Title:
PROCESS FOR PREPARING FREE 'alpha'-HYDROXY ACIDS FROM AMMONIUM SALTS THEREOF
Document Type and Number:
WIPO Patent Application WO/1997/030962
Kind Code:
A1
Abstract:
A process for preparing 'alpha'-hydroxy acids by heating ammonium salts of 'alpha'-hydroxy acids of general formula (I), removing the formed ammonia and water, adding water to the residue, and heating the obtained mixture, wherein R is hydrogen, C1-C6 alkyl, alkyl(C1-C6)thioalkyl(C1-C6), phenyl or the like. This process is freed from the problem of disposal of by-products such as ammonium bisulfate and makes it possible to prepare a free 'alpha'-hydroxy acid from an ammonium salt thereof economically and in a high yield.
Inventors:
HAYAKAWA KOICHI (JP)
Application Number:
PCT/JP1997/000528
Publication Date:
August 28, 1997
Filing Date:
February 25, 1997
Export Citation:
Assignee:
NIPPON SODA CO (JP)
HAYAKAWA KOICHI (JP)
HAYAKAWA KOICHI (JP)
International Classes:
C07C51/02; C07C319/20; C07C323/52; (IPC1-7): C07C59/01; C07C59/08; C07C59/125; C07C59/50; C07C59/48; C07C51/02; C07C323/52; C07C319/20; C07D207/337; C07D307/54; C07D333/24; C07D213/30
Foreign References:
| JPS54115317A | 1979-09-07 | |||
| JPH07330696A | 1995-12-19 | |||
| JPS63264546A | 1988-11-01 |
Other References:
See also references of EP 0884300A4
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