Process of making alkali metal tetrathiocarbonates
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United States of America Patent
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Oct 2, 2001
Grant Date -
N/A
app pub date -
Aug 2, 1999
filing date -
Aug 2, 1999
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Expired
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Abstract
Tetrathiocarbonate salt solutions are prepared by dissolving sulfur in carbon disulfide to form a sulfur solution. An alkali metal hydroxide solution is added to the sulfur solution, and an emulsion of the alkali metal hydroxide solution in the sulfur solution is formed. An alkali metal hydrosulfide is added to the emulsion to form the tetrathiocarbonate salt. The process yields tetrathiocarbonate salts in weight ratios up to about 9:1 with respect to trithiocarbonate salts. Aqueous solutions of tetrathiocarbonate salts can be produced in concentrations up to about 56 wt %, i.e., near saturation. The process also enables tetrathiocarbonate salts to be produced at or near atmospheric pressure and at only slightly elevated temperatures.
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