Electrolysis of alkali metal salts with hydrogen depolarized anodes
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United States of America Patent
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Dec 31, 1985
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N/A
app pub date -
Jul 30, 1984
filing date -
Jul 30, 1984
priority date (Note) -
Expired
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Abstract
A process for producing sulfuric acid and caustic soda by the electrolysis of an alkali metal sulfate in a membrane cell having a hydrogen depolarized anode. Hydrogen gas in the anode chamber is oxidized to produce hydrogen cations which combine with the sulfate anions from the aqueous alkali metal sulfate solution to produce sulfuric acid. Alkali metal ions are transported across the membrane to the cathode to produce caustic and gaseous hydrogen. By oxidizing hydrogen at the anode, the cell voltage for the electrolysis of the alkali metal sulfate is substantially reduced.
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