Thiocyanate to prevent the formation of thiosulfate in the oxida

Details Thiocyanate to prevent the formation of thiosulfate in the oxida Thiocyanate to prevent the formation of thiosulfate in the oxida

1983-10-12

1985-09-17

Thomas, Earl C.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Carbon dioxide or hydrogen sulfide component

423573R, B01D 5334, C01B 1704

Patent

active

045419981

ABSTRACT:
A process is described for preventing the formation of thiosulfate in oxidative hydrogen sulfide scrubbings. For this purpose, an aqueous alkaline scrubbing agent, containing an oxidizing agent, is used, the hydrogen sulfide being absorbed from the scrubbing agent in a scrubbing column and oxidized principally to elementary sulfur with reduction of the oxidizing agent. Subsequently, the scrubbing agent is regenerated for reuse by exposure to an oxygen-containing gas for the reoxidation of the oxidizing agent. A thiocyanate is added to the scrubbing agent, advantageously in a concentration of 0.06 to 0.5 mol/l, preferably 0.3 to 0.4 mol/l.

REFERENCES:
patent: 3972989 (1976-08-01), Fenton et al.
patent: 4017594 (1977-04-01), Fenton et al.
patent: 4325936 (1982-04-01), Gowdy et al.
Kohl et al., "Gas Purification", 3rd Ed., Gulf Publishing Co., Houston, pp. 476-487.

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