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Method for directly depolymerizing PET waste and preparing plasticizer

A waste polyester and catalyst technology, which is applied in the direction of chemical instruments and methods, catalyst carriers, ester group and hydroxyl reaction preparation, etc., can solve the problems of cumbersome process and multi-energy consumption, and achieve simplified reaction process, reduced energy consumption, and improved The effect of specific surface area

Inactive Publication Date: 2016-08-24
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in order to remove the reaction product ethylene glycol from the reaction process, more energy consumption is inevitably required, and the process is also relatively cumbersome.

Method used

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  • Method for directly depolymerizing PET waste and preparing plasticizer
  • Method for directly depolymerizing PET waste and preparing plasticizer
  • Method for directly depolymerizing PET waste and preparing plasticizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Preparation of a kaolin-based supported solid catalyst with an active component content of 95%

[0023] Weigh 60.5783g SnSO 4 Soluble in appropriate amount of H 2 In O, add 2 g of the above-mentioned LC45 kaolin, stir evenly, slowly add ammonia water dropwise, and stir vigorously, adjust the pH to 9, filter the obtained precipitate, wash until neutral, and dry at 120°C to obtain kaolin Supported solid esterification catalyst. Wherein the content of SnO in the catalyst is 95%.

Embodiment 2

[0024] Example 2: Preparation of a kaolin-based supported solid catalyst with an active component content of 1%

[0025] Weigh 0.3220g SnSO 4 Soluble in appropriate amount of H 2 In O, add 20g of the above-mentioned LC45 kaolin, stir evenly, slowly add ammonia water dropwise, and stir vigorously, adjust the pH to 9, filter the obtained precipitate, wash until neutral, and dry at 120°C to obtain kaolin Supported solid esterification catalyst. Wherein the content of SnO in the catalyst is 1%.

Embodiment 3

[0026] Example 3: Transesterification reaction of waste polyester and 2-ethylhexanol at 190°C

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Abstract

A method for directly depolymerizing PET waste and preparing a plasticizer is disclosed. According to the invention, a kaolin supported solid catalyst is prepared and applied in recycling of waste polyester (PET). A transesterification reaction is carried out in an autoclave. Under experimental conditions, depolymerization rate of PET can reach 100%, and selectivity of bis(2-ehylhexyl)terephthalate can reach 80-90%. According to the kaolin supported solid catalyst, kaolin undergoes acid treatment, and a stannous oxide active component is supported by an impregnation precipitation method. The catalyst is applied in an esterification reaction or transesterification reaction, has high catalytic activity, and can remarkably accelerate reaction progress and simplify aftertreatment.

Description

technical field [0001] The present invention relates to the recovery and comprehensive utilization of PET polyester waste materials. Specifically, a solid catalyst with specially treated kaolin as a carrier is used to depolymerize PET in one step with isooctyl alcohol and prepare terephthalic acid di(2 - Ethyl)hexyl ester plasticizer method. Background technique [0002] PET is the abbreviation of polyethylene terephthalate. Because of its good physical and chemical stability, PET is widely used in various packaging materials, electronic appliances and auto parts, such as beverage bottles, film sheets, integrated circuit casings, etc. But also because of its chemical stability, waste PET polyester is difficult to degrade in nature, and a large amount of various waste polyesters are discarded in the natural environment to cause environmental pollution. Therefore, recycling waste polyester has good environmental and economic benefits. By chemical methods, that is, under the...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J23/14B01J23/889C07C67/03C07C69/82C08K5/12
Inventor 沈俭一徐军许贵洲沈新华杨玉梅陈文瑞白志平
Owner NANJING UNIV
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