Title:
METHOD FOR PRODUCING HIGH-PURITY BIS(2-HYDROXYETHYL) TEREPHTHALATE, REGENERATED POLY(ETHYLENE TEREPHTHALATE), DECOLORING SOLVENT, AND METHOD FOR PURIFYING BIS(2-HYDROXYETHYL) TEREPHTHALATE
Document Type and Number:
WIPO Patent Application WO/2022/003990
Kind Code:
A1
Abstract:
[Problem] To provide a method for producing high-purity bis(2-hydroxyethyl) terephthalate (BHET), by which high-purity BHET can be easily produced from colored polyester waste. [Solution] A method for producing high-purity BHET according to the present invention comprises: a depolymerization step in which colored polyester waste is depolymerized to obtain a depolymerization product including colored crude BHET; a concentration step in which low-boiling ingredients contained in the depolymerization product are removed to concentrate the BHET; a recovery step in which the BHET is recovered from the crude BHET to obtain medium-purity BHET; a crystallization separation step in which the medium-purity BHET is subjected to crystallization in a decoloring solvent and the crystals are separated, by solid-liquid separation, from the colorant-containing solvent ingredient, thereby obtaining purified BHET; and a solvent removal step in which the solvent remaining in the crystals of the purified BHET is removed to obtain high-purity BHET.
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Inventors:
TAKAO MASAKI (JP)
SAKAI TORU (JP)
FUJITA HIROSHI (JP)
INADA SHUJI (JP)
SAKAI TORU (JP)
FUJITA HIROSHI (JP)
INADA SHUJI (JP)
Application Number:
PCT/JP2020/029418
Publication Date:
January 06, 2022
Filing Date:
July 31, 2020
Export Citation:
Assignee:
SHINTECH CORP (JP)
JEPLAN INC (JP)
JEPLAN INC (JP)
International Classes:
C07C67/52; C08J11/16; C07C67/54; C07C69/82
Domestic Patent References:
| WO2007018161A1 | 2007-02-15 |
Foreign References:
| JP2006232701A | 2006-09-07 | |||
| JP2008088096A | 2008-04-17 | |||
| JP2005255963A | 2005-09-22 | |||
| US3652649A | 1972-03-28 | |||
| US3268575A | 1966-08-23 |
Attorney, Agent or Firm:
IPX PATENT PARTNERS (JP)
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