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 i

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

Example Embodiment

[0030] Example 1

[0031] In this example, 1-ethyl-3-methylimidazole p-terephthalate ([EMIM] 2 Preparation of TPA).

[0032] First, 1 mol / L 1-ethyl-3-methylimidazole salt ([EMIM] Cl) aqueous solution, then the aqueous solution was slowly slowed by an ion exchange column equipped with an anion exchange resin at a water rate of 0.2 ml / min, resulting in [ EMIM] OH aqueous solution. According to [EMIM] OH: The ratio of the molar ratio of terephthalic is 2: 1, and the appropriate amount of terephthalic acid is weighed. The [EMIM] OH aqueous solution was added dropwise to p-omealic acid, and the reaction was stirred at 0 ° C for 24 h. The removal of a large amount of moisture was removed at 60 ° C, and then the vacuum dried in a vacuum drying tank was dried in vacuo to dry 24 h, and the target ionic liquid was obtained.

Example Embodiment

[0033] Example 2

[0034] In this example, 1-propyl-3-methylimidazole p-obylene terephthalate ([PMIM] 2 Preparation of TPA).

[0035] First, 0.5 mol / L 1-propyl-3-methylimidazolium salt ([PMIM] Cl) aqueous solution was first obtained, and then the aqueous solution was slowly separated by an ion exchange column equipped with an anion exchange resin at a freeze-free flow rate of 1 ml / min. PMIM] OH aqueous solution. According to [PMIM] OH: The ratio of the molar ratio of terephthalic is 2: 1, and the appropriate amount of terephthalic acid is weighed. The [PMIM] OH aqueous solution was added dropwise to p-othylic acid, stirred at 3 ° C for 8 h. The removal of a large amount of moisture was removed at 70 ° C, and then the target ionic liquid was obtained in vacuo drying at 70 ° C in a vacuum drying tank.

Example Embodiment

[0036] Example 3

[0037] In this example, 1-butyl-3-methylimidazole p-obylene terephthalate ([BMIM] 2 Preparation of TPA).

[0038] First, 3 mol / L of 1-butyl-3-methylimidazolium salt ([BMIM] Cl) aqueous solution, then the aqueous solution was slowly slowed by an ion exchange column equipped with an anion exchange resin at 0.1 mL / min. BMIM] OH aqueous solution. According to [BMIM] OH: The ratio of the molar ratio of terephthalic is 2: 1, and the appropriate amount of terephthalic acid is weighed. The [BMIM] OH aqueous solution was added dropwise to p-terephthalic acid, stirred at 3 ° C for 24 h. The removal of a large amount of moisture was removed at 80 ° C, then placed in a vacuum drying tank at 80 ° C for 48 h, and the target ionic liquid was obtained.

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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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