Title:
PURIFICATION METHOD FOR DIAMINE COMPOUND, NEUTRAL SALT OF DIAMINE COMPOUND, DIAMINE, AND POLYIMIDE
Document Type and Number:
WIPO Patent Application WO/2020/179817
Kind Code:
A1
Abstract:
[Problem] To provide a purification method that enables purification of a diamine compound to which none of purification methods by distillation, sublimation, or recrystallization are applicable, and that, as another purpose of the method, enables provision of a polyimide compound having excellent colorlessness and transparency. [Solution] The purification method for a diamine compound according to the present invention is characterized by comprising: a step for preparing a neutral salt of a diamine compound and dissolving the neutral salt of the diamine compound in a solvent; a step for supplying, to a liquid separation tank, an extraction solvent and the solvent in which the neutral salt of the diamine compound has been dissolved, and bringing these solvents into a phase-separated state; a step for extracting, into the extraction solvent, impurities derived from the diamine compound and contained in the solvent in which the neutral salt of the diamine compound has been dissolved; and a step for causing the neutral salt of the diamine compound dissolved in the solvent to undergo a weak base liberation reaction in the presence of a reducing agent, to obtain a diamine.
Inventors:
FUKUTA SEIJIRO (JP)
MOTOMATSU JOH (JP)
MOTOMATSU JOH (JP)
Application Number:
PCT/JP2020/009122
Publication Date:
September 10, 2020
Filing Date:
March 04, 2020
Export Citation:
Assignee:
TAIYO HOLDINGS CO LTD (JP)
International Classes:
C07C227/40; C07C229/60
Foreign References:
| JP2018118947A | 2018-08-02 | |||
| JP2009545553A | 2009-12-24 | |||
| JP2003026638A | 2003-01-29 | |||
| JP2011026224A | 2011-02-10 |
Attorney, Agent or Firm:
NAKAMURA Yukitaka et al. (JP)
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