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. 10, 2012
Filed:
Nov. 06, 2009
Yoshiyuki Koizumi, Ehime, JP;
Akinori Goto, Ehime, JP;
Takushi Azemi, Ehime, JP;
Sumitomo Chemical Company, Limited, Tokyo, JP;
Abstract
A process for producing methionine advantageously in view of cost, while efficiently recovering useful components, is provided, including the following steps (1) hydrolyzing 5-[2-(methylthio)ethyl]imidazolidine-2,4-dione in the presence of a basic potassium compound; (2) introducing carbon dioxide into the reaction solution obtained in step (1) to thereby precipitate methionine, and separating the resulting slurry into a precipitate and a mother liquor; (3) concentrating the mother liquor obtained in step (2), mixing the resulting concentrate with a lower alcohol, introducing carbon dioxide into the resulting mixture to thereby precipitate methionine and potassium hydrogencarbonate, and separating the resulting slurry into a precipitate and a mother liquor; and (4) concentrating the mother liquor obtained in step (3), treating the resulting concentrate by heating at a temperature of from 150 to 200° C., and recycling the treated solution for use in step (3).
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile