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Separation of CO.sub.2 and H.sub.2 S from hydrogen containing gas

  • US 4,533,373 A
  • Filed: 06/03/1983
  • Issued: 08/06/1985
  • Est. Priority Date: 12/23/1982
  • Status: Expired due to Fees
First Claim
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1. In a process for the removal of acidic components comprising CO2 and H2 S, from CO2 -rich, hydrocarbon-containing raw gas wherein the raw gas is scrubbed under pressure with a physical scrubbing medium selective for H2 S and COS as compared to CO2 and hydrocarbons, and the resultant loaded scrubbing medium is regenerated and reused, the improvement comprising subjecting dry raw gas to rectification to form a hydrocarbon-rich fraction containing acidic components, as rectification overhead product, and a fraction consisting essentially of acidic components, as rectification bottoms product;

  • scrubbing said rectification overhead product in a first scrubbing column to absorb the acidic components in the physical scrubbing medium to form a first scrubbing column bottoms product;

    vaporizing the rectification bottoms product;

    withdrawing partially loaded scrubbing medium from said first scrubbing column and scrubbing the vaporized rectification bottoms product in a second scrubbing column with said partially loaded scrubbing medium to selectively absorb the sulfur-containing compounds to form a loaded scrubbing medium; and

    discharging resultant scrubbed gas from the second scrubbing column as CO2 overhead product under pressure and essentially free of sulfur compounds.

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