公开(公告)号：US20230167577A1

公开(公告)日：2023-06-01

申请号：US18147198

申请日：2022-12-28

Applicant: NGK Insulators, Ltd.

Inventor： Norimitsu TOHNAI ,  Daiki KATO ,  Yoshio KONDO ,  Kazunari YAMADA

IPC: C30B7/02

CPC classification number: C30B7/02 ,  C07D277/30

Abstract: A refining method according to the present invention is a refining method for crystallizing a compound with at least one crystal form, including setting, as a target wavelength and a target concentration, a specific infrared wavelength and a specific concentration at which a specific crystal form precipitates from a solution of the compound dissolved in a solvent, and using an infrared radiation apparatus capable of emitting infrared radiation including the target wavelength to evaporate the solvent and precipitate the specific crystal form while irradiating a solution of the compound dissolved in the solvent at the target concentration with infrared radiation including the target wavelength.

公开(公告)号：US20230150958A1

公开(公告)日：2023-05-18

申请号：US18147251

申请日：2022-12-28

Applicant: NGK Insulators, Ltd.

Inventor： Norimitsu TOHNAI ,  Daiki KATO ,  Yoshio KONDO ,  Kazunari YAMADA

IPC: C07D277/56 ,  C07C51/43 ,  C07D223/26

CPC classification number: C07D277/56 ,  C07C51/43 ,  C07D223/26 ,  C07B2200/13

Abstract: A refining method according to the present invention is a refining method for crystallizing a compound with at least one crystal form, including setting, as a target wavelength and a target temperature, a specific infrared wavelength and a specific temperature at which a specific crystal form precipitates from a solution of the compound dissolved in a solvent, and using an infrared radiation apparatus capable of emitting infrared radiation including the target wavelength to evaporate the solvent and precipitate the specific crystal form while irradiating the solution with infrared radiation including the target wavelength and adjusting a temperature of the solution to the target temperature.

公开(公告)号：US20230150957A1

公开(公告)日：2023-05-18

申请号：US18147229

申请日：2022-12-28

Applicant: NGK Insulators, Ltd.

Inventor： Norimitsu TOHNAI ,  Daiki KATO ,  Yoshio KONDO ,  Kazunari YAMADA

IPC: C07D277/56 ,  C07C51/43 ,  C07C227/42

CPC classification number: C07D277/56 ,  C07C51/43 ,  C07C227/42 ,  C07B2200/13

Abstract: A refining method according to the present invention is a refining method for crystallizing a compound with at least one crystal form, including: setting, as a target wavelength, a specific infrared wavelength at which a specific crystal form precipitates from a solution of the compound dissolved in a solvent; and using an infrared radiation apparatus capable of emitting infrared radiation including the target wavelength to evaporate the solvent and precipitate the specific crystal form while irradiating the solution with infrared radiation including the target wavelength. The specific infrared wavelength is preferably set as the target wavelength based on an infrared absorption spectrum of the crystal form and the dissolution rate of the compound in the solvent.