Method for producing basic amino acid solution

Abstract

Herein are disclosed a method for producing a basic amino acid solution which comprises subjecting a solution of a basic amino acid salt to electrodialysis with the use of an electrodialyser equipped with cation exchange membranes and anion exchange membranes in combination, wherein an alkali aqueous solution is added to the solution of a basic amino acid salt during the electrodialysis, whereby not only desalting is caused but also the counter anions of the basic amino acid are removed to such degree that the said counter anions remain in an amount of 40 mol % or smaller based on the basic amino acid, as well as a method for producing a basic amino acid solution which comprises subjecting a solution of a basic amino acid salt to electrodialysis with the use of an electrodialyser equipped with anion exchange membrane alone, wherein an alkali aqueous solution is added to the solution of a basic amino acid salt to adjust the pH of the solution to 7 to 10 during the electrodialysis, whereby the counter anions are removed. According to these methods, a basic amino acid solution having a high concentration within the concentration range in which crystals of a basic amino acid salt are not deposited, can be easily provided, by removing the counter anions from a solution of a basic amino acid salt efficiently by use of electrodialysis.

Dependencies are inferred from the claim text.