Title:
METHOD FOR PREPARING DISODIUM TEREPHTHALATE AND HIGH-PURITY HYDROGEN BY ONE-STEP LOW-TEMPERATURE CONVERSION OF PET POLYESTER WASTE PLASTIC
Document Type and Number:
WIPO Patent Application WO/2023/130566
Kind Code:
A1
Abstract:
Provided is a method for preparing disodium terephthalate and high-purity hydrogen by one-step low-temperature conversion of PET polyester waste plastic. The method comprises: directly mixing PET polyester waste plastic with a catalyst according to a certain proportion, adding the mixture to a low-concentration NaOH solution, taking multiple effects of NaOH and directional catalytic characteristics of the catalyst as links, under a specific low-temperature hydrothermal condition, coupling a PET hydrothermal depolymerization reaction to an in-situ reforming reaction of a PET depolymerization product, so that efficient one-step complete conversion of PET in a reaction system is realized, directly obtaining high-purity hydrogen having a purity approximate to 99% and a crude disodium terephthalate solution by a one-step method, and then performing simple refining and crystallization on the crude disodium terephthalate solution to obtain a high-purity disodium terephthalate crystal. High-valued recycling of the PET polyester waste plastic is achieved, the process is simple and ingenious, the energy consumption is low, the industrial application value is extremely high, and secondary pollution to the environment is avoided.
Inventors:
WANG SHU RONG (CN)
SU HONG CAI (CN)
ZHU LING JUN (CN)
LI TIAN (CN)
GAO XIANG (CN)
YAN JIAN HUA (CN)
CEN KE FA (CN)
SU HONG CAI (CN)
ZHU LING JUN (CN)
LI TIAN (CN)
GAO XIANG (CN)
YAN JIAN HUA (CN)
CEN KE FA (CN)
Application Number:
PCT/CN2022/080073
Publication Date:
July 13, 2023
Filing Date:
March 10, 2022
Export Citation:
Assignee:
UNIV ZHEJIANG (CN)
International Classes:
C07C51/083; C01B3/22; C07C63/28
Foreign References:
| CN108863755A | 2018-11-23 | |||
| CN101857198A | 2010-10-13 | |||
| CN106866413A | 2017-06-20 | |||
| CN113401866A | 2021-09-17 | |||
| JP2004277638A | 2004-10-07 |
Attorney, Agent or Firm:
HANGZHOU ZHONGLI INTELLECTUAL PROPERTY AGENCY OFFICE (GENERAL PARTNERSHIP) (CN)
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