Electrochemical methods for recovery of ascorbic acid
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United States of America Patent
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Dec 21, 1999
Grant Date -
N/A
app pub date -
Jun 30, 1998
filing date -
Jun 30, 1997
priority date (Note) -
Expired
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Abstract
The present invention relates to electrochemical methods for the recovery of ascorbic acid from an ascorbate salt without the co-generation of a waste salt stream and while maintaining high conductivity of the electrochemical cell thereby providing for quantitative conversion of the salts to ascorbic in both batch and continuous mode processes. In one embodiment the feed stream comprising an ascorbate salt is dissociated under the influence of an electric field and subjected to water splitting electrodialysis. The ascorbate ion combines with a proton and the salt cation combines with a hydroxyl ion to form ascorbic acid and base, respectively. The feed stream further comprises an inorganic salt which maintains high conductivity in the cell, facilitates quantitative conversion of ascorbate salts to ascorbic acid in both batch and continuous mode processes, and promotes precipitation and crystallization of ascorbic acid as a fine powder. Electrochemical cells useful in the methods include arrangements with a combination of at least one cation membrane, and at least one bipolar membrane in combination with at least one cation membrane.
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