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Title:
PURIFICATION METHOD
Document Type and Number:
WIPO Patent Application WO/2022/013919
Kind Code:
A1
Abstract:
The purification method according to the present invention is for selectively obtaining a specific crystal form of a compound having a plurality of crystal forms. Specifically, in an infrared absorption spectrum of a plurality of crystal forms, the infrared wavelength at which the ratio of the absorption rate of a crystal form other than the specific crystal form to the absorption rate of the specific crystal form is 1.3 or more is set as a target wavelength, and the specific crystal form is selectively precipitated by evaporating a solvent while irradiating a solution with infrared rays including the target wavelength by using an infrared emitting device capable of emitting the infrared rays including the target wavelength.

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Inventors:
TOHNAI NORIMITSU (JP)
KATO DAIKI (JP)
KONDO YOSHIO (JP)
YAMADA KAZUNARI (JP)
Application Number:
PCT/JP2020/027256
Publication Date:
January 20, 2022
Filing Date:
July 13, 2020
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Assignee:
NGK INSULATORS LTD (JP)
UNIV OSAKA (JP)
International Classes:
B01D9/02; C07C231/24; C07C233/88; C07D277/56
Domestic Patent References:
WO2018034305A12018-02-22
Foreign References:
JP2012529537A2012-11-22
JP2014189462A2014-10-06
Attorney, Agent or Firm:
ITEC INTERNATIONAL PATENT FIRM (JP)
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