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Method for catalytically alcoholizing polyethylene terephthalate

A technology of polyethylene terephthalate and polyethylene terephthalate, which is applied in the field of urea-catalyzed alcoholysis of polyethylene terephthalate, which can solve the problem of difficult separation of catalyst and product and deterioration of plastic performance. Bad question

Active Publication Date: 2012-11-28
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because the performance of the plastic after physical recycling is poor, and it is not allowed to be used in the food industry, and the traditional chemical recycling method often requires high temperature and high pressure, and there are problems such as the catalyst and the product are not easy to separate, so the present invention develops cheap, easy-to-obtain, high-conversion High efficiency, high selectivity, easy separation from products, mild reaction conditions, green energy saving and environmental protection catalysts

Method used

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  • Method for catalytically alcoholizing polyethylene terephthalate
  • Method for catalytically alcoholizing polyethylene terephthalate
  • Method for catalytically alcoholizing polyethylene terephthalate

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Implementation method: Add 5.0g PET mineral water bottle flakes, 20.0g ethylene glycol and 0.25g urea (CO(NH) 2 ). The reaction temperature was controlled at 180° C. under normal pressure, condensed and refluxed for 2.5 hours, and then cooled to room temperature. Under these conditions, the degradation rate of PET polyester is 73.2%, the selectivity of monomer ethylene terephthalate (BHET) is 74.4%, and the mass percentage of monomer in the product is 90.1%.

Embodiment 2

[0023] Other conditions are with embodiment 1, and the catalyst that adds is 0.5g CO (NH) 2 . Under these conditions, the degradation rate of PET polyester is 100%, the selectivity of BHET is 70.0%, and the mass percentage of monomer in the product is 86.6%.

Embodiment 3

[0025] Other conditions are the same as embodiment 1, and the catalyst that adds is 1.0g CO (NH) 2 . Under these conditions, the degradation rate of PET polyester is 100%, the selectivity of BHET is 72.1%, and the mass percentage of monomer in the product is 90.0%.

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Abstract

The invention relates to a new method for catalytically alcoholizing polyethylene terephthalate (PET), which is characterized in that urea is taken as a catalyst, one or the mixture of ethylene glycol, diethylene glycol, propylene glycol, 1, 4-butylene glycol, pentylene glycol, hexylene glycol, 1, 7-heptandiol and triethylene glycol as a solvent, under the conditions that the catalyst usage is 0.01%-10% of the solvent by weight, the reaction temperature is 70DEG C-25 DEG C, the pressure is normal pressure and the reaction time is 1 minutes-4 hours, the polyethylene terephthalate is alcoholized. The method has the advantages of moderate reaction conditions, low-priced easily-obtained catalyst, high catalytic activity, high degradation rate, high selectivity, easily separated products, environmental friendliness, energy conservation and the like.

Description

Technical field: [0001] The invention relates to the technical field of green and clean catalysis, in particular to a new method for urea-catalyzed alcohol depolymerization of polyethylene terephthalate. Background technique: [0002] Polyethylene terephthalate (PET) has the characteristics of odorless, tasteless, non-toxic, light weight, high strength, good air tightness, and high transparency, and is widely used in mineral water bottles, carbonated beverage bottles, synthetic fibers, plastics, etc. Film and insulating materials and other fields. At present, the world's annual output of polyester has exceeded 50 million tons. Since most PET polyester products are discarded after use, they have the characteristics of large volume and difficult natural degradation. If the used waste polyester is directly discharged into the environment, it will not only cause persistent pollution to the environment, but also cause a huge waste of resources. . Therefore, recycling PET polye...

Claims

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Application Information

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IPC IPC(8): C07C69/82C07C67/297
Inventor 张锁江王倩吕兴梅周雪源张香平李春山李增喜
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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