Method of treating alkali metal sulfide and carbonate mixtures

Patent · Sun Jan 01 00:00:00 EST 1978

OSTI ID:863052

Kohl, Arthur L ^[1]; Rennick, Robert D ^[2]; Savinsky, Martin W ^[2]

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1. Woodland Hills, CA
2. Thousand Oaks, CA

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.

• DOE Contract Number: E(49-18)-1529
• Assignee: Rockwell International Corporation (El Segundo, CA)
• Patent Number(s): US 4083930
• OSTI ID: 863052
• Country of Publication: United States
• Language: English

Related Subjects

method
treating
alkali
metal
sulfide
carbonate
mixtures
removing
preferably
recovering
sulfur
values
mixture
comprising
steps
introducing
aqueous
medium
carbonation
zone
reacting
gas
containing
major
amount
minor
resultant
product
step
stripping
maintained
subatmospheric
pressure
contacting
steam
produce
gaseous
water
vapor
liquor
reduced
content
substantially
pure
sufficient
precipitate
bicarbonate
crystals
offgas
thermally
decomposing
alkaline
resultant product
thermally decomposing
major amount
zone maintained
metal sulfide
gas containing
aqueous medium
substantially pure
water vapor
gaseous mixture
alkali metal
atmospheric pressure
mixture comprising
amount sufficient
minor amount
subatmospheric pressure
metal carbonate
pure gaseous
carbonate mixture
metal carbon
sulfur values
treating alkali
/423/162/