Absorbent composition containing a severely-hindered amine mixture with amine salts and/or aminoacid additives for the absorption of H.sub.2 S
First Claim
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1. An absorbent composition comprising:
- (1) a first severely hindered amine with the formula;
##STR7## (2) a second severely hindered amine with the formula;
##STR8## with x being an integer ranging from 2 to 6 and the weight ratio, in the mixture, of the first amine to the second amine ranging from 0.43;
1 to 2.3;
1,(3) and an additive including;
(a) an amine salt, said amine salt being the reaction product of a severely hindered amino compound having a cumulative -Es value greater than 1.75, and a component selected from the group consisting of an acid having at least one pKa of not more than about 7, a decomposable salt of an acid having at least one pKa of not more than 7, a compound capable of forming an acid having a pKa of not more than about 7 and mixtures thereof, said amine salt and said severely hindered amine mixture of (1) and (2) being present in said absorbent composition in a mole ratio of said amine salt to said severely hindered amine mixture of (1) and (2) of at least about 0.2;
1, when said amine salt is present and/or(b) an aminoacid, said aminoacid being a severely hindered aminoacid having a cumulative -Es value greater than 1.75, said aminoacid and said severely hindered amine mixture being present in said absorbent composition in a mole ratio of said aminoacid to said severely hindered amine mixture of at least about 0.01;
1 when said aminoacid is present.
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Abstract
The present invention relates to a new alkaline absorbent solution that reduces the H2 S content in a treated gas to below 10 vppm. The absorbent solution contains two severely-hindered amines, such as bis(tertiarybutylaminoethoxy)-ethane (BTEE) and ethoxyethoxyethanol-tertiarybutylamine (EEETB), a severely hindered amine salt, and/or a severely hindered aminoacid. This invention also describes a process for the removal of H2 S from fluid mixtures using this absorbent solution to produce a very low level of H2 S in the treated fluid. The process is also suitable for the selective removal of H2 S from fluid mixtures comprising H2 S and CO2.
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12 Claims
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1. An absorbent composition comprising:
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(1) a first severely hindered amine with the formula;
##STR7## (2) a second severely hindered amine with the formula;
##STR8## with x being an integer ranging from 2 to 6 and the weight ratio, in the mixture, of the first amine to the second amine ranging from 0.43;
1 to 2.3;
1,(3) and an additive including; (a) an amine salt, said amine salt being the reaction product of a severely hindered amino compound having a cumulative -Es value greater than 1.75, and a component selected from the group consisting of an acid having at least one pKa of not more than about 7, a decomposable salt of an acid having at least one pKa of not more than 7, a compound capable of forming an acid having a pKa of not more than about 7 and mixtures thereof, said amine salt and said severely hindered amine mixture of (1) and (2) being present in said absorbent composition in a mole ratio of said amine salt to said severely hindered amine mixture of (1) and (2) of at least about 0.2;
1, when said amine salt is present and/or(b) an aminoacid, said aminoacid being a severely hindered aminoacid having a cumulative -Es value greater than 1.75, said aminoacid and said severely hindered amine mixture being present in said absorbent composition in a mole ratio of said aminoacid to said severely hindered amine mixture of at least about 0.01;
1 when said aminoacid is present. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification