Process and composition for the removal of hydrogen sulfide from

Details Process and composition for the removal of hydrogen sulfide from Process and composition for the removal of hydrogen sulfide from

1986-05-01

1988-09-27

Doll, John

Chemistry of inorganic compounds

Sulfur or compound thereof

Elemental sulfur

252191, 252192, B01D 5334, C01B 1705

Patent

active

047740710

ABSTRACT:
A method of 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 about 7 to about 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 salts present in the contact zone to sulfur. In a second embodiment the aqueous alkaline solution contacting the gaseous stream is a mixture containing higher and lower valence polyvalent metal chelates.

REFERENCES:
patent: 4076621 (1978-02-01), Hardison
patent: 4388293 (1983-06-01), Diaz
patent: 4532118 (1985-07-01), Tajiri et al.

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