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US 6,274,744 B1Granted
Preparation of alkali metal salts of L-ascorbic acid
AssigneeBASF SE
InventorsWolfram Burst, Gerd Kaibel, Andreas Böttcher, Veronique Kessler, Thomas Kuntze
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Abstract
A process for preparing alkali metal salts of L-ascorbic acid comprising the following steps: a) esterifying 2-keto-L-gulonic acid or diacetone-2-keto-L-gulonic acid with a C1-C10-alkohol in the presence of an acid catalyst, b) rearranging the resultant 2-keto-L-gulonic acid C1-C10-alkyl ester in the presence of an alkali metal C1-C10-alkoxide, comprises carrying out each of the process steps a) and b) continuously.
Claims17
A process for preparing alkali metal salts of L-ascorbic acid comprising the following steps:
- a) esterifying 2-keto-L-gulonic acid or diacetone-2-keto-L-gulonic acid with a C1-C10-alkohol in the presence of an acid catalyst,
- b) rearranging the 2-keto-L-gulonic acid C1-C10-alkyl ester formed in the presence of an alkali metal C1-C10-alkoxide,
- which comprises carrying out each of the process steps a) and b) continuously.
Dependencies are inferred from the claim text.