Oxidative removal of hydrogen sulfide from gaseous streams

Details Oxidative removal of hydrogen sulfide from gaseous streams Oxidative removal of hydrogen sulfide from gaseous streams

1979-11-07

1981-07-14

Thomas, Earl C.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Carbon dioxide or hydrogen sulfide component

423224, 423228, 423573G, B01D 5334

Patent

active

042786460

ABSTRACT:
Hydrogen sulfide is removed from a gaseous stream by contacting the stream with an aqueous solution of ferric ion chelated with an aminopolycarboxylic acid at a pH of 3.5 to 5, whereby hydrogen sulfide is oxidized to elemental sulfur and chelated ferric ion is reduced to chelated ferrous ion. The solution also contains ammonia or an aliphatic, alicyclic, or heterocyclic primary or secondary amine in a sufficient proportion to maintain chelated ferrous ion in solution at a pH of 3.5 to 5. The chelated ferric ion is regenerated by contacting the solution with a gas containing elemental oxygen.

REFERENCES:
patent: 3068065 (1962-12-01), Hartley et al.
patent: 4009251 (1977-02-01), Meuly
patent: 4036942 (1977-07-01), Sibeud et al.
Smith, "The Sequestration of Metals", Chapman & Hall, Ltd., London, 1959, p. 23.

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