Control of thiosulfate in wet desulfurization process solutions

Details Control of thiosulfate in wet desulfurization process solutions Control of thiosulfate in wet desulfurization process solutions

C - Chemistry, Metallurgy

01

B

23/331, 23/344

C01B 17/04 (2006.01) B01D 53/14 (2006.01) B01D 53/52 (2006.01) C01B 17/05 (2006.01) C10K 1/12 (2006.01)

Patent

CA 1130538

d ABSTRACT: CONTROL OF THIOSULFATE IN WET DESULFURIZATION PROCESS SOLUTIONS A method for controlling the concentration of dis- solved thiosulfate byproduct which forms in a wet desulfuri- zation process, by introducing a peroxygen chemical into its recirculating aqueous absorption medium. A peroxy- gen chemical such as aqueous hydrogen peroxide is intro- duced into the recirculating aqueous alkaline absorption medium, preferably after its regeneration, in an amount sufficient to maintain the concentration of thiosulfate byproduct below a saturation concentration. The method is applicable to cyclic wet desulfurization processes, used to recover elemental sulfur from H2S-containing gas streams, in which the absorption medium contains a regen- erable oxidizing agent and is subject to thiosulfate by- product buildup.

349849

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