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

Low-eutectic solvent catalyst for PET alcoholysis and preparation method thereof

A technology of deep eutectic solvents and catalysts, which is applied in chemical instruments and methods, physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, etc., and can solve the problems of low alcoholysis efficiency of PET

Inactive Publication Date: 2019-03-29
INST OF PROCESS ENG CHINESE ACAD OF SCI
View PDF5 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for preparing a high-efficiency deep eutectic solvent catalyst for alcoholysis of PET, aiming to solve the existing defects of low efficiency of alcoholysis of PET

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
  • Low-eutectic solvent catalyst for PET alcoholysis and preparation method thereof
  • Low-eutectic solvent catalyst for PET alcoholysis and preparation method thereof
  • Low-eutectic solvent catalyst for PET alcoholysis and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0020] Implementation method: Mix 1g of 1,3-dimethylurea and zinc nitrate hexahydrate in a molar ratio of 4:1, heat at 90°C for 2 hours to obtain a clear liquid. 5.0 g of PET granules and 20 g of ethylene glycol were sequentially added into a 50 ml three-necked flask. Control the reaction temperature at 190°C and the pressure at 1 atm, add 0.25g of urea-based eutectic ionic liquid catalyst, condense and reflux for 20 minutes and then cool to room temperature. Then, the BHET monomer and oligomer are separated with water, and the BHET solution is concentrated and crystallized to obtain the BHET monomer. Under this condition, the degradation rate of PET polyester is 100%, and the yield of monomer BHET is 81.41%.

Embodiment 3

[0022] Implementation method: Mix 1g of 1,3-dimethylurea and zinc sulfate heptahydrate at a molar ratio of 10:1, heat at 70°C for 10h, and obtain a clear liquid. 5.0 g of PET granules and 20 g of ethylene glycol were sequentially added into a 50 ml three-necked flask. Control the reaction temperature at 190°C and the pressure at 1 atm, add 0.25g of urea-based eutectic ionic liquid catalyst, condense and reflux for 20 minutes and then cool to room temperature. Then, the BHET monomer and oligomer are separated with water, and the BHET solution is concentrated and crystallized to obtain the BHET monomer. Under this condition, the degradation rate of PET polyester is 100%, and the yield of monomer BHET is 78.69%.

Embodiment 4

[0024] Implementation method: Mix 1g of 1,1-dimethylurea and zinc chloride in a molar ratio of 4:1, heat at 90°C for 2 hours to obtain a clear liquid. 5.0 g of PET granules and 20 g of ethylene glycol were sequentially added into a 50 ml three-necked flask. Control the reaction temperature at 190°C and the pressure at 1 atm, add 0.25g of urea-based eutectic ionic liquid catalyst, condense and reflux for 20 minutes and then cool to room temperature. Then, the BHET monomer and oligomer are separated with water, and the BHET solution is concentrated and crystallized to obtain the BHET monomer. Under this condition, the degradation rate of PET polyester is 100%, and the yield of monomer BHET is 80.57%.

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

No PUM Login to View More

Abstract

The invention belongs to the technical field of macromolecule degradation and catalysis, and relates to a preparation method of a low-eutectic solvent catalyst and application thereof to the PET alcoholysis process. Urea compounds 1,3-dimethylurea, trimethyl-urea and 1,1 dimethylurea are used as hydrogen bond donors of a low-eutectic solvent to perform complexation reaction with inorganic zinc salts and inorganic manganese salts; a metal compounding low-eutectic solvent is formed; the low-eutectic solvent can be used as catalysts to be applied to PET alcoholysis reaction; the advantages of high catalysis activity and high reaction speed are realized; the potential application prospects are realized.

Description

technical field [0001] The invention belongs to the technical field of polymer degradation and catalysis, and relates to a preparation method and application of a deep eutectic solvent catalyst, which is suitable for PET alcoholysis process. Background technique [0002] Polyethylene terephthalate (PET) is obtained by esterification of terephthalic acid (PTA) and ethylene glycol (EG). It has good air tightness, transparency, mechanical properties, and is odorless and non-toxic. Therefore, it is widely used in food packaging, fiber, film and other fields. However, PET is difficult to degrade in the natural environment. The huge consumption has brought about serious environmental pollution and a serious waste of resources. The recycling of waste PET has become a global concern. Now the main chemical recovery methods such as hydrolysis, alcoholysis, and aminolysis have been extensively studied. Due to the advantages of mild reaction conditions and low volatility of reactants,...

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
IPC IPC(8): B01J31/22C07C67/03C07C69/82
CPCB01J31/223C07C67/03C07C69/82
Inventor 张锁江吕兴梅刘博姚浩余周磊晏冬霞
Owner INST OF PROCESS ENG 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