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Method for catalytic-degrading polyethylene glycol terephthalate by dithionate

A technology of polyethylene terephthalate and diethylene phthalate, which is used in the preparation of carboxylate, catalysts for physical/chemical processes, organic chemistry, etc. Impurity, affecting the performance of reuse, etc.

Inactive Publication Date: 2010-06-23
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these catalysts can be used to depolymerize waste PET polyester into monomers or chemical raw materials to realize the recycling of PET polyester waste, there are still disadvantages in the above method: the catalyst and the product are not easy to separate
This not only makes the product impure and affects its reuse performance, but also cannot realize the recycling of the catalyst

Method used

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  • Method for catalytic-degrading polyethylene glycol terephthalate by dithionate
  • Method for catalytic-degrading polyethylene glycol terephthalate by dithionate
  • Method for catalytic-degrading polyethylene glycol terephthalate by dithionate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Implementation method: Add 10.0g PET particles, 20.0g ethylene glycol and 0.050g S 2 o 8 2- / ZnO. Control the reaction temperature at 170°C and the pressure at 1 atm, condense and reflux for 4 hours, then cool to room temperature, separate the undegraded PET particles, wash them thoroughly, dry them, and weigh them to obtain the mass of undegraded PET. Under these conditions, the conversion rate of PET polyester is 11.6%, and the yield of BHET is 0.4788%.

Embodiment 2

[0026] Same as Example 1, the reaction temperature is controlled to be 180°C. Under these conditions, the conversion rate of PET polyester is 37.5%, and the yield of BHET is 26.56%.

Embodiment 3

[0028] Same as Example 1, the reaction temperature is controlled to be 190°C. Under these conditions, the conversion rate of PET polyester is 55.6%, and the yield of BHET is 30.69%.

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Abstract

The invention relates to a method for catalytic-degrading polyethylene glycol terephthalate (PET) by dithionate; the method is characterized in that: solid superacid S2O82- / ZnO is used as catalyst, ethylene glycol is used as solvent, and the using amount of the catalyst is 0.01-5.00 percent of the solvent mass, and under the conditions that the reaction temperature is 150-220 DEG C, the pressure is 1atm, and the reaction time is 1-8h, alcoholysis is carried out to the PET polyester. The solid acid catalyst is used in the method, and the method has the advantages of easy separation of products, high selectivity and recycling usage and the like.

Description

Technical field: [0001] The invention relates to the technical field of green and clean catalysis, specifically referring to solid superacid S 2 o 8 2- / ZnO catalyzed alcoholysis method for preparing BHET from polyethylene terephthalate. Background technique: [0002] At present, the output of plastic products in the world has reached hundreds of millions of tons, and the waste plastic products discarded every year have reached 80 million tons, of which the annual waste of PET has also exceeded 200,000 tons. In 2004, the output of plastic products in my country reached more than 17 million tons, of which the annual production capacity of PET polyester was about 6 million tons, while its consumption was still growing at an annual rate of 11%, and its scale was comparable to that of the ethylene industry. As the main raw material of polyester, polyethylene phthalate (PET) polyester is widely used in beverage bottles because of its odorless, tasteless, non-toxic, light weigh...

Claims

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Application Information

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IPC IPC(8): C07C69/80C07C67/00B01J27/053
Inventor 李增喜刘彦轻张锁江王慧张香平
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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