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Title: Method of treating alkali metal sulfide and carbonate mixtures

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.

Inventors:
 [1];  [2];  [2]
  1. Woodland Hills, CA
  2. Thousand Oaks, CA
Issue Date:
OSTI Identifier:
863052
Patent Number(s):
4083930
Assignee:
Rockwell International Corporation (El Segundo, CA)
Patent Classifications (CPCs):
C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01B - NON-METALLIC ELEMENTS
C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01D - COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
DOE Contract Number:  
E(49-18)-1529
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
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/

Citation Formats

Kohl, Arthur L, Rennick, Robert D, and Savinsky, Martin W. Method of treating alkali metal sulfide and carbonate mixtures. United States: N. p., 1978. Web.
Kohl, Arthur L, Rennick, Robert D, & Savinsky, Martin W. Method of treating alkali metal sulfide and carbonate mixtures. United States.
Kohl, Arthur L, Rennick, Robert D, and Savinsky, Martin W. Sun . "Method of treating alkali metal sulfide and carbonate mixtures". United States. https://www.osti.gov/servlets/purl/863052.
@article{osti_863052,
title = {Method of treating alkali metal sulfide and carbonate mixtures},
author = {Kohl, Arthur L and Rennick, Robert D and Savinsky, Martin W},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1978},
month = {1}
}

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