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Removal of hydrogen sulfide from supercritical carbon dioxide

  • US 4,770,862 A
  • Filed: 05/26/1987
  • Issued: 09/13/1988
  • Est. Priority Date: 05/26/1987
  • Status: Expired due to Fees
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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