公开(公告)号：JP2001151765A

公开(公告)日：2001-06-05

申请号：JP2000342489

申请日：2000-11-09

Applicant: BASF AG

Inventor： BURST WOLFRAM ,  KAIBEL GERD DR ,  BOETTCHER ANDREAS ,  KESSLER VERONIQUE ,  KUNTZE THOMAS

IPC: B01D3/32 ,  C07B61/00 ,  C07D307/62

Abstract: PROBLEM TO BE SOLVED: To provide a method for continuously producing an alkali metal salt of L-ascorbic acid at an inexpensive cost of apparatus without causing reduction in yield. SOLUTION: In the case of producing the alkali metal salt of L-ascorbic acid by a method including a process (a) for esterifying 2-keto-L-gluconic acid or diacetone-2-keto-L-gluconic acid with a 1-10C alcohol in the presence of an acid catalyst and a process (b) for rearranging a formed 2-keto-L-gluconic acid 1-10C alkyl ester in the presence of a 1-10C alkali metal alcoholate, the treatment process (a) and the treatment process (b) are continuously carried out.

公开(公告)号：DE19954511A1

公开(公告)日：2001-05-17

申请号：DE19954511

申请日：1999-11-12

Applicant: BASF AG

Inventor： BURST WOLFRAM ,  KAIBEL GERD ,  BOETTCHER ANDREAS ,  KESSLER VERONIQUE ,  KUNTZE THOMAS

IPC: B01D3/32 ,  C07B61/00 ,  C07D307/62

Abstract: Continuous production of alkali metal L-ascorbates (I) comprises: a ) esterifying 2-keto-L-gulonic acid or diacetone 2-keto-L-gulonic acid with a C1-C10 alcohol in the presence of an acid catalyst; and (b) rearranging the resulting ester in the presence of an alkali metal C1-C10 alkoxide.

公开(公告)号：BR0005323A

公开(公告)日：2001-07-03

申请号：BR0005323

申请日：2000-11-09

Applicant: BASF AG

Inventor： BURST WOLFRAM ,  KAIBEL GERD ,  TTCHER ANDREAS B ,  KESSLER VERONIQUE ,  KUNTZE THOMAS

IPC: B01D3/32 ,  C07B61/00 ,  C07D307/62

Abstract: Continuous production of alkali metal L-ascorbates (I) comprises: a ) esterifying 2-keto-L-gulonic acid or diacetone 2-keto-L-gulonic acid with a C1-C10 alcohol in the presence of an acid catalyst; and (b) rearranging the resulting ester in the presence of an alkali metal C1-C10 alkoxide.