Title:
METHOD FOR IMPROVING HUE OF RECYCLED BIS(2-HYDROXYETHYL) TEREPHTHALATE
Document Type and Number:
Japanese Patent JP2023041608
Kind Code:
A
Abstract:
To provide a method for improving the hue of recycled bis(2-hydroxyethyl) terephthalate.SOLUTION: A method for improving the hue of recycled bis(2-hydroxyethyl) terephthalate is provided, which includes: a step for providing a recycled polyester fabric; a de-polymerization step for using a chemical de-polymerization liquid to chemically depolymerize the recycled polyester fabric to form a de-polymerization product; an evaporation step for distilling out the chemical de-polymerization liquid from the de-polymerization product; an adsorption step for mixing water with the bis(2-hydroxyethyl) terephthalate to form an aqueous phase liquid, and adding an activated carbon material to the aqueous phase liquid to adsorb impurities; and a crystallization step for cooling the aqueous phase liquid to cause bis(2-hydroxyethyl) terephthalate to be deposited as crystal from the aqueous phase liquid, to give the recycled bis(2-hydroxyethyl) terephthalate.SELECTED DRAWING: Figure 1
Inventors:
LIAO TE-CHAO
CHUANG JUNG-JEN
HUANG ZHANG-JIAN
TSENG YU-TI
CHEN CHENG-HSUN
CHUANG JUNG-JEN
HUANG ZHANG-JIAN
TSENG YU-TI
CHEN CHENG-HSUN
Application Number:
JP2022082777A
Publication Date:
March 24, 2023
Filing Date:
May 20, 2022
Export Citation:
Assignee:
NAN YA PLASTICS CORP
International Classes:
C07C67/52; B01D15/00; B01D15/02; B01J20/20; B01J20/28; C07C67/03; C07C67/54; C07C67/56; C07C69/82; C08G63/183; C08G63/91; C08J11/16
Domestic Patent References:
| JP2008088096A | 2008-04-17 | |||
| JP2020176258A | 2020-10-29 | |||
| JP2000053802A | 2000-02-22 |
Foreign References:
| CN109535478A | 2019-03-29 |
Attorney, Agent or Firm:
Patent Attorney Corporation Shuwa Patent Office