Title of Invention	PROCESS FOR PRODUCING 2-HYDROXY -4-METHLY- THIOBUTANOIC ACID
Abstract	A process for producing 2-hydroxy-4- methylthiobutanoic acid is provided wherein 2-hydroxy-4 methylthiobutyronitrile is converted to 2-hydroxy-4 methylthiobutanamide by using sulfuric acid, then adding an aqueous solution containing ammonium bisulfate and ammonium sulfate to the reaction liquid to obtain an oil layer containing 2-hydroxy-4-methylthiobutanoic acid and an aqueous layer containing ammonium bisulfate and ammonium sulfate, then a part of the ammonium salts is separated from the aqueous layer, and the aqueous layer containing ammonium bisulfate and ammonium sulfate thus obtained is recycled as the aqueous solution containing ammonium bisulfate and ammonium sulfate described above. According to the present invention, 2-hydroxy-4-methylthiobutanoic acid of high quality can be obtained without requiring organic solvents and with a greatly reduced amount of waste water.

Title of Invention

PROCESS FOR PRODUCING 2-HYDROXY -4-METHLY- THIOBUTANOIC ACID

Abstract

A process for producing 2-hydroxy-4- methylthiobutanoic acid is provided wherein 2-hydroxy-4 methylthiobutyronitrile is converted to 2-hydroxy-4 methylthiobutanamide by using sulfuric acid, then adding an aqueous solution containing ammonium bisulfate and ammonium sulfate to the reaction liquid to obtain an oil layer containing 2-hydroxy-4-methylthiobutanoic acid and an aqueous layer containing ammonium bisulfate and ammonium sulfate, then a part of the ammonium salts is separated from the aqueous layer, and the aqueous layer containing ammonium bisulfate and ammonium sulfate thus obtained is recycled as the aqueous solution containing ammonium bisulfate and ammonium sulfate described above. According to the present invention, 2-hydroxy-4-methylthiobutanoic acid of high quality can be obtained without requiring organic solvents and with a greatly reduced amount of waste water.

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Patent Number

203283

Indian Patent Application Number

IN/PCT/2001/00690/KOL

PG Journal Number

10/2007

Publication Date

09-Mar-2007

Grant Date

09-Mar-2007

Date of Filing

29-Jun-2001

Name of Patentee

SUMITOMO CHEMICAL COMPANY LIMITED

Applicant Address

5-33, KITAHAMA 4-CHOME, CHUO-KU, OSAKA-SHI, OSAKA 541,

Inventors:

#	Inventor's Name	Inventor's Address
1	IKUDOME, KENJI	20-01-227, HOSHIGOECHO, NIIHAMA-SHI, EHIME 792-0009,
2	SHIOZAKI	509-2, NAKANOKO, SAIJO-SHI, EHIME 793-0054

PCT International Classification Number

C 07C 381/00

PCT International Application Number

PCT/JP00/00542

PCT International Filing date

2000-02-01

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	11/26491	1999-02-03	Japan
2	11/299475	1999-10-21	Japan