Bipolar membrane electrodialysis of multivalent metal salts whose corresponding base is insoluble
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United States of America Patent
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Dec 17, 2002
Grant Date -
Jan 17, 2002
app pub date -
Jul 10, 2001
filing date -
Jul 13, 2000
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Abstract
Bipolar membrane electrodialysis methods for salt splitting polyvalent metal salts, where the metal cation can form substantially insoluble precipitates in the presence of hydroxyl ions can now be used in recovering acid and base values from a salt streams without precipitates fouling cell operation and causing shutdown. The introduction of an acid to the chamber where metal hydroxides would form inhibits their development or neutralizes formed solids, allowing salt splitting to continue. Salt splitting methods of the invention performed with a three compartment bipolar electrodialysis cell are useful in producing concentrated and purified acid forms, such as 2-keto-L-gluconic acid, H(KLG), a key intermediate in the production of ascorbic acid.
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