Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Carbon dioxide or hydrogen sulfide component
Patent
1987-02-19
1988-11-01
Doll, John
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Carbon dioxide or hydrogen sulfide component
423573R, C01B 1702, C01B 1716, C01B 3120
Patent
active
047819014
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 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 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 in contact with the gaseous stream is a mixture containing a higher valence polyvalent metal chelate together with a lower valence polyvalent metal chelate.
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patent: 4368178 (1983-01-01), Diaz
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patent: 4518576 (1985-05-01), Diaz
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Doll John
Freeman Lori S.
The Dow Chemical Company
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