Method for removing hydrogen sulfide from gas streams

Details Method for removing hydrogen sulfide from gas streams Method for removing hydrogen sulfide from gas streams

C - Chemistry, Metallurgy

01

B

23/331

C01B 17/05 (2006.01)

Patent

CA 1135481

METHOD FOR REMOVING HYDROGEN SULFIDE FROM GAS STREAMS Abstract of the Disclosure The problems of chemical consumption and undesirable formation of sulfur-containing salts inherent in conven- tional processes, such as the Stretford and Takahax processes, for the removal of hydrogen sulfide from gas streams are substantially reduced by the use of a novel, substantially quinone-free washing solution containing solubilized vanadium, thiocyanate ions, a carboxylate complexing agent and one or more water-soluble nonquinone aromatic compounds capable of solubilizing vanadium. Hydrogen sulfide is removed from the hydrogen sulfide- containing gas stream (12) by contact with the washing solution (14). The absorbed hydrogen sulfide is converted to elemental sulfur by reaction with the washing solution. The sulfur is separated (36) and recovered. The washing solution is oxidatively regenerated (24) before being recycled (30) to the absorber (10).

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