The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 06, 2009
Filed:
Apr. 06, 2005
Yoshikazu Takamatsu, Kurashiki, JP;
Minoru Yamamoto, Kurashiki, JP;
Yoshinari Sato, Kurashiki, JP;
Asahi Kasei Chemicals Corporation, Tokyo, JP;
Abstract
The present invention provides a method for purifying an amino acid contained in an aqueous solution of alkali metal salt of amino acid comprising the steps of: (1) cation exchanging, which comprises subjecting an aqueous solution of alkali metal salt of amino acid to a desalting purification treatment using a moving bed type continuous ion exchange apparatus comprising a cation exchange resin to obtain an aqueous solution of crude amino acid; and (2) anion exchanging, which comprises adsorbing to a weakly basic anion exchange resin an iminodicarboxylic acid, which is a coexisting by-product, in the resulting aqueous solution of crude amino acid to remove the iminodicarboxylic acid, wherein the aqueous solution of crude amino acid is passed even after adsorbing the iminodicarboxylic acid to the break through point of the weakly basic anion exchange resin.