Method for catalyzing waste PET polyester methanol alcoholysis by deep eutectic solvent

A technology of deep eutectic solvent and methanol alcoholysis, which is applied in the field of polymer degradation and green catalysis, and can solve the problems of difficult product decolorization, high reaction temperature, and long reaction time

Inactive Publication Date: 2020-03-31
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The object of the present invention is to provide a kind of method that uses deep eutectic solvent as catalyst to catalyze methanolysis of waste PET polyester, aiming to solve the product decolorization difficulty existing in current PET glycolysis method and the high reaction temperature existing in methanolysis method , long reaction time and low conversion efficiency

Method used

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  • Method for catalyzing waste PET polyester methanol alcoholysis by deep eutectic solvent
  • Method for catalyzing waste PET polyester methanol alcoholysis by deep eutectic solvent
  • Method for catalyzing waste PET polyester methanol alcoholysis by deep eutectic solvent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-8

[0024] Waste PET bottle flakes and 0.5% of its mass urea / zinc acetate, urea / zinc chloride, urea / zinc sulfate, urea / zinc nitrate, urea / manganese acetate, urea / cobalt acetate, urea / copper acetate, urea / acetic acid Nickel deep eutectic solvent (the molar ratio of urea to metal salt is 4:1) and methanol with a mass ratio of 4:1 were put into the degradation kettle, and the temperature was raised to 170°C, and reacted for 60 minutes. After the reaction finishes, analyze the quality of product DMT and remaining PET, calculate the yield of DMT and the transformation rate of PET. The influence of different catalysts on the methanolysis reaction of waste PET polyester catalyzed by deep eutectic solvents is shown in No. 1-8 in Table 1.

[0025] The effect of different catalysts in Table 1 Examples 1 to 8 on the deep eutectic solvent catalyzed waste PET polyester methanolysis reaction

[0026]

[0027] 2. Effect of catalyst dosage on methanolysis reaction of waste PET polyester catal...

Embodiment 9-12

[0029] Waste PET bottle flakes and its quality 0.1%, 1%, 5%, 10% urea / zinc acetate deep eutectic solvent (the mol ratio of urea and metal salt is 4:1) and its mass ratio is 4:1 Methanol was put into the degradation tank, and after the temperature was raised to 170°C, the reaction was carried out for 60 minutes. After the reaction finishes, analyze the quality of product DMT and remaining PET, calculate the yield of DMT and the transformation rate of PET. The impact of catalyst consumption on the deep eutectic solvent catalyzed waste PET polyester methanolysis reaction is shown in sequence number 9-12 in Table 2.

[0030] Table 2 Examples 9-12 The impact of catalyst dosage on the deep eutectic solvent catalyzed waste PET polyester methanolysis reaction

[0031]

[0032]

[0033] 3. The effect of the amount of methanol on the methanolysis reaction of waste PET polyester catalyzed by deep eutectic solvent

Embodiment 13-17

[0035] Waste PET bottle flakes and its mass 0.5% urea / zinc acetate deep eutectic solvent (the molar ratio of urea and metal salt is 4:1) and its mass ratio is 0.5:1, 1:1, 2:1, 6 :1 or 20:1 methanol is put into the degradation tank, and after heating up to 170°C, react for 60 minutes. After the reaction, analyze the quality of the product DMT and the remaining PET, and calculate the yield of DMT and the conversion rate of PET. The impact of the amount of catalyst on the deep eutectic solvent catalyzed methanolysis of waste PET polyester is shown in the serial number 13-17 in Table 3.

[0036] Table 3 Examples 13-17 The influence of the amount of methanol on the deep eutectic solvent catalyzed waste PET polyester methanolysis reaction

[0037]

[0038] 4. The effect of reaction temperature on methanolysis of waste PET polyester catalyzed by deep eutectic solvent

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Abstract

The invention relates to a method for catalyzing waste PET polyester methanol alcoholysis by a novel deep eutectic solvent. The method is characterized in that waste PET polyester (including PET bottles, PET packaging sheets, PET fibers and PET textiles) is used as a raw material, a urea-based deep eutectic solvent is used as a catalyst, methanol in a mass ratio of (0.5:1)-(20:1) with PET is usedas a solvent, and methanol alcoholysis is carried out on PET under the conditions that the use amount of the catalyst is 0.1%-10% of the mass of PET, the reaction temperature is 120-200 DEG C and thereaction time is 10-360 minutes. The method for catalyzing waste PET polyester methanol alcoholysis by the novel deep eutectic solvent has the characteristics of wide raw material applicability, the cheap and easily available catalyst, the low alcoholysis temperature, the short alcoholysis time, the high PET conversion rate, the high DMT monomer yield and easiness in product separation.

Description

technical field [0001] The invention belongs to the technical field of polymer degradation and green catalysis, and in particular relates to a method for recovering waste PET polyester through methanolysis using a deep eutectic solvent as a catalyst. Background technique [0002] Polyethylene terephthalate (PET) has the advantages of light weight, high strength, high transparency, chemical stability, and good air tightness, so it is widely used in beverage packaging, fiber films, film base materials and other fields. In 2008, my country has become the world's largest producer and consumer of PET, accounting for more than half of the world. It is estimated that my country's PET output will reach 45.1 million tons in 2020. With the rapid development of the PET industry, accompanied by a sharp increase in waste PET, according to statistics, during the period 2011-2015, the cumulative production of waste textiles in my country reached 140 million tons. Therefore, realizing the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/24C08L67/02
CPCC08J11/24C08J2367/02Y02W30/62
Inventor 张锁江晏冬霞辛加余吕兴梅姚浩余陈茹茹刘力菲
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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