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Title:
METHOD OF PURIFYING AMINO ACID
Document Type and Number:
WIPO Patent Application WO/2005/097734
Kind Code:
A1
Abstract:
A method of isolating a purified amino acid from an aqueous solution of an alkali metal salt of the amino acid, which includes (1) a cation-exchange step in which the aqueous solution of an amino acid alkali metal salt is subjected to a desalting purification treatment with a moving-bed continuous ion exchanger employing a cation-exchange resin to obtain an aqueous solution of a crude amino acid and (2) an anion-exchange step in which an iminodicarboxylic acid which is a coexistent by-product is adsorptively removed from the resultant aqueous solution of a crude amino acid with a weakly basic anion-exchange resin and the aqueous crude-amino-acid solution is kept being passed even after the iminodicarboxylic acid has been adsorbed to the breakthrough point for the weakly basic anion-exchange resin.

Inventors:
TAKAMATSU YOSHIKAZU (JP)
YAMAMOTO MINORU (JP)
SATO YOSHINARI (JP)
Application Number:
PCT/JP2005/006753
Publication Date:
October 20, 2005
Filing Date:
April 06, 2005
Export Citation:
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Assignee:
ASAHI KASEI CHEMICALS CORP (JP)
TAKAMATSU YOSHIKAZU (JP)
YAMAMOTO MINORU (JP)
SATO YOSHINARI (JP)
International Classes:
C07C229/08; C07C229/16; C07C319/28; C07C323/58; C07C227/40; (IPC1-7): C07C227/40; C07C229/08; C07C229/16; C07C319/28; C07C323/58
Foreign References:
JP2003212829A2003-07-30
JPS385104B1
JPH029018B21990-02-28
Other References:
See also references of EP 1734033A4
Attorney, Agent or Firm:
Asamura, Kiyoshi (New Ohtemachi Bldg. 2-1, Ohtemachi 2-chome, Chiyoda-k, Tokyo 04, JP)
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