Compositions – Co – s – negative element – or acid – bindant containing – Basis-iron containing
Patent
1992-09-25
1993-06-29
Stoll, Robert L.
Compositions
Co, s, negative element, or acid, bindant containing
Basis-iron containing
423226, 423228, 423223, 4235731, 252190, 252192, C01B 1704
Patent
active
052231739
ABSTRACT:
A method of removing hydrogen sulfide from a sour gaseous stream in a contact zone by contacting the sour gaseous stream with a H.sub.2 S 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 reduced 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 absorbed hydrogen sulfide, hydrosulfide and/or sulfide salts present in the contact zone to sulfur. In a second embodiment, the aqueous alkaline solution and H.sub.2 S selective absorbent in contact with the gaseous stream is a mixture containing a higher valence polyvalent metal chelate together with a lower valence polyvalent metal chelate.
REFERENCES:
patent: 3622273 (1971-11-01), Roberts et al.
patent: 4382918 (1983-05-01), Diaz
patent: 4388293 (1983-06-01), Diaz
patent: 4664902 (1987-05-01), Fong et al.
patent: 5149459 (1992-09-01), Olson et al.
patent: 5149460 (1992-09-01), Olson et al.
Fee Valerie
Stoll Robert L.
The Dow Chemical Company
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