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Recycling method for catalytic degradation of waste PET

A catalyst and degradation reaction technology, applied in the field of catalytic degradation of waste PET recycling, can solve the problems of high cost and high cost of separation series equipment, and achieve the effects of shortening production cycle, improving production efficiency and reducing production cost

Inactive Publication Date: 2015-07-15
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

However, DMT cannot be directly used in the TPA-based PET manufacturing process, and must be further converted into TPA before it can be used
And the product will contain more derivatives, and the separation series equipment required for the classification and purification of these substances is relatively expensive and expensive

Method used

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  • Recycling method for catalytic degradation of waste PET
  • Recycling method for catalytic degradation of waste PET

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] In the built reaction kettle equipped with a thermometer, a circulating condensing device, and a mixer, a certain amount of PET bottle flakes and alcoholysis solvent EG are added to the reaction kettle, and heating, stirring and circulating condensed water are started. When the temperature reached 180°C, [bmim]Br was added and the reaction timed for 2.0h. After the reaction, pour the material liquid into the container, stir and cool down to room temperature. The cooled reaction solution was separated by centrifuge filtration. The filtered solid was poured into a reaction kettle, dissolved in water at a mass ratio of 10 / 1 to PET, and stirred. After dissolving, filter and separate by centrifuge. After dissolving, separate the obtained filtrate into the reaction kettle, start stirring and add a certain amount of activated carbon for decolorization. The decolorized material liquid is filtered and separated by a centrifuge, and the filter residue is activated carbon, whic...

Embodiment 2

[0045] In the built reaction kettle equipped with a thermometer, a circulating condensing device, and a mixer, a certain amount of PET bottle flakes and alcoholysis solvent EG are added to the reaction kettle, and heating, stirring and circulating condensed water are started. When the temperature reached 170°C, [bmim]Br was added and the reaction timed for 0.5h. After the reaction, pour the material liquid into the container, stir and cool down to room temperature. The cooled reaction solution was separated by centrifuge filtration. The filtered solid was poured into a reaction kettle, dissolved in water at a mass ratio of 10 / 1 to PET, and stirred. After dissolving, filter and separate by centrifuge. After dissolving, separate the obtained filtrate into the reaction kettle, start stirring and add a certain amount of activated carbon for decolorization. The decolorized material liquid is filtered and separated by a centrifuge, and the filter residue is activated carbon, whic...

Embodiment 3

[0047] In the built reaction kettle equipped with a thermometer, a circulating condensing device, and a mixer, a certain amount of PET bottle flakes and alcoholysis solvent EG are added to the reaction kettle, and heating, stirring and circulating condensed water are started. When the temperature reached 160°C, [bmim]Br was added and the reaction timed for 0.5h. After the reaction, pour the material liquid into the container, stir and cool down to room temperature. The cooled reaction solution was separated by centrifuge filtration. The filtered solid was poured into a reaction kettle, dissolved in water at a mass ratio of 10 / 1 to PET, and stirred. After dissolving, filter and separate by centrifuge. After dissolving, separate the obtained filtrate into the reaction kettle, start stirring and add a certain amount of activated carbon for decolorization. The decolorized material liquid is filtered and separated by a centrifuge, and the filter residue is activated carbon, whic...

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Abstract

The invention relates to a recycling method for catalytic degradation of waste PET, and is characterized in that the recycling method comprises the process steps: degradation reaction, cooling crystallization, filtration, dissolution, decoloration, crystallization, drying and the like. The method is composed of two circulations of degradation and separation recovery, an alcoholysis agent is not contacted with dissolving water, large amount of energy consumption and great production costs generated in distillation separation of water and an alcoholysis liquid are saved, the amount of a solvent and the circular degradation cycle are reduced, production costs are significantly decreased, and the method is green, clean, fast and efficient. Scale production for alcoholysis recycling of the waste PET is achieved, and considerable social benefits and economic benefits are brought.

Description

Technical field: [0001] The invention relates to a method for catalytically degrading and recycling waste PET. It belongs to the fields of green and clean catalytic technology, chemical production and plastics. Background technique: [0002] In 1953, DuPont first realized the industrial production of linear thermoplastic polymer PET (polyethylene terephthalate). Because of its excellent physical and chemical properties, it is widely used in the fields of synthetic fibers, plastic packaging bottles, engineering plastics and films, especially product packaging bottles in the food field, and its application fields are still expanding. However, due to the strong chemical inertness of PET under natural conditions, it is difficult to be biodegraded, and a large amount of waste PET not only causes serious pollution to the environment. Moreover, according to statistics, about 3-5% will become waste in the PET production and processing process, and most of the PET products used in ...

Claims

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Application Information

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IPC IPC(8): C07C69/82C07C67/297C07C67/48
CPCC07C67/297C07C67/48C07C67/52C07C67/56C07C69/82Y02P20/50Y02P20/582
Inventor 吕兴梅孙鹏周清张锁江辛加余贾彩
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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