Bipolar membrane stack and method for producing acid and monovalent base from impure salt
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United States of America Patent
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Oct 5, 1993
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N/A
app pub date -
Jun 12, 1991
filing date -
Jun 12, 1991
priority date (Note) -
Expired
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Abstract
A method and bipolar membrane stack for the generation of acid and alkali metal base solutions from an impure salt by electrodialysis. The unit cells of the stack comprise a novel arrangement of cation-selective membranes and an anion selective membrane with relation to a bipolar membrane forming four liquid flow channels. One of the cation-selective membranes is monocation-selective, passing monovalent cations while blocking the passage of multivalent cations. The method is operable continuously using untreated raw material brines contaminated with multivalent cation salts to generate substantially pure alkali metal base solutions.
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