C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
252/30, 23/344
C09K 3/00 (2006.01) B01D 53/14 (2006.01) B01D 53/52 (2006.01) C10K 1/10 (2006.01)
Patent
CA 1288087
Abstract A process for removing hydrogen sulfide from a gaseous stream in a contact zone by contacting the gaseous stream with an aqueous alkaline scrubbing solution containing a polyvalent metal chelate at a pH of 7 to 10, wherein the polyvalent metal chelate is: in one embodiment, all or substantially all 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 and salts present in the contact zone to sulfur; and in a second embodiment, the aqueous alkaline solution contacting the gaseous stream is a mixture containing higher and lower valence polyvalent metal chelates.
535735
Jeffrey Gaines C.
Myers John D.
Smart & Biggar
The Dow Chemical Company
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