Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Alkali metal
Patent
1978-03-06
1979-05-08
Vertiz, O. R.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Alkali metal
423422, 423428, 423437, 423563, 423DIG3, 162 36, C01D 700, C10B 1716, D12C 1102
Patent
active
041536703
ABSTRACT:
A method of treating an aqueous alkali metal sulfide-containing liquor to remove the sulfur values therefrom. Broadly, the method comprises introducing an alkaline liquor containing an alkali metal sulfide into a neutralization zone where it is intimately contacted and reacted with a sufficient amount of a gas containing a major amount of H.sub.2 S and a minor amount of CO.sub.2 to produce a product liquor of reduced alkalinity consisting essentially of a slurry of alkali metal bicarbonate and alkali metal bisulfide. The product liquor is withdrawn from the neutralization zone and introduced into a carbonation zone where it is contacted with a sufficient amount of a CO.sub.2 -containing gas to produce a product stream comprising a slurry of alkali metal bicarbonate crystals substantially free of alkali metal bisulfide and an H.sub.2 S-rich product gas containing a minor amount of CO.sub.2. The H.sub.2 S-rich product gas so produced is recovered, and about 40% to 60% of it is introduced into the neutralization zone. The product stream of alkali metal bicarbonate is thermally decomposed to produce a CO.sub.2 -rich offgas and a solution consisting essentially of alkali metal carbonate. The CO.sub.2 -rich offgas from the thermal decomposition is recovered for introduction into the carbonation zone along with additional CO.sub.2 obtained from a waste gas usually containing less than about 35% CO.sub.2 by volume.
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DeLarvin Clark E.
Humphries L. Lee
Kolin Henry
Rockwell International Corporation
Straub Gary P.
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