Title:
光学活性ジアシル酒石酸の回収方法
Document Type and Number:
Japanese Patent JP4392661
Kind Code:
B2
Abstract:
When a salt of an amine and an optically active diacyltartaric acid, or a diastereomer salt of an optically active amine and an optically active diacyltartaric acid, obtained by optically resolving a racemic amine using the optically active diacyltartaric acid, is salt-exchanged with an acid aqueous solution, the optically active diacyltartaric acid is added in the acid aqueous solution beforehand. Furthermore, a raw material containing a racemic amine and an optically active diacyltartaric acid is optically resolved, and the diastereomer salt of the optically active amine and the optically active diacyltartaric acid respectively of one isomer type, is separated. The obtained diastereomer salt is dissociated using an acid aqueous solution containing the optically active diacyltartaric acid, for recovering the optically active diacyltartaric acid, and the obtained' optically active diacyltartaric acid is recycled into an optical resolution step as a raw material of the optical resolution step.
Inventors:
Seiji Morii
Toshihiro Fujino
Haruyo Sato
Toshihiro Fujino
Haruyo Sato
Application Number:
JP2004566292A
Publication Date:
January 06, 2010
Filing Date:
December 22, 2003
Export Citation:
Assignee:
Toray Fine Chemicals Co., Ltd.
International Classes:
C07C67/52; C07C69/76; C07C69/78; C07B57/00
Domestic Patent References:
| JP3072446A | ||||
| JP3223236A | ||||
| JP2002526468A | ||||
| JP9176115A | ||||
| JP2005509011A |
Attorney, Agent or Firm:
Tomonori Iwami