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:
Jul. 22, 2008
Filed:
Apr. 22, 2005
Atsushi Inoue, Niigata, JP;
Akinori Tanaka, Niigata, JP;
Satoshi Nanba, Niigata, JP;
Mitsubishi Gas Chemical Company, Inc., Tokyo, JP;
Abstract
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.