Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for catalyzing and degrading polyethylene glycol terephthalate material

A technology for catalytic degradation of polyethylene terephthalate, applied in chemical instruments and methods, preparation of carboxylic acid esters, preparation of organic compounds, etc., can solve problems such as secondary pollution and difficulty in recycling, and reduce reaction Equipment requirements, the effect of reducing production costs

Inactive Publication Date: 2011-04-20
HARBIN NORMAL UNIVERSITY
View PDF1 Cites 23 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for catalytically degrading polyethylene terephthalate materials, provide a new type of catalyst system for highly efficient catalytic degradation of PET materials, and solve the problem of existing traditional methods for catalytically degrading polyethylene terephthalate. Inorganic catalysts including heavy metals of ethylene glycol formate materials are difficult to recycle, causing secondary pollution problems

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

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0009] Specific embodiment one: this embodiment is the method for catalytic degradation polyethylene terephthalate material, and the method for catalytic degradation polyethylene terephthalate material is realized through the following steps: 1. Weigh polyethylene terephthalate Ethylene terephthalate (PET) material, alkaline functionalized ionic liquid and alcohol solvent, wherein the quality of the alkaline functionalized ionic liquid is 0.5% of polyethylene terephthalate (PET) material ~10%, the mass ratio of alcohol solvent and polyethylene terephthalate (PET) material is 5~15: 1, wherein the cation of described alkaline functionalized ionic liquid is alkylimidazolium cation; Two, will The polyethylene terephthalate (PET) material weighed in step 1, the basic functionalized ionic liquid and the alcohol solvent are put into the reactor, and the reaction is carried out at 140-210°C under normal pressure for 40min- 10h; 3. Separating and recovering the alkaline functionalized ...

specific Embodiment approach 2

[0012] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the structural formula of the cation of the alkaline functionalized ionic liquid described in step one is: where R 1 from C 1 ~C 10 the alkyl chain, R 2 from C 1 ~C 10 the alkyl chain. Other steps and parameters are the same as those in Embodiment 1.

[0013] In this embodiment R 2 The group is obtained by reacting the corresponding halogenated alkanes with alkylimidazoles, and the halogenated hydrocarbons are chlorinated hydrocarbons or brominated hydrocarbons.

specific Embodiment approach 3

[0014] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the quality of the alkaline functionalized ionic liquid in step one is 2% to 9% of the polyethylene terephthalate (PET) material . Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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 relates to a method for catalyzing and degrading a polyethylene glycol terephthalate material, relating to a method for catalyzing and degrading a polyester material. The invention solves the problems of difficult recovery and secondary pollution of the traditional inorganic catalyst including heavy metal for catalyzing and degrading the polyethylene glycol terephthalate material. The method for catalyzing and degrading the polyethylene glycol terephthalate material comprises the following steps of: adding the polyethylene glycol terephthalate material, alkali functional ionic liquid and an alcohol solvent into a reactor; making the mixture react for forty minutes to ten hours under ordinary pressure at the temperature of 140 to 210 DEG C; and then separating and recovering. In the invention, the alkali function ionic liquid is utilized as a catalyst, and the PET (Polyester) material can be catalyzed and degraded under ordinary pressure in the alcohol solvent medium to obtain monomer polyethylene glycol terephthalate. The invention is an efficient and environmental-friendly alcoholysis method for waste PET. The catalyst can be recovered. The conversion rate of the PET material reaches 90% to 100%, and the yield of the monomer polyethylene glycol terephthalate reaches more than 60%.

Description

technical field [0001] The invention relates to a method for catalytically degrading polyester materials. Background technique [0002] Polyethylene terephthalate (PET), a packaging material used in food, beverage, medical and other fields, is a thermoplastic polymer material that becomes waste after a short period of use. With the increasing demand for PET materials in human production and life, the amount of PET waste products is also expanding year by year. According to statistics, in the PET production and processing process, about 5% will become waste, and these wastes together with the packaging waste after one-time use become one of the main components of "white pollution" in nature. PET waste / waste has a large amount of light weight and occupies a large space, and because of the chemical inertness of PET polyester, it is difficult to be degraded by air or microorganisms, which has a great impact on the environment. [0003] The chemical degradation of PET materials...

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): C07C69/82C07C67/317
CPCY02P20/54
Inventor 岳群峰金英学廖志刚李桂春
Owner HARBIN NORMAL UNIVERSITY