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Title:
DIHYDROXY COMPOUND MANUFACTURING METHOD AND RECYCLED RESIN MANUFACTURING METHOD
Document Type and Number:
WIPO Patent Application WO/2023/058599
Kind Code:
A1
Abstract:
Provided is a method for recycling a waste resin composition that contains a synthetic resin and organic impurities.　This method for manufacturing a dihydroxy compound from a waste resin composition includes: a step (a1) for processing an alkaline solution containing water, a first solvent, and a waste resin composition containing a resin having at least two constituent units selected from the group consisting of general formulas (1)-(4) below, and obtaining a reaction solution containing the first solvent and a mixture of a dihydroxy compound containing a first dihydroxy compound selected from the group consisting of general formulas (1')-(4') below and at least one other dihydroxy compound selected from the group consisting of the general formulas (1')-(4') below; and a step (b1) for crystallizing, in the reaction solution, the first dihydroxy compound from a crystallization solution obtained by adding a second solvent. The difference between the solubility of the first dihydroxy compound by the second solvent at 25°C and the solubility of the other dihydroxy compound by the second solvent at 25°C (solubility of other dihydroxy compound - solubility of first dihydroxy compound) is 0.1 g/10 mL or greater.

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Inventors:
KATO NORIYUKI (JP)
NISHIMORI KATSUSHI (JP)
MOTEGI ATSUSHI (JP)
ISHIHARA KENTARO (JP)
MURATA SUZUKI SHOKO (JP)
TAKAMATSU KAZUTAKA (JP)
Application Number:
PCT/JP2022/036961
Publication Date:
April 13, 2023
Filing Date:
October 03, 2022
Export Citation:
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Assignee:
MITSUBISHI GAS CHEMICAL CO (JP)
International Classes:
C08J11/20; C08G64/20
Domestic Patent References:
WO2016052370A12016-04-07
WO2019146507A12019-08-01
WO2021200892A12021-10-07
Foreign References:
JP2015110555A2015-06-18
JP2003171324A2003-06-20
Attorney, Agent or Firm:
KOBAYASHI Hiroshi et al. (JP)
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