Process for the removal of H2S from a sour H2S-containing gaseous stream

摘要

Process for the removal of HZS from a sour H2S-containing 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 sulphur, the solution comprising an oxidizing polyvalent metal chelate and both phosphate and thiosulphate ions or precursors thereof, and producing a purified gaseous stream and an aqueous solution containing crystalline sulphur and reduced polyvalent metal chelate;(b) removing crystalline sulphur from the aqueous solution and regenerating latter solution in a regenerating zone to produce a regenerated solution containing oxidizing polyvalent metal chelate; and(c) returning the regenerated solution to the contacting zone.