Bipolar membrane stack and method for production of low chloride sodium hydroxide
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United States of America Patent
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May 4, 1993
Grant Date -
N/A
app pub date -
Mar 11, 1991
filing date -
Mar 11, 1991
priority date (Note) -
Expired
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Abstract
A method and bipolar membrane stack for the generation of acid and base solutions from a salt by electrodialysis. The unit cells of the stack comprise a novel arrangement of membranes which provide four liquid flow channels. One of the channels has circulating therein a multivalent acid solution which acts as a buffer and presents leakage of the salt anion through the bipolar membrane, thereby producing base solution of substantially reduced salt-anion contamination. The method can be operated on a continuous basis.
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