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Separation of gas from solvent by membrane technology

  • US 4,995,888 A
  • Filed: 07/05/1988
  • Issued: 02/26/1991
  • Est. Priority Date: 07/05/1988
  • Status: Expired due to Fees
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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