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PROCESS FOR RECOVERING ALKALI METALS AND SULFUR FROM ALKALI METAL SULFIDES AND POLYSULFIDES

United States Patent Application

20170275771
A9
View the Complete Application at the US Patent & Trademark Office
Alkali metals and sulfur may be recovered from alkali monosulfide and polysulfides in an electrolytic process that utilizes an electrolytic cell having an alkali ion conductive membrane. An anolyte includes an alkali monosulfide, an alkali polysulfide, or a mixture thereof and a solvent that dissolves elemental sulfur. A catholyte includes molten alkali metal. Applying an electric current oxidizes sulfide and polysulfide in the anolyte compartment, causes alkali metal ions to pass through the alkali ion conductive membrane to the catholyte compartment, and reduces the alkali metal ions in the catholyte compartment. Liquid sulfur separates from the anolyte and may be recovered. The electrolytic cell is operated at a temperature where the formed alkali metal and sulfur are molten.
Gordon, John Howard (Salt Lake City, UT)
15/ 279,926
September 29, 2016
GOVERNMENT LICENSE RIGHTS [0002] This invention was made with government support under Award No. DE-FE0000408 awarded by the United States Department of Energy. The government has certain rights in the invention.