Separation of gas from solvent by membrane technology
First Claim
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1. The method of separating a charge rich liquid containing gas dissolved in solvent therefor which comprisesmaintaining said charge rich liquid containing gas dissolved in solvent therefore in liquid phase in contact with a gas-permeable, essentially solvent impermeable membrane of pore size of less than about 1000 A and molecular weight cutoff of below about 1,000 selected from the group consisting of cellulose acetate membrane, hydrolyzed cellulose membrane, and polyethyleneimine membrane, and;
- maintaining a pressure drop across said gas-permeable essentially solvent-impermeable membrane;
passing said gas from the charge rich liquid containing gas dissolved in solvent therefore at the higher pressure side of said membrane through said membrane thereby forming lean liquid containing decreased quantities of gas dissolved in solvent on the higher pressure side of said membrane and, on the lower pressure side of said membrane, gas containing decreased quantities of liquid;
recovering lean liquid containing decreased quantities of gas dissolved in solvent from the high pressure side of said membrane; and
recovering gas containing decreased quantities of liquid from the lower pressure side of said membrane.
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Abstract
Hydrogen sulfide is separated from the dimethyl ether of tetraethylene glycol through a membrane of hydrolyzed cellulose.
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Citations
10 Claims
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1. The method of separating a charge rich liquid containing gas dissolved in solvent therefor which comprises
maintaining said charge rich liquid containing gas dissolved in solvent therefore in liquid phase in contact with a gas-permeable, essentially solvent impermeable membrane of pore size of less than about 1000 A and molecular weight cutoff of below about 1,000 selected from the group consisting of cellulose acetate membrane, hydrolyzed cellulose membrane, and polyethyleneimine membrane, and; -
maintaining a pressure drop across said gas-permeable essentially solvent-impermeable membrane; passing said gas from the charge rich liquid containing gas dissolved in solvent therefore at the higher pressure side of said membrane through said membrane thereby forming lean liquid containing decreased quantities of gas dissolved in solvent on the higher pressure side of said membrane and, on the lower pressure side of said membrane, gas containing decreased quantities of liquid; recovering lean liquid containing decreased quantities of gas dissolved in solvent from the high pressure side of said membrane; and recovering gas containing decreased quantities of liquid from the lower pressure side of said membrane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. The method of separating a charge rich liquid containing hydrogen sulfide gas dissolved in dimethyl ether of tetraethylene glycol solvent which comprises
maintaining said charge rich liquid containing hydrogen sulfide gas dissolved in dimethyl ether of tetraethylene glycol solvent in contact with a gas-permeable, essentially solvent impermeable, hydrolyzed cellulose acetate membrane of pore size of about 0.1-1000 A and molecular weight cutoff of less than about 1000; -
maintaining a pressure drop across said membrane of about 200-500 psig; passing hydrogen sulfide from the charge rich liquid containing hydrogen sulfide dissolved therein at the higher pressure side of said membrane through said membrane thereby forming lean liquid containing decreased quantities of hydrogen sulfide on the higher pressure side of said membrane and on the lower pressure side of said membrane, gas containing decreased quantities of liquid; recovering lean liquid containing decreased quantities of hydrogen sulfide from the high pressure side of said membrane; and recovering hydrogen sulfide containing decreased quantities of liquid from the lower pressure side of said membrane.
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Specification