Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for controlled degradation and recovery of polyethylene terephthalate material

A technology of polyethylene terephthalate and ethylene phthalate, which is applied in the field of polymer material recycling and resource utilization, can solve the problem of high degradation cost, harsh reaction conditions for PET material degradation, and difficult degradation products. Separation and other problems, to achieve the effect of mild reaction conditions and low reaction cost

Inactive Publication Date: 2017-12-01
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
View PDF21 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of severe degradation reaction conditions of PET materials, high degradation cost, and difficult separation of degradation products, etc.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for controlled degradation and recovery of polyethylene terephthalate material
  • Method for controlled degradation and recovery of polyethylene terephthalate material
  • Method for controlled degradation and recovery of polyethylene terephthalate material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Preparation of ZnCl with a mass fraction of 70% 2 and H 2 Degradation solution composed of O, in which 70g ZnCl 2 , 30g H 2 O. According to the mass ratio of 1:20, 5g of polyethylene terephthalate material (PET bottle) was immersed in the degradation solution and sealed in the reaction kettle. The degradation reaction temperature was 200°C and the reaction time was 8h. After the degradation reaction is completed, cool to room temperature. Then add the diluent ethyl acetate, the mass ratio of ethyl acetate and the degradation product mixture is 2:1, filter and separate to obtain the solid product terephthalic acid, and the liquid product is distilled under reduced pressure to obtain ethylene glycol.

Embodiment 2

[0024] Preparation of ZnCl with a mass fraction of 80% 2 and H 2 Degradation solution composed of O, in which 80g ZnCl 2 , 20g H 2 O. Immerse 4g of polyethylene terephthalate material (PET bottle) in the degradation solution at a mass ratio of 1:25, and seal the mixture in a reaction kettle. The degradation reaction temperature is 180°C and the reaction time is 12 hours. After the degradation reaction is completed, cool to room temperature. Then add diluent diethyl ether, the mass ratio of diethyl ether and degradation product mixture is 5:1, filter and separate to obtain the solid product terephthalic acid, and the liquid product is distilled under reduced pressure to obtain ethylene glycol.

Embodiment 3

[0026] Preparation of FeCl with a mass fraction of 5% 3 and acetic acid degradation solution, in which 5g FeCl 3 , 95g acetic acid. Immerse 10g of polyethylene terephthalate material (PET fiber) in the degradation solution at a mass ratio of 1:10, and seal the mixture in a reaction kettle. The degradation reaction temperature is 260°C and the reaction time is 1h. After the degradation reaction is completed, cool to room temperature. Then add diluent chloroform, the mass ratio of chloroform and degradation product mixture is 3:1, filter and separate to obtain solid product terephthalic acid, and liquid product is obtained ethylene glycol diacetate by vacuum distillation.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
quality scoreaaaaaaaaaa
Login to View More

Abstract

The invention provides a method for controlled degradation and recovery of a polyethylene terephthalate material. The method comprises the following steps: preparing a degradation solution composed of a metal salt and a solvent; dipping the polyethylene terephthalate material in the degradation solution according to a mass ratio of the polyethylene terephthalate material to the degradation solution of 1: 1-100, and sealing the polyethylene terephthalate material to the degradation solution in a reaction vessel; carrying out a degradation reaction at a temperature of 100-260 DEG C for 10 min to 48 h; after completion of the degradation reaction, carrying out cooling to room temperature, and then adding a diluent, wherein a mass ratio of the addition amount of the diluent and a degradation product mixture is 1-5: 1; and carrying out filtering and separating so as to obtain a solid product terephthalic acid or its derivative, and subjecting the liquid product to vacuum distillation so as to obtain ethylene glycol or its derivative. The method provided by the invention has the advantages of mild degradation reaction conditions, low cost and easy separation of degradation products.

Description

technical field [0001] The invention relates to a method for controllable degradation and recovery of polyethylene terephthalate materials, which belongs to the field of recycling and resource utilization of polymer materials. Background technique [0002] Polyethylene terephthalate (PET) is synthesized from dimethyl terephthalate and ethylene glycol through transesterification or esterification of terephthalic acid and ethylene glycol to synthesize terephthalic acid bis Hydroxyethyl ester, and then made by polycondensation reaction. PET is divided into two categories: fiber-grade polyester and non-fiber-grade polyester. Fiber-grade polyester is mainly used to manufacture polyester staple fiber and polyester filament. Non-fiber-grade polyester is mainly used for bottles, films, engineering plastics, etc. Among them, packaging is the largest non-fiber application market for PET, and it is also the fastest growing area for PET demand. In 2014, my country's PET output reached...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C07C27/02C07C51/09C07C63/26C07C29/09C07C31/20C07C67/08C07C67/00C07C69/08C07C69/16C07C69/28C07C29/128C07C67/03C07C67/297C07C69/82
CPCC07C29/095C07C29/1285C07C51/09C07C67/00C07C67/03C07C67/08C07C67/297C07C63/26C07C31/202C07C69/08C07C69/16C07C69/28C07C69/82
Inventor 邓天昇王玉琪张瑶侯相林王英雄齐永琴贾时宇
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com