Process for the production of erythorbic acid
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United States of America Patent
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Jan 9, 2001
Grant Date -
N/A
app pub date -
Apr 22, 1999
filing date -
May 31, 1996
priority date (Note) -
Expired
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Abstract
The invention provides a process for the recovery of erythorbic acid from an aqueous feed solution containing values of erythorbic acid at a concentration of less than 0.7 mol/kg, comprising extracting said erythorbic acid with a water-immiscible organic extractant composition comprising at least one secondary or tertiary alkyl amine in which the aggregate number of carbon atoms is at least 20, as a primary extractant, and a polar extraction enhancer compound; wherein said extractant composition comprises at least 2 moles of said polar extraction enhancer compound per one mole of primary extractant; separating said erythorbic acid-containing organic extractant composition from residual aqueous solution, and subjecting said erythorbic acid-containing organic extractant composition to a stripping operation with aqueous solution at a temperature of at least 20.degree. C. higher than the temperature at which said extraction is carried out; whereby there is obtained an aqueous solution of erythorbic acid in which the concentration of erythorbic acid is higher than its concentration in said aqueous feed solution.
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