PROCESS FOR PRODUCTION OF METHIONINE

Title:

PROCESS FOR PRODUCTION OF METHIONINE

Document Type and Number:

WIPO Patent Application WO/2003/045904

Kind Code:

A1

Abstract:

The invention aims at providing a process by which high-quality crystals of methionine in the form of granules or thick plates having high bulk density can be stably produced. The aim can be attained by a process for production of methionine which comprises the step of hydrolyzing 5-(2- methylmercaptoethyl)hydantoin into a metal salt of methionine by the use of at least one metal compound selected from the group consisting of metal hydroxides, metal carbonates, and metal bicarbonates, the step of neutralizing the metal salt of methionine under pressurizing with carbon dioxide to crystallize methionine, the step of separating the resulting mixture into methionine and a filtrate, and the step of recycling the filtrate to the step of hydrolysis of 5-(2-methylmercaptoethyl)- hydantoin, wherein the content of methionine polymers and/or salts thereof in the aqueous solution used in the crystallization step in terms of methionine polymers is adjusted to 8 wt % or below based on the amount of methionine to be formed.

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Inventors:

KAWABE TORU (JP)
OKUBO TOSHIMICHI (JP)
UMEZAWA TADASHI (JP)
SATO MASAYUKI (JP)
KOGA TAKEOMI (JP)

Application Number:

PCT/JP2002/012425

Publication Date:

June 05, 2003

Filing Date:

November 28, 2002

Export Citation:

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Assignee:

NIPPON SODA CO (JP)
KAWABE TORU (JP)
OKUBO TOSHIMICHI (JP)
UMEZAWA TADASHI (JP)
SATO MASAYUKI (JP)
KOGA TAKEOMI (JP)

International Classes:

C07C319/20; C07C319/28; C07C323/58; (IPC1-7): C07C319/28

Foreign References:

JP2001072656A	2001-03-21
JPH11158140A	1999-06-15
JPH04193861A	1992-07-13

Other References: