EP 1000050 A1 20000517 - METHOD FOR PRODUCING ASCORBATE
Title (en)
METHOD FOR PRODUCING ASCORBATE
Title (de)
VERFAHREN ZUR HERSTELLUNG VON ASCORBAT
Title (fr)
PROCEDE DE PRODUCTION D'ASCORBATE
Publication
Application
Priority
- CH 9800271 W 19980623
- CH 174897 A 19970716
- CH 1998 A 19980108
Abstract (en)
[origin: WO9903853A1] According to the inventive method, 2-keto-L-gulonic acid is converted to 2-keto-L-gulonic acid ester in a two-stage esterification process, before being further processed to ascorbate. The two-stage esterification enables efficient removal of the water introduced by the starting materials and arising in the reaction from the reaction solution. Said water removal from the reaction balance brings about an increase in esterification yields and a reduction in side products during the lactonization step as a result of the anhydrous ester, thereby economically enabling greater yields and higher purity of the synthesized ascorbate.
IPC 1-7
IPC 8 full level
C07D 307/62 (2006.01); C07H 7/02 (2006.01); C07H 7/027 (2006.01)
CPC (source: EP)
C07D 307/62 (2013.01); C07H 7/02 (2013.01); C07H 7/027 (2013.01)
Citation (search report)
See references of WO 9903853A1
Designated contracting state (EPC)
AT CH DE GB LI
DOCDB simple family (publication)
DOCDB simple family (application)
CH 9800271 W 19980623; EP 98925377 A 19980623