Title:
METHOD FOR PRODUCING CRYSTALS OF BIS-2-HYDROXYETHYL TEREPHTHALATE AND APPARATUS FOR PRODUCING CRYSTALS OF BIS-2-HYDROXYETHYL TEREPHTHALATE
Document Type and Number:
WIPO Patent Application WO/2023/277183
Kind Code:
A1
Abstract:
A method for producing crystals of bis-2-hydroxyethyl terephthalate according to the present invention performs: a step in which, with use of a crystallization tank (10) for performing crystallization of an aqueous solution that contains 20 wt% to 30 wt% of BHET and a vacuum generation device (32) that depressurizes the inside of the crystallization tank (10), a slurry (13) that contains crystals of BHET is obtained in the crystallization tank (10) by adiabatically cooling the aqueous solution by means of evaporation of water, which is the solvent of the aqueous solution; and a step in which the crystals of BHET and a mother liquid are obtained by supplying the slurry (13), which has been taken out of the crystallization tank (10), to a solid-liquid separator (20).
Inventors:
NISHIZAWA DAISUKE (JP)
OGAWA AYAKO (JP)
FUJIWARA TAKU (JP)
SUZUKI KENJI (JP)
OGAWA AYAKO (JP)
FUJIWARA TAKU (JP)
SUZUKI KENJI (JP)
Application Number:
PCT/JP2022/026471
Publication Date:
January 05, 2023
Filing Date:
July 01, 2022
Export Citation:
Assignee:
TSUKISHIMA KIKAI CO (JP)
International Classes:
C07C67/52; B01D9/02; C07C69/82
Domestic Patent References:
| WO2006112185A1 | 2006-10-26 | |||
| WO2006112187A1 | 2006-10-26 | |||
| WO2006112186A1 | 2006-10-26 |
Foreign References:
| JP2008088096A | 2008-04-17 | |||
| JP2006272302A | 2006-10-12 | |||
| JP2006272301A | 2006-10-12 | |||
| JP2021109859A | 2021-08-02 | |||
| JP2008088096A | 2008-04-17 |
Attorney, Agent or Firm:
NISHIZAWA Kazuyoshi et al. (JP)
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