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PROCEDURE FOR THE MANUFACTURE OF L-ASCORBINIC acid BY LACTONISATION OF 2-KETO-L-GULONIC acid OR 2-KETO-L-GULONIC acid esters
PROCEDURE FOR THE MANUFACTURE OF L-ASCORBINIC acid BY LACTONISATION OF 2-KETO-L-GULONIC acid OR 2-KETO-L-GULONIC acid esters
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机译:通过2-酮基-L-古洛糖酸或2-酮基-L-古洛糖酸酯的酯化制备L-抗坏血酸的方法
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摘要
The invention relates to a process for the preparation of L-ascorbic acid, in which free 2-keto-L-gulonic acid or C3-C10-alkyl 2-keto-L-gulonate is lactonized under acidic conditions in the presence of a water-miscible solvent and where this solvent in situ forms a solvent in which the ascorbic acid formed is poorly soluble.
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