REMOVAL OF H2S FROM SOUR GAS STREAM

Japanese Patent JPS6249935

A

Process for the removal of H2S from a sour gaseous stream comprising contacting the sour gaseous stream with aqueous reactant solution in contacting zone (2) at a temperature below the melting point of sulphur, the reactant solution containing solubilized coordination complex of Fe (III) with nitrilotriacetic acid under conditions to convert H2S, producing a gaseous stream having reduced H2S content, and aqueous mixture containing solid sulphur and an increased concentration of solubilized coordination complex of Fe (II) with nitrilotriacetic acid, removing aqueous mixture from the contacting zone (2) and separating a minor portion of the mixture having an increased solid sulphur concentration, heating mixture having an increased sulphur concentration in an at least substantially oxygen free environment (10) to a temperature sufficient to melt the sulphur to produce a solution of solubilized coordination complexes of iron with nitrilotriacetic acid containing molten sulphur, and separating molten sulphur-containing solution in an at least substantially oxygen-free separation zone (12) at a temperature at or above the melting point of sulphur into an upper phase comprising substantially sulphur-free solution of solubilized coordination complexes of non with nitrilotriacetic acid and a lower phase comprising molten sulphur.

HAWAADO RAMUUHOO FUONGU
ZAAIDA DEIAZU
JIYOOJI KONSUTANTEIN BURITASU

JP19412486A

March 04, 1987

August 21, 1986

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SHELL INT RESEARCH

B01D53/52; B01D53/14; B01D53/77; B01J31/22; B01J38/12; C01B17/05; C10G27/10; C10L3/10; (IPC1-7): B01D53/34

Kawahara Kazuho

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