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Title: Process for recovering alkali metals and sulfur from alkali metal sulfides and polysulfides

Patent ·
OSTI ID:1490855

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.

Research Organization:
Field Upgrading Limited, Calgary, CA
Sponsoring Organization:
USDOE
DOE Contract Number:
FE0000408
Assignee:
FIELD UPGRADING LIMITED (Calgary, CA)
Patent Number(s):
10,087,538
Application Number:
15/279,926
OSTI ID:
1490855
Resource Relation:
Patent File Date: 2016 Sep 29
Country of Publication:
United States
Language:
English

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