Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Alkali metal
Patent
1976-04-02
1978-04-11
Vertiz, O. R.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Alkali metal
423421, 423428, 423563, 423DIG3, 162 36, C01D 700, C01D 1716, D21C 1100
Patent
active
040839303
ABSTRACT:
A method of removing and preferably recovering sulfur values from an alkali metal sulfide and carbonate mixture comprising the steps of (1) introducing the mixture in an aqueous medium into a first carbonation zone and reacting the mixture with a gas containing a major amount of CO.sub.2 and a minor amount of H.sub.2 S; (2) introducing the resultant product from step 1 into a stripping zone maintained at subatmospheric pressure, and contacting this product with steam to produce a gaseous mixture, comprising H.sub.2 S and water vapor, and a liquor of reduced sulfide content; (3) introducing the liquor of reduced sulfide content into a second carbonation zone, and reacting the liquor with substantially pure gaseous CO.sub.2 in an amount sufficient to precipitate bicarbonate crystals and produce an offgas containing CO.sub.2 and H.sub.2 S for use in step 1; (4) recovering the bicarbonate crystals from step 3, and thermally decomposing the crystals to produce an alkaline metal carbonate product and a substantially pure CO.sub.2 offgas for use in step 3.
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Kohl Arthur L.
Rennick Robert D.
Savinsky Martin W.
DeLarvin Clark E.
Humphries L. Lee
Kolin Henry
Rockwell International Corporation
Straub Gary P.
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