Title:
METHOD FOR PRODUCING BIS-(2-HYDROXYETHYL)TEREPHTHALATE AND METHOD FOR PRODUCING RECYCLED POLYETHYLENE TEREPHTHALATE
Document Type and Number:
WIPO Patent Application WO/2023/203980
Kind Code:
A1
Abstract:
[Problem] To provide: a method for producing BHET, by which BHET can be produced in a simple manner from PE waste materials; and a method for producing recycled PET using said BHET as a raw material. [Solution] One embodiment of the present invention provides a method for producing BHET. This production method includes: a depolymerization step for mixing PE waste materials, MEG and a depolymerization catalyst, and depolymerizing the PE waste materials to obtain a depolymerization product containing crude BHET; a washing step for cooling the depolymerization product, adding a washing medium that is different from MEG, and transferring at least some impurities other than PE contained in the depolymerization product to the washing medium so as to remove these impurities from the depolymerization product; a concentration step for removing low boiling point components containing at least the washing medium from the washed depolymerization product so as to concentrate the crude BHET; and a recovery step for recovering BHET from the concentrated crude BHET by means of distillation so as to obtain high purity BHET having a higher purity than the crude BHET.
More Like This:
Inventors:
TAKAO MASAKI (JP)
YAMAHARA KEI (JP)
INADA SHUJI (JP)
FUJITA HIROSHI (JP)
YAMAHARA KEI (JP)
INADA SHUJI (JP)
FUJITA HIROSHI (JP)
Application Number:
PCT/JP2023/012739
Publication Date:
October 26, 2023
Filing Date:
March 29, 2023
Export Citation:
Assignee:
SHINTECH CORP (JP)
JEPLAN INC (JP)
JEPLAN INC (JP)
International Classes:
C08G63/16; C07C67/52; C07C67/54; C07C69/82; C08J11/24
Domestic Patent References:
| WO2022004359A1 | 2022-01-06 |
Foreign References:
| JP2010185077A | 2010-08-26 | |||
| JP2006131698A | 2006-05-25 | |||
| JP2020050689A | 2020-04-02 | |||
| JP2021191872A | 2021-12-16 |
Attorney, Agent or Firm:
IPX PATENT PARTNERS (JP)
Download PDF: