Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
METHOD FOR PURIFYING L-ASCORBIC ACID
Document Type and Number:
Japanese Patent JPH08176133
Kind Code:
A
Abstract:

PURPOSE: To provide a method for purifying L-ascorbic acid by employing a column chromatography using a strongly acidic cation exchange resin to the aqueous solution of a crude L-ascorbic acid.

CONSTITUTION: This method for purifying L-ascorbic acid comprises e.g. performing a column chromatography using a strongly acidic cation exchange resin of a sulfonated styrene-divinylbenzene copolymer and a simulated moving bed method to the aqueous solution of a crude L-ascorbic acid containing 0.01-50W/V% L-ascorbic acid, 0-10W/V% 2 keto-L-gulonic acid, 3W/V% furoylformic acid and 0-4W/V% sodium chloride. The simulated moving bed method has a characteristic of capable of using plural packed beds, utilizing an adsorbent in a high efficiency comparing with a mono bed method and curtailing the amount of an eluting solution, and is suitable for the treatment of a large amount. Especially, it is suitable for the cases containing 2-keto-L- gulonic acid and is capable of applying as a mother liquid for the crystallization of L-ascorbic acid in the process of a L-ascorbic acid production, and separating and purifying it effectively in a good efficiency.


Inventors:
MAKINO KAORU (JP)
KAWAI KAZUHIRO (JP)
TANIMURA MASATAKE (JP)
TAMURA MASAO (JP)
Application Number:
JP1994000322158
Publication Date:
July 09, 1996
Filing Date:
December 26, 1994
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
TAKEDA CHEMICAL INDUSTRIES LTD (JP)
MITSUBISHI KASEI ENG (JP)
International Classes:
C07D307/62; B01D15/08; B01J39/26; C07B63/00; (IPC1-7): C07D307/62; B01D15/08; B01J39/06; C07B63/00
Attorney, Agent or Firm:
青山 葆 (外1名)