of claim 3 wherein the alkali metal salt is potassium carbonate.
- 5. The process of claim 4 wherein R.sub.1 and R.sub.2 are methyl, and n is 0.
- 6. The process of claim 5 in which the solution also contains a V.sup.+5 corrosion inhibitor.
- 7. A process for removing CO.sub.2 and other acid gases from a normally gaseous mixture, which process comprises:
- (a) contacting the normally gaseous mixture under absorption conditions with an aqueous scrubbing solution comprising of (i) one or more alkali metal salts; and (ii) as the sole sterically hindered amino compound acid gas absorption promoter, 1-amino-cyclopentane carboxylic acid; and
- (b) desorbing at least a portion of the desorbed CO.sub.2 from the solution.
- 8. The process of claim 7 wherein the contacting step is conducted at a temperature ranging from about 25.degree. to 200.degree. C. and at a pressure of about 5 to 2000 psia and the desorption step is conducted by heating the solution to a temperature ranging from about 50.degree. to 150.degree. C. and at a pressure of about 16 to 100 psia.
- 9. The process of claim 8 containing from about 10 to 40 wt. % of said alkali metal salt and from about 2 to 15 wt. % of said aminoacid, the balance being water.
- 10. The process of claim 9 wherein the alkali metal salt is potassium carbonate.
- 11. The process of claim 10 which also contains a V.sup.+5 corrosion inhibitor.
- 12. The process of claim 1 wherein said one or more primary sterically hindered aminoacids includes 1-amino-cyclopentane carboxylic acid.
Parent Case Info
This is a division of application Ser. No. 93,734 filed Sept. 8, 1987 now U.S. Pat. No. 4,759,866 which is a continuation of application Ser. No. 852,322 filed Apr. 15, 1986, now abandoned.
US Referenced Citations (8)
Divisions (1)
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93734 |
Sep 1987 |
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Continuations (1)
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852322 |
Apr 1986 |
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