Multi layer ion exchanging membrane with protected interior hydroxyl ion rejection layer
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United States of America Patent
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Sep 6, 1983
Grant Date -
N/A
app pub date -
Mar 4, 1982
filing date -
Mar 4, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The performance of a permselective cation transporting membrane is improved by making the membrane a three or more layer structure in which the layer having the best hydroxyl (OH) ion rejection characteristic is in the interior of the membrane. The OH ion rejection layer, which typically has sulfonamide or carboxylic functional groups, is covered by a cation transporting layer having sulfonate functional groups to which the cathode electrode is attached by bonding or otherwise. This keeps the high caustic concentrations present at the membrane-electrode interface away from the sulfonamide, etc. rejection layer.
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