Method of removing H.sub.2 S from a gas stream utilizing boron-v

Details Method of removing H.sub.2 S from a gas stream utilizing boron-v Method of removing H.sub.2 S from a gas stream utilizing boron-v

1983-03-31

1984-07-17

Thomas, Earl C.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Carbon dioxide or hydrogen sulfide component

423224, 423226, 423573R, B01D 5334

Patent

active

044605544

ABSTRACT:
A process for removing hydrogen sulfide from sour gas streams is disclosed which is carried out in processing equipment which includes steel components resulting in iron from the steel slowly dissolving in the alkaline H.sub.2 S absorption medium. The solubilized iron tends to react with the hydrogen sulfide to form iron sulfide which further oxidizes to produce sodium thiosulfate. The preferred absorption medium includes a metal vanadate and boron complex, a quinone type reoxidation catalyst and a metal ferri or ferrocyanide decahydrate compound capable of reacting with the solubilized iron in the alkaline absorption medium to form a precipitate which is unreactive with the dissolved hydrogen sulfide.

REFERENCES:
patent: 3035889 (1962-05-01), Nicklin et al.
patent: 3097926 (1963-07-01), Nicklin et al.
patent: 4049776 (1977-09-01), Nicklin et al.
patent: 4400361 (1983-07-01), Shafer
Nicklin et al., "Hydrogen Sulfide Removal by the Stretford Liquid Purification Process", May 1961.

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