Patent ID: 6165436
Filing Date: 2000-12-26
Classification: B01D,C01B

Abstract:
A process for desulfurizing a gaseous feed containing hydrogen sulfide comprising:a) contacting the gaseous feed with a catalytic aqueous solution comprising at least one polyvalent metal chelated by at least one chelating agent, under suitable conditions for oxidation of the hydrogen sulfide to elemental sulfur and concomitant reduction of the polyvalent metal from a higher oxidation level to a lower oxidation level, and recovering a gaseous effluent substantially freed from hydrogen sulfide and, at least reducing an oxidation state of the polyvalent metal of the catalytic aqueous phase which contains the elemental sulfur;b) separating the elemental sulfur from the reduced catalytic aqueous phase by filtering the sulfur at a pressure of at least 1.0 MPa;c) after the separation of the elemental sulfur by filtering, degassing and/or depressurizing at least a portion of the reduced catalytic aqueous phase;d) regenerating the degassed and/or depressurized at least a portion of the reduced catalytic aqueous phase by contact with an oxidizing agent; ande) recycling at least a portion of the regenerated catalytic aqueous phase to contact the gaseous feed.