Production method for depolymerizing waste polyester fibers through utilizing ethylene glycol method

A technology for the decomposition of waste polyester and ethylene glycol, which is applied in the field of polyester depolymerization and can solve the problems of global environmental burden, space occupation, environmental pollution, etc.

Inactive Publication Date: 2013-09-11
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a polymer material, polyester fiber is widely used in various industries. At the same time, the amount of waste polyester is increasing. If the waste polyester is not recycled, it will not only cause waste of resources, but also bring a lot of harm to the environment. Pollution will also have unnecessary side effects on the polyester industry. Therefore, the recycling of waste polyester has become a major research topic for the development of the current polyester industry.
Although waste polyester does not directly pollute the environment, it is difficult to be degraded by air or microorganisms due to its strong chemical inertness, and will occupy a large amount of space, thus causing a great burden on the earth's environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Mix 200 parts of ethylene glycol with 0.2 parts of zinc acetate, turn on the agitator, set the speed at 150r / min, heat until the zinc acetate is completely dissolved, then add 100 parts of washed waste polyester fiber, and slowly blow in nitrogen , to avoid oxidation reactions. Slowly heat up to 196 ° C, ethylene glycol began to reflux, stop heating after 5 hours of reaction, stirrer and nitrogen continue. The reaction liquid was cooled to 140° C., stirring was stopped and nitrogen was blown. Then, the steps of washing, filtering, and purification were repeated three times to obtain 96 parts of BHET monomer.

Embodiment 2

[0016] Mix 300 parts of ethylene glycol with 0.2 parts of zinc acetate, turn on the agitator, set the speed at 150r / min, heat until the zinc acetate is completely dissolved, then add 100 parts of washed waste polyester fibers, and slowly blow in nitrogen , to avoid oxidation reactions. Slowly heat up to 196 ° C, ethylene glycol began to reflux, stop heating after 5 hours of reaction, stirrer and nitrogen continued. The reaction liquid was cooled to 140° C., stirring was stopped and nitrogen was blown. Then, the steps of washing, filtering, and purification were repeated three times to obtain 96 parts of BHET monomer.

Embodiment 3

[0018] Mix 200 parts of ethylene glycol with 0.3 parts of zinc acetate, turn on the agitator, set the speed at 150r / min, heat until the zinc acetate is completely dissolved, then add 100 parts of washed waste polyester fiber, and slowly blow in nitrogen , to avoid oxidation reactions. Slowly heat up to 196 ° C, ethylene glycol began to reflux, stop heating after 5 hours of reaction, stirrer and nitrogen continued. The reaction liquid was cooled to 140° C., stirring was stopped and nitrogen was blown. Then, the steps of washing, filtering, and purification were repeated three times to obtain 96 parts of BHET monomer.

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Abstract

The invention discloses a production method for depolymerizing waste polyester fibers through utilizing an ethylene glycol method, and relates to the fields of polyester depolymerizing technologies, high polymer material depolymerizing and the like. The method comprises steps of: utilizing an ethylene glycol alcoholytic method to depolymerize waste polyester fibers, adopting zinc acetate as a catalyst and the ethylene glycol as an alcoholytic agent, and then carrying out a plurality of times of washing, crystallizing and purifying so as to obtain terephthalate (BHET).

Description

technical field [0001] The method of depolymerizing waste polyester fibers by ethylene glycol method specifically relates to the method of using ethylene glycol as an alcoholysis agent and zinc acetate as a catalyst to degrade polyester fibers by heating, and then distilling and crystallizing the product, which belongs to the technical field of polyester depolymerization . Background technique [0002] At present, the polyester industry continues to grow and develop, and the amount of polyester is also increasing. Polyester fiber is widely used in various industries as a polymer material. At the same time, the amount of waste polyester is increasing. If the waste polyester is not recycled, it will not only cause waste of resources, but also bring a lot of harm to the environment. Pollution will also have unnecessary side effects on the polyester industry. Therefore, the recycling of waste polyester has become a major research topic for the development of the polyester indus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/24C07C69/82C07C67/00
CPCY02W30/62
Inventor 余天石葛明桥张文彩
Owner JIANGNAN UNIV
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