초록

An improved oxidation-reduction process is disclosed that uses a non-aqueous polyvalent metal catalyst system to remove volatile sulfur contaminants from gas streams. In addition to desulfurizing, the process also is useful for decarbonating and dehydrating process gas streams.

대표청구항 ▼

A catalytic oxidation-reduction process for removing sulfur contaminants selected from the group consisting of hydrogen sulfide, carbonyl sulfide and mixtures thereof from a gaseous fluid stream comprising the following steps, in combination, (a) contacting a reactant gaseous stream containing sulfu

A catalytic oxidation-reduction process for removing sulfur contaminants selected from the group consisting of hydrogen sulfide, carbonyl sulfide and mixtures thereof from a gaseous fluid stream comprising the following steps, in combination, (a) contacting a reactant gaseous stream containing sulfur contaminants in a contact zone with a non-aqueous catalyst solution comprising (i) a solvent selected from the group consisting of N-methyl pyrrolidone, N-formylmorpholine, morpholine, dimethyl sulfoxide, sulfolane, dimethyl formamide, propylene carbonate, 1,4-dioxane, 4-hydroxy-4-methyl-2-pentanone, propylene glycol methyl ether, 2-butoxyethanol, 4-methyl-2-pentanone, 2, 4 pentanedione and mixtures thereof, and (ii) a oxidized polyvalent metal chelate catalyst having the following formula: ML3 where L has the formula R1 CO CH2 COR2, where R1 and R2 are selected from group consisting of CH3, C2H5, C6H5, CF3 and C4H3S (thenoyl) and M is a polyvalent metal that exists in more than one oxidation state, to produce a gaseous stream having a reduced sulfur contaminant concentration and an admixture containing solid crystalline sulfur and reduced polyvalent metal chelate catalyst; (b) removing the crystalline sulfur from the process; (c) regenerating the admixture from step (a) by contacting the admixture with an oxidant and producing regenerated polyvalent metal chelate catalyst; (d) removing any water formed or absorbed during processing from the process; and (e) recycling the regenerated polyvalent metal chelate catalyst after water removal back to the contact zone.