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Method for preparing terephthalic acid through degradation of waste PET

A terephthalic acid and waste technology, applied in the preparation of carboxylate/lactone, organic chemistry, etc., can solve the problems of many by-products and low yield of terephthalic acid, achieve high conversion efficiency and increase the reaction interface , The effect of simple process

Inactive Publication Date: 2018-05-18
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Although the existing method for preparing terephthalic acid by degradation of waste PET provided by the prior art has the advantages of reducing raw material costs and being conducive to sustainable development, it still has the defects of low yield of terephthalic acid and many by-products

Method used

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Examples

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Effect test

Embodiment 1

[0038] A method for preparing terephthalic acid by waste PET degradation, is characterized in that, the preparation method comprises the following steps:

[0039] (1) Add 20 parts of waste PET fragments into the hydrothermal kettle, add a depolymerization solvent with a liquid-solid mass ratio of 1:1, add a depolymerization catalyst according to 0.5% of the mass of waste PET fragments, and then add 2 zeolites;

[0040] (2) Put the hydrothermal kettle in a heater at 180°C. After reacting for 1 hour, take out the hydrothermal kettle and cool it to room temperature. As for the microwave oven, install an air condenser and a spherical condenser in sequence, and set the reaction time as 20min, adjust the microwave power to 450W after starting, and adjust the power to 150W after reflowing for 2min;

[0041] (3) Add 5 parts of boiling water to the product obtained in step (2), stir to dissolve it fully, filter it in the Buchner funnel, put the filtrate in the heating pot, add 2 zeolit...

Embodiment 2

[0044]A method for preparing terephthalic acid by waste PET degradation, is characterized in that, the preparation method comprises the following steps:

[0045] (1) Add 30 parts of waste PET fragments into the hydrothermal kettle, add a depolymerization solvent with a liquid-solid mass ratio of 3:1, add a depolymerization catalyst according to 2.0% of the mass of waste PET fragments, and then add 2 zeolites;

[0046] (2) Put the hydrothermal kettle in a heater at 240°C, and after reacting for 3 hours, take out the hydrothermal kettle and cool it to room temperature. As for the microwave oven, install the air condenser and the spherical condenser in sequence, and set the reaction time as 20min, adjust the microwave power to 450W after starting, and adjust the power to 150W after reflowing for 2min;

[0047] (3) Add 10 parts of boiling water to the product obtained in step (2), stir to make it fully dissolve, filter it in the Buchner funnel, put the filtrate in a heating pot, a...

Embodiment 3

[0050] A method for preparing terephthalic acid by waste PET degradation, is characterized in that, the preparation method comprises the following steps:

[0051] (1) Add 25 parts of waste PET fragments to the hydrothermal kettle, add a depolymerization solvent with a liquid-solid mass ratio of 2:1, add a depolymerization catalyst according to 1.0% of the mass of waste PET fragments, and then add 2 zeolites;

[0052] (2) Put the hydrothermal kettle in a heater at 200° C. After reacting for 2 hours, take out the hydrothermal kettle and cool it to room temperature. As for the microwave oven, install an air condenser and a spherical condenser in sequence, and set the reaction time as 20min, adjust the microwave power to 450W after starting, and adjust the power to 150W after reflowing for 2min;

[0053] (3) Add 6 parts of boiling water to the product obtained in step (2), stir to make it fully dissolve, filter it in the Buchner funnel, put the filtrate in a heating pot, add 2 zeo...

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Abstract

The invention specifically relates to a method for preparing terephthalic acid through degradation of waste PET, belonging to the technical field of utilization of chemical renewable resources. According to the method, waste PET materials and water are used as raw materials and subjected to a catalytic hydrothermal reaction to prepare terephthalic acid and glycol; under proper degradation conditions, the degradation rate of PET polyester reaches 100.0%, and the yield of terephthalic acid reaches 99.75%; and the purity of treated terephthalic acid is close to 100%. The provided method for preparing terephthalic acid through degradation of waste PET compensates for the defects of low yield of terephthalic acid and a great number of by-products in the prior art to a certain extent.

Description

technical field [0001] The invention relates to the technical field of utilization of chemical renewable resources, in particular to a method for preparing terephthalic acid by degrading waste PET. Background technique [0002] With the increasing popularity of polyester products in daily life, the output of polyester has also increased rapidly, and how to deal with the resulting waste polyester has gradually attracted people's attention. The sources of waste polyester are mainly concentrated in two aspects: one is that about 3% to 5% of the corner waste is generated during the production and processing of polyester; the other is used polyester products, such as beverage bottles, packaging Bags, etc. These packaging materials are mostly disposable and cannot be reused, so the amount of waste is huge. Although waste polyester does not cause direct pollution to the environment, due to its high chemical stability, waste polyester cannot be decomposed naturally in a short perio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/09C07C63/26
CPCC07C51/09C07C63/26
Inventor 张龙汤旭东崔瑛娜
Owner CHANGCHUN UNIV OF TECH
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