Invention Grant
US06617463B2 Method for the production of L-ascorbic acid by lactonization of 2-keto-L-gulonic acid or s2-keto-L-gulonate esters
失效
通过2-酮-L-古洛糖酸或s2-酮-L-古洛糖酸酯的内酯化生产L-抗坏血酸的方法
- Patent Title: Method for the production of L-ascorbic acid by lactonization of 2-keto-L-gulonic acid or s2-keto-L-gulonate esters
- Patent Title (中): 通过2-酮-L-古洛糖酸或s2-酮-L-古洛糖酸酯的内酯化生产L-抗坏血酸的方法
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Application No.: US10275565Application Date: 2002-11-07
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Publication No.: US06617463B2Publication Date: 2003-09-09
- Inventor: Andreas Böttcher , Wolfram Burst
- Applicant: Andreas Böttcher , Wolfram Burst
- Priority: DE10022518 20000510
- Main IPC: C07D30512
- IPC: C07D30512
Abstract:
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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