Preparation method of terephthalic acid-based ionic liquid catalyst and application of terephthalic acid-based ionic liquid catalyst in PET degradation

A terephthalic acid, ionic liquid technology, applied in chemical instruments and methods, ester group and hydroxyl reaction preparation, physical/chemical process catalysts, etc., can solve the problems of inability to achieve multiple recycling, poor stability, etc. The introduction of impurities, the improvement of purity, and the effect of high purity

Pending Publication Date: 2021-11-02
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

This type of catalyst is metal-free and biodegradable, but its stability is poor and it cannot be recycled multiple times

Method used

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  • Preparation method of terephthalic acid-based ionic liquid catalyst and application of terephthalic acid-based ionic liquid catalyst in PET degradation
  • Preparation method of terephthalic acid-based ionic liquid catalyst and application of terephthalic acid-based ionic liquid catalyst in PET degradation
  • Preparation method of terephthalic acid-based ionic liquid catalyst and application of terephthalic acid-based ionic liquid catalyst in PET degradation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This example illustrates that 1-ethyl-3-methylimidazole terephthalate ([Emim] 2 TPA) preparation.

[0032] First prepare the 1-ethyl-3-methylimidazolium chloride salt ([Emim]Cl) aqueous solution of 1mol / L, then this aqueous solution is slowly passed through the ion-exchange column that anion-exchange resin is housed with 0.2mL / min flow velocity, obtains [ Emim]OH in water. According to the [Emim]OH: terephthalic acid molar ratio of 2:1, weigh an appropriate amount of terephthalic acid. [Emim]OH aqueous solution was added dropwise to terephthalic acid, and the reaction was stirred at 0°C for 24h. Afterwards, a large amount of water was removed by rotary evaporation at 60° C., and then placed in a vacuum drying oven for 24 hours at 60° C. to obtain the target ionic liquid.

Embodiment 2

[0034] This example illustrates that 1-propyl-3-methylimidazolium terephthalate ([Pmim] 2 TPA) preparation.

[0035] First prepare the 1-propyl group-3-methylimidazolium chloride salt ([Pmim]Cl) aqueous solution of 0.5mol / L, then this aqueous solution is slowly passed through the ion-exchange column that anion exchange resin is housed with 1mL / min flow velocity, obtains [ Pmim]OH in water. According to the [Pmim]OH: terephthalic acid molar ratio of 2:1, weigh an appropriate amount of terephthalic acid. [Pmim]OH aqueous solution was added dropwise to terephthalic acid, and the reaction was stirred at 3°C ​​for 8h. Afterwards, a large amount of water was removed by rotary evaporation at 70° C., and then placed in a vacuum drying oven for 12 hours at 70° C. to obtain the target ionic liquid.

Embodiment 3

[0037] This example illustrates 1-butyl-3-methylimidazole terephthalate ([Bmim] 2 TPA) preparation.

[0038] First prepare the 1-butyl-3-methylimidazolium chloride salt ([Bmim]Cl) aqueous solution of 3mol / L, then this aqueous solution is slowly passed through the ion-exchange column that anion-exchange resin is housed with 0.1mL / min flow velocity, obtains [ Bmim]OH aqueous solution. According to the [Bmim]OH: terephthalic acid molar ratio of 2:1, weigh an appropriate amount of terephthalic acid. [Bmim]OH aqueous solution was added dropwise to terephthalic acid, and the reaction was stirred at 3°C ​​for 24h. Afterwards, a large amount of water was removed by rotary evaporation at 80° C., and then placed in a vacuum drying oven for 48 hours at 80° C. to obtain the target ionic liquid.

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Abstract

The invention relates to a preparation method of a terephthalic acid-based ionic liquid catalyst and application of the terephthalic acid-based ionic liquid catalyst in PET degradation. The method comprises the following steps: preparing ionic liquid of which the anion is hydroxyl by using an anion resin exchange method, then mixing the obtained ionic liquid with terephthalic acid according to a certain molar ratio, a terephthalic acid-based ionic liquid crude product is synthesized under certain conditions, and carrying out rotary evaporation and vacuum drying to obtain the terephthalic acid-based ionic liquid catalyst. The terephthalic acid-based ionic liquid catalyst provided by the invention has a structure similar to that of polyethylene glycol terephthalate (PET), and can effectively reduce the introduction of impurities in a reaction system and improve the product purity when being used in an ethylene glycol alcoholysis reaction of PET; the alcoholysis reaction rate is accelerated, and the product yield is improved; and meanwhile, the catalyst has excellent cyclic utilization performance, and the original catalytic activity is still kept after repeated cyclic utilization.

Description

technical field [0001] The invention relates to a preparation method of a terephthalic acid-based ionic liquid catalyst and its application in PET degradation, and relates to the field of functionalized ionic liquid and recycling of waste resources. Background technique [0002] Polyethylene terephthalate (PET) has the characteristics of light weight, water resistance, non-corrosion, non-toxic, etc. It is widely used in spinning, packaging, electronic appliances, medical and health care, construction, automobiles and other fields. However, waste PET products degrade slowly in the natural state, causing serious environmental pollution and waste of resources. Waste PET recycling technology can effectively solve the above problems. [0003] At present, the recycling methods of waste PET are mainly physical methods and chemical methods. The physical recycling method is mostly "downgrading recycling", and the value of recycled PET is low, and generally it can only be recycled o...

Claims

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Application Information

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IPC IPC(8): B01J31/02B01J31/04C07C69/82C07C67/03
CPCB01J31/0281B01J31/04C07C67/03C07C69/82
Inventor 吕兴梅张瑞琦姚浩余郑煦宋坤桐徐俊丽周清张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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