Method for purification of amino acid
US7473801B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 6, 2005 |
| Grant date | Jan 6, 2009 |
| Priority date | — |
| Expiry date | Apr 6, 2025 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C319/28
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.