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Method of removing hydrogen sulfide from gases utilizing a polyvalent metal chelate of nitrilotriacetic acid and regenerating the solution in a fuel cell

  • US 4,436,713 A
  • Filed: 09/30/1982
  • Issued: 03/13/1984
  • Est. Priority Date: 09/30/1982
  • Status: Expired due to Term
First Claim
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1. A process for the removal of H2 S from a sour gaseous stream comprising(a) contacting the sour gaseous stream in a contacting zone with an aqueous reaction solution at a temperature below the melting point of sulfur, the solution containing an effective amount of an oxidizing polyvalent metal chelate of nitrilotriacetic acid, and mixtures thereof, and producing a sweet gas stream and an aqueous admixture containing crystalline sulfur, hydrogen ions and reduced polyvalent metal chelate or chelates of nitrilotriacetic acid;

  • said contacting zone comprising an anode section of an electrochemical cell, said electrochemical cell also comprising a separate cathode section containing a cathode connected through an external load to the anode, the anode section and cathode section being separated by a hydrogen ion permeable barrier;

    (b) oxidizing reduced polyvalent metal chelate or chelates of nitrilotriacetic acid at the anode in the aqueous reaction solution while concomitantly supplying oxygen to the cathode section and allowing hydrogen ions to migrate to the cathode section, and producing direct current through the load and water at the cathode;

    (c) removing sulfur from the aqueous reaction solution, and water from the cathode section.

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