B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
252/30, 23/345
B01D 53/34 (2006.01) B01D 53/14 (2006.01) C10K 1/10 (2006.01) C10K 1/12 (2006.01)
Patent
CA 1305464
ABSTRACT A process of removing hydrogen sulfide and/or carbon dioxide from a sour gaseous stream in a contact zone by contacting the sour gaseous stream with a H2S- and/or CO2-selective absorbent in an aqueous alkaline solution containing a polyvalent metal chelate at a pH of 7 to 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 H2S- and/or CO2-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, which lower valence polyvalent metal chelate is present in at least about five times the amount of the higher valence polyvalent metal chelant.
559172
Smart & Biggar
The Dow Chemical Company
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