Global patent index - EP 1000050 A1

EP 1000050 A1 2000-05-17 - 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

EP 1000050 A1 (DE)

Application

EP 98925377 A

Priority

  • CH 9800271 W
  • CH 174897 A
  • CH 1998 A

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 (main, further and additional classification)

C07D 307/62; C07H 7/02; C07H 7/027

IPC 8 full level (invention and additional information)

C07D 307/62 (2006.01); C07H 7/02 (2006.01); C07H 7/027 (2006.01)

CPC (invention and additional information)

C07H 7/027 (2013.01); C07D 307/62 (2013.01); C07H 7/02 (2013.01)

Citation (search report)

See references of WO 9903853A1

Designated contracting state (EPC)

AT CH DE GB LI

EPO simple patent family

WO 9903853 A1 19990128; EP 1000050 A1 20000517

INPADOC legal status

2001-07-04 [18D] DEEMED TO BE WITHDRAWN

- Ref Legal Event Code: 18D

- Effective date: 20001231

2000-05-17 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 20000107

2000-05-17 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): AT CH DE GB LI