Process for the desulfurization of a crude gas containing H.sub.2 S

  • US 5,628,977 A
  • Filed: 05/26/1995
  • Issued: 05/13/1997
  • Est. Priority Date: 11/26/1992
  • Status: Expired due to Term
First Claim
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1. In a process for the desulfurization of a crude gas stream containing at least hydrogen sulfide comprising the steps:

  • passing said crude gas stream to a Claus plant to produce elemental sulfur and a waste gas;

    subjecting the Claus waste gas to a combustion zone to form sulfur dioxide;

    scrubbing the waste gas from the combustion zone to recover sulfur dioxide, andrecycling the sulfur dioxide recovered from the scrubbing, wherein the improvement comprises;

    splitting the crude gas stream into two portions;

    directly supplying the first portion of the crude gas stream into either a Claus furnace or a direct oxidation Claus plant and separating the sulfur from the Claus off-gas;

    supplying the residual Claus off-gas and the second portion of the crude gas stream to a combustion zone to oxidize the sulfur and sulfur compounds within the gases into sulfur dioxide;

    supplying the combustion zone off-gas to a scrubbing zone where a physical sorbent separates the sulfur dioxide out of the combustion zone off-gas;

    venting the sulfur dioxide-depleted gas from the scrubbing zone;

    separating the sulfur dioxide from the physical sorbent, andmixing the separated sulfur dioxide with the first portion of the crude gas stream.

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