Mitsubishi Gas Chemical Company, Inc.

Satoshi Nanba

Akinori Tanaka

Atsushi Inoue

Masaki Sugita

A method for efficiently separating and collecting an optically active amino acid amide and an optically active amino acid from an aqueous solution containing the optically active amino acid amide and the optically active amino acid includes separating and collecting an optically active amino acid amide from an aqueous solution containing the optically active amino acid amide and an optically active amino acid, utilizing a difference in solubility in an organic solvent between the optically active amino acid amide and the optically active amino acid, without desalting the aqueous solution or after desalting the same, under such a condition that a ratio (C/A) of the total equivalent (C) of cations to the total equivalent (A) of anions contained in the aqueous solution falls within the range from 0.95 to 1.05 when the aqueous solution is not desalted, and the range from 0.5 to 1.5 when the aqueous solution is desalted.

Method of separating and collecting optically active amino acid amide

A method for separately collecting an optically active amino acid amide and an optically active amino acid from an aqueous solution containing same, together with at least one member selected from the group consisting of an acid, a base, and a salt, includes a step of neutralizing an acid or base in the aqueous solution, a desalting step of removing a salt contained in the aqueous solution and/or formed in the neutralization step, and a step of separately collecting the optically active amino acid amide/amino acid separately from the desalted aqueous solution by a process which takes advantage of a difference in solubility between the two components in an organic solvent. The desalting step is preferably performed by electrodialysis, optionally with ammonia added to the aqueous solution. The optically active amino acid amide/amino acid can be separately collected with high efficiency using an organic solvent.

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Niigata, Japan

Satoshi Nanba