Title:
SEPARATION OF AMMONIUM SULFATE AND AMMONIUM BISULFATE AND PRODUCTION OF 2-HYDROXY-4-METHYLTHIOBUTANOIC ACID USING THE SAME
Document Type and Number:
Japanese Patent JP3804210
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To reduce the amount of sulfuric acid which is a raw material to be used and simultaneously remarkably reduce the amount of generated wastewater in the production of 2-hydroxy-4-methylthiobutanoic acid.
SOLUTION: When 2-hydroxy-4-methylthiobutyronitrile is hydrated and hydrolyzed with sulfuric acid to produce 2-hydroxy-4-methylthiobutanoic acid. In the process, methanol is added to a solution after hydrolysis treatment containing ammonium sulfate and ammonium bisulfate after separating the 2-hydroxy-4-methylthiobutanoic acid to separate the ammonium sulfate and the methanol is further removed to afford an aqueous solution of the ammonium bisulfate, which is then circulated through a hydrating and hydrolyzing step and used together with the sulfuric acid.
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Inventors:
Tetsuya Shiozaki
Kenji Ikudome
Kenji Ikudome
Application Number:
JP24859297A
Publication Date:
August 02, 2006
Filing Date:
September 12, 1997
Export Citation:
Assignee:
Sumitomo Chemical Co., Ltd.
International Classes:
C07C327/06; C01C1/24; C07C319/20; C07C323/52; (IPC1-7): C07C327/06; C01C1/24
Domestic Patent References:
| JP60156396A | ||||
| JP54081210A |
Foreign References:
| US3902859 |
Attorney, Agent or Firm:
Takashi Kuboyama