Method of purifying L-ascorbic acid

Details Method of purifying L-ascorbic acid Method of purifying L-ascorbic acid

1986-07-01

1988-08-30

Milestone, Norma S.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D30762

Patent

active

047678704

ABSTRACT:
A method of purifying L-ascorbic acid which comprises: subjecting an acidic aqueous solution of L-ascorbic acid which contains salts of an inorganic acid to electrodialysis to remove the salt therefrom.
The method is in particular useful for removing salts of an inorganic acid from an aqueous mixture of L-ascorbic acid and the inorganic salt resulting from the production of L-ascorbic acid in which diacetone-2-keto-L-gulonic acid or 2-keto-L-gulonic acid is heated in the presence of an inorganic acid, or an alkyl ester of 2-keto-L-gulonic acid is enolized and lactonized in the presence of a base.

REFERENCES:
patent: 2179977 (1939-11-01), Elger
patent: 2265121 (1941-12-01), Reichstein

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