Method of electrolysis employing two-chamber ion exchange membrane electrolytic cell having gas diffusion electrode
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United States of America Patent
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Nov 10, 2015
Grant Date -
Mar 1, 2012
app pub date -
Apr 15, 2010
filing date -
Apr 16, 2009
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Abstract
Disclosed is an electrolysis method, whereby sodium chloride concentration of an aqueous caustic soda solution formed through electrolysis in a two-chamber ion-exchange membrane sodium chloride electrolytic cell, which is equipped with a gas diffusion electrode as a cathode and divided into an anode chamber containing an anode and a cathode gas chamber containing the cathode that are partitioned by an ion-exchange membrane, is lowered. In a two-chamber ion-exchange membrane electrolytic cell (1) using a gas diffusion electrode (7), electrolysis is performed while reducing the pressure difference between the liquid pressure in the anode chamber and the gas pressure in the cathode gas chamber, i.e., the pressure calculated by subtracting [oxygen-containing gas pressure in cathode chamber (measured by manometer (18))] or [gas pressure at oxygen-containing gas inlet (14)] from [(liquid pressure in anode chamber applied to ion-exchange membrane when anode chamber is filled up with aqueous sodium chloride solution) being equal to (depth of aqueous sodium chloride solution)(density of aqueous sodium chloride solution)/2].
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