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Method and apparatus for removing H.sub.2 S from a process gas and recovering sulfur

  • US 5,122,351 A
  • Filed: 12/20/1990
  • Issued: 06/16/1992
  • Est. Priority Date: 12/20/1990
  • Status: Expired due to Term
First Claim
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1. In a process for removing H2 S and recovering sulfur from an H2 S-containing process gas wherein the sulfur is melting in a sulfur melting device for separation of sulfur from water including:

  • intimately contacting the process gas with an aqueous polyvalent metal redox solution to absorb the H2 S into the polyvalent metal redox solution, while simultaneously forming a reduced polyvalent metal redox solution, and subsequently oxidizing the reduced polyvalent metal redox solution sufficiently to regenerate the polyvalent metal redox solution, to form an oxygenated polyvalent metal redox solution capable of again absorbing H2 S from said process gas, and to convert dissolved H2 S to elemental sulfur, including the steps of;

    separating the elemental sulfur from a majority of the polyvalent metal redox solution; and

    washing the polyvalent metal redox solution from the sulfur with wash water;

    the improvement comprising;

    recovering the wash water and polyvalent metal redox solution removed from the sulfur for recycle to the process;

    introducing the recovered wash water and the polyvalent metal redox solution removed from the sulfur to an evaporator, to evaporate sufficient wash water therefrom such that the polyvalent metal redox solution remaining in the evaporator is sufficiently concentrated for further absorption of H2 S from the process gas, and removing the evaporated water from the evaporator;

    condensing the evaporated water removed from the evaporator as pure condensed water;

    using the pure condensed water as said wash water for washing the elemental sulfur;

    recovering the polyvalent metal redox solution from the evaporator; and

    recycling the recovered polyvalent metal redox solution for further absorption of H2 S from the process gas.

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