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Title: Conversion of alkali metal sulfate to the carbonate

Abstract

A process is described for converting potassium sulfate to potassium carbonate in which a mixture of potassium sulfate and calcium oxide are reacted at a temperature in the range of between about 700/sup 0/C and about 800/sup 0/C with a gaseous mixture having a minor amount of hydrogen and/or carbon monoxide in a diluent with the calcium oxide being present in an amount not greater than about 20 percent by weight of the potassium sulfate to produce an aqueous mixture of potassium sulfide, potassium bisulfide, potassium hydroxide and calcium sulfide and a gaseous mixture of steam and hydrogen sulfide. The potassium and calcium salts are quenched to produce an aqueous slurry of soluble potassium salts and insoluble calcium salts and a gaseous mixture of steam and hydrogen sulfide. The insoluble calcium salts are then separated from the aqueous solution of soluble potassium salts. The calcium salts are dried to produce calcium sulfide, calcium bisulfide and steam, and then, the calcium sulfide and calcium bisulfide are converted to the oxide and recycled. The soluble potassium salts are carbonated to produce potassium carbonate which is concentrated and the precipitated crystals separated. the sulfur-containing compounds are further treated. This process was developed formore » desulfurization and reprocessing of spent seed from open-cycle coal-fired MHD generators for reuse.« less

Inventors:
Issue Date:
OSTI Identifier:
5043575
Assignee:
TIC; ERA-06-000907; EDB-80-123249
DOE Contract Number:  
W-31-109-ENG-38
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; COAL-FIRED MHD GENERATORS; SEED RECOVERY; POTASSIUM SULFATES; DESULFURIZATION; SPENT SEED; REPROCESSING; CHEMICAL REACTIONS; OPEN-CYCLE MHD GENERATORS; POTASSIUM CARBONATES; ALKALI METAL COMPOUNDS; CARBON COMPOUNDS; CARBONATES; DIRECT ENERGY CONVERTERS; MHD GENERATORS; OXYGEN COMPOUNDS; POTASSIUM COMPOUNDS; RECOVERY; SEPARATION PROCESSES; SULFATES; SULFUR COMPOUNDS; 300103* - MHD Generators- Materials, Components, & Auxiliaries

Citation Formats

Sheth, A.C. Conversion of alkali metal sulfate to the carbonate. United States: N. p., 1979. Web.
Sheth, A.C. Conversion of alkali metal sulfate to the carbonate. United States.
Sheth, A.C. Mon . "Conversion of alkali metal sulfate to the carbonate". United States.
@article{osti_5043575,
title = {Conversion of alkali metal sulfate to the carbonate},
author = {Sheth, A.C.},
abstractNote = {A process is described for converting potassium sulfate to potassium carbonate in which a mixture of potassium sulfate and calcium oxide are reacted at a temperature in the range of between about 700/sup 0/C and about 800/sup 0/C with a gaseous mixture having a minor amount of hydrogen and/or carbon monoxide in a diluent with the calcium oxide being present in an amount not greater than about 20 percent by weight of the potassium sulfate to produce an aqueous mixture of potassium sulfide, potassium bisulfide, potassium hydroxide and calcium sulfide and a gaseous mixture of steam and hydrogen sulfide. The potassium and calcium salts are quenched to produce an aqueous slurry of soluble potassium salts and insoluble calcium salts and a gaseous mixture of steam and hydrogen sulfide. The insoluble calcium salts are then separated from the aqueous solution of soluble potassium salts. The calcium salts are dried to produce calcium sulfide, calcium bisulfide and steam, and then, the calcium sulfide and calcium bisulfide are converted to the oxide and recycled. The soluble potassium salts are carbonated to produce potassium carbonate which is concentrated and the precipitated crystals separated. the sulfur-containing compounds are further treated. This process was developed for desulfurization and reprocessing of spent seed from open-cycle coal-fired MHD generators for reuse.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1979},
month = {10}
}