Removal of hydrogen sulfide from supercritical carbon dioxide
First Claim
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1. A process for the removal of hydrogen sulfide impurities from a mixture with substantially supercritical carbon dioxide which process comprises contacting substantially supercritical carbon dioxide mixture with a sorbent solution comprising (a) a tertiary amine;
- (b) a physical co-sorbent with a low viscosity of 1 centistoke or less at 120°
F. and low mutual miscibility with substantially supercritical carbon dioxide of less than 1 scf CO2 /lb solvent at 1200 psig and 120°
F.; and
(c) from about 3% to about 10% by weight of water based on the total weight of solvent solution and recovering substantially supercritical carbon dioxide reduced in hydrogen sulfide impurities.
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Abstract
H2 S is removed from substantially supercritical CO2 by contact with a sorbent solution comprising (a) a tertiary amine; (b) particular physical co-sorbent; and (c) 3-10% w water.
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23 Claims
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1. A process for the removal of hydrogen sulfide impurities from a mixture with substantially supercritical carbon dioxide which process comprises contacting substantially supercritical carbon dioxide mixture with a sorbent solution comprising (a) a tertiary amine;
- (b) a physical co-sorbent with a low viscosity of 1 centistoke or less at 120°
F. and low mutual miscibility with substantially supercritical carbon dioxide of less than 1 scf CO2 /lb solvent at 1200 psig and 120°
F.; and
(c) from about 3% to about 10% by weight of water based on the total weight of solvent solution and recovering substantially supercritical carbon dioxide reduced in hydrogen sulfide impurities. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
- (b) a physical co-sorbent with a low viscosity of 1 centistoke or less at 120°
Specification