Title:
メントールの精製方法
Document Type and Number:
Japanese Patent JP5014846
Kind Code:
B2
Abstract:
Crude menthol is dissolved in nitrile series solvent and then menthol is precipitated by cooling the solution to thereby obtain optically and chemically substantially pure menthol, the enantiomeric excess thereof being more than about 99% e.e. and the chemical purity being more than about 99%. Preferred examples of the nitrile series solvent include acetonitrile and propionitrile. The dissolution of crude menthol is carried out at a temperature below 42° C., which is the melting point of menthol. The cooling temperature in crystallization is preferably at a room temperature or a little lower temperature than the room temperature. After crystallization of menthol, additional purification process such as a distillation may be conducted, if necessary.
Inventors:
Nakayasu Hidetoshi
Yasuhiro Mizuno
Hideyuki Hongo
Yasuhiro Mizuno
Hideyuki Hongo
Application Number:
JP2007069210A
Publication Date:
August 29, 2012
Filing Date:
March 16, 2007
Export Citation:
Assignee:
Takasago International Corporation
International Classes:
C07C29/78; A23L27/12; C07C35/12; C11B9/00; C11B9/02; C07B57/00
Domestic Patent References:
| JP46026933B1 |
Other References:
化学大辞典9,256-257
Attorney, Agent or Firm:
Hiroki Kaneo