Addition of severely-hindered amine salts and/or aminoacids to non-hindered amine solutions for the absorption of H.sub.2 S
First Claim
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1. An absorbent composition comprising:
- (1) MDEA and, optionally, at least one other non-hindered amino compound, and(2) an additive of(a) a severely hindered aminoacid having a cumulative -Es value greater than 1.75, said aminoacid and non-hindered amino compound being present in said absorbent composition in a mole ratio of said aminoacid to said non-hindered hindered amino compound of about 0.01;
1 to 4;
1,(b) an amine salt, said amine salt being the reaction product of an amine selected from the group consisting of severely hindered amino compounds 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 about 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 non-hindered amino compound being present in said absorbent composition in a mole ratio of said amine salt to said non-hindered amino compound of about 0.2;
1 to 4;
1.
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Abstract
A new alkaline absorbent solution containing the additive of a severely-hindered amine salt and/or a severely-hindered aminoacid to a non-hindered amine such as N-methyldiethanolamine (MDEA) is provided. 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 is also provided. The process is also suitable for the selective removal of H2 S from fluid mixtures comprising H2 S and CO2. Use of the above absorbent solution leads to higher selectivity for H2 S than observed when MDEA is used alone without the additives.
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Citations
13 Claims
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1. An absorbent composition comprising:
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(1) MDEA and, optionally, at least one other non-hindered amino compound, and (2) an additive of (a) a severely hindered aminoacid having a cumulative -Es value greater than 1.75, said aminoacid and non-hindered amino compound being present in said absorbent composition in a mole ratio of said aminoacid to said non-hindered hindered amino compound of about 0.01;
1 to 4;
1,(b) an amine salt, said amine salt being the reaction product of an amine selected from the group consisting of severely hindered amino compounds 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 about 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 non-hindered amino compound being present in said absorbent composition in a mole ratio of said amine salt to said non-hindered amino compound of about 0.2;
1 to 4;
1. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification