Method and composition for the removal of hydrogen sulfide and c

Details Method and composition for the removal of hydrogen sulfide and c Method and composition for the removal of hydrogen sulfide and c

1988-08-29

1989-10-03

Terapane, John F.

Compositions

Co, s, negative element, or acid, bindant containing

With absorbents

252191, 252192, C09K 300

Patent

active

048714682

ABSTRACT:
A method of removing hydrogen sulfide and carbon dioxide from a sour gaseous stream in a contact zone by contacting the sour gaseous stream with a lean CO.sub.2 -selective absorbent in an aqueous alkaline solution containing a polyvalent metal chelate at a pH of about 7 to about 10 wherein the polyvalent metal chelate is in one embodiment of the invention in the reduce or lower valence state in a contact zone and is oxidized to the oxidized or higher valence state in an oxidation zone so as to convert hydrosulfide and/or sulfide salts present in the contact zone to sulfur. In a second embodiment, the aqueous alkaline solution and CO.sub.2 -selective absorbent contact in the gaseous stream is a mixture containing a minor amount of higher valence polyvalent metal chelate together with a major amount of a lower valence polyvalent metal chelate.

REFERENCES:
patent: 4388293 (1983-06-01), Diaz

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