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Method for catalyzing alcoholysis performed on polyethylene glycol terephthalate (PET) by using CoCl42-/NiCl42-type ionic liquid

A technology of polyethylene terephthalate and ethylene phthalate, which is applied in the field of green and clean catalysis, can solve the problems of difficult separation of catalyst and product, difficulty of catalyst recycling, etc.

Active Publication Date: 2012-07-18
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

However, there are serious defects in these methods, that is, the catalyst and the product are not easily separated, which makes it difficult to recycle the catalyst.

Method used

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  • Method for catalyzing alcoholysis performed on polyethylene glycol terephthalate (PET) by using CoCl42-/NiCl42-type ionic liquid
  • Method for catalyzing alcoholysis performed on polyethylene glycol terephthalate (PET) by using CoCl42-/NiCl42-type ionic liquid
  • Method for catalyzing alcoholysis performed on polyethylene glycol terephthalate (PET) by using CoCl42-/NiCl42-type ionic liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Implementation method: in a 50ml three-necked flask, add 5.0g PET particles, PET particles with a size of 2.2×2.5×2.7mm, 20.0g ethylene glycol and 2.0g 1-butyl-3-methylimidazole cobalt tetrachloride ([ bmim] 2 CoCl 4 ). Control the reaction temperature to 170° C., the pressure to 1 atm, condense and reflux for 4 hours and then cool to room temperature. Under these conditions, the degradation rate of PET polyester is 100%, the selectivity of monomer ethylene terephthalate (BHET) is 80.0%, and the mass percentage of monomer in the product is 91.5%.

Embodiment 2

[0027] With embodiment 1, the catalyst that adds is 2.0g 1-butyl-3-methylimidazole nickel tetrachloride salt ([bmim] 2 NiCl 4 ). Under these conditions, the degradation rate of PET polyester is 45%, the selectivity of monomer ethylene terephthalate (BHET) is 64.3%, and the mass percentage of monomer in the product is 74.7%.

Embodiment 3

[0029] Implementation method: in a 50ml three-necked flask, add 5.0g PET particles, PET particles with a size of 12 mesh, 20.0g ethylene glycol and 2.0g 1-butyl-3-methylimidazole cobalt tetrachloride ([bmim] 2 CoCl 4 ). Control the reaction temperature at 170°C and the pressure at 1 atm, condense and reflux for 1.5 hours and then cool to room temperature. Under these conditions, the degradation rate of PET polyester is 100%, the selectivity of monomer ethylene terephthalate (BHET) is 79.2%, and the mass percentage of monomer in the product is 89.3%.

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Abstract

The invention relates to a method for catalyzing alcoholysis performed on polyethylene glycol terephthalate (PET) by using CoCl42- / NiCl42-type ionic liquid. The method is characterized by comprising the following steps: taking the CoCl42- / NiCl42-type ionic liquid as a catalyst; taking one or more of ethylene glycol, diethylene glycol, propylene glycol, butanediol, pentanediol and hexanediol as a solvent; and performing alcoholysis on the PET under the conditions of the dosage of the catalyst being 0.1%-20% of the mass of the solvent, the reaction temperature at 120-240 DEG C, the pressure at 1atm and the reaction time of 1 minutes to 8 hours. The method has the advantages of mild reaction conditions, high-speed reaction, high conversion rate, easiness in separating products, high catalytic activity, high selectivity, reusable catalyst, and the like.

Description

Technical field: [0001] The present invention relates to the technical field of green and clean catalysis, specifically refers to CoCl 4 2- / NiCl 4 2- Type ionic liquid catalyzed alcoholysis method of polyethylene terephthalate. Background technique: [0002] Polyethylene terephthalate (PET) is a linear thermoplastic polymer material with excellent properties. It has fatigue resistance, friction resistance, aging resistance, outstanding insulation, low production energy consumption, good processability and physical Good chemical stability and other excellent properties are widely used in food packaging, beverages, films, medicines, photosensitive films, decorative materials, electrical insulation materials and synthetic fibers and other fields. my country's PET polyester output rose from 5.52 million tons in 2000 to 20.01 million tons in 2008, and its output is soaring year by year. If these polyester wastes are directly discharged into the environment, it will not only...

Claims

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Application Information

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IPC IPC(8): C07C69/82C07C67/475B01J31/30B01J27/185B01J27/24B01J27/02C08J11/10
CPCY02P20/54Y02W30/62
Inventor 吕兴梅王倩张锁江张香平周雪源朱敏莉
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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