Method for producing dioctyl terephthalate from polyester waste

A technology for dioctyl phthalate and waste, which is applied in the field of producing dioctyl terephthalate by using PET polyester waste, can solve the problems of complex production process, difficult processing and high production cost, and achieves a simple production process , Overcome the effect of industrial waste water and low production cost

Inactive Publication Date: 2011-11-16
WUDI YONGXIN BIO ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process has the following disadvantages: ①Using PTA as a raw material, the production cost is high; ②During the esterification reaction, waste water is generated; ③The reaction adds an acidic catalyst, the production process is complicated, the treatment is difficult, and a large amount of waste water is generated during the treatment process
There are also domestic reports on the method of synthesizing DOTP from polyester waste, but the production process needs to be washed with alkaline water, and industrial waste water will also be generated, and waste water treatment will greatly increase production costs

Method used

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  • Method for producing dioctyl terephthalate from polyester waste
  • Method for producing dioctyl terephthalate from polyester waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The non-polyester materials in the polyester waste are picked out and crushed to obtain polyester flakes; the above polyester flakes are processed by cleaning and drying equipment to obtain clean polyester materials; the above clean polyester materials are mixed with industrial octanol Add it into the reaction kettle, the molar ratio of clean polyester material and industrial octanol is 1:3 according to the clean polyester material: industrial octanol, stir and heat up to 180°C, and when the pressure of the reactor is controlled to -0.03MPa, add The catalyst degrades the clean polyester material and undergoes a transesterification reaction with industrial octanol. The catalyst is a titanate lipid, and the amount of the catalyst is 0.1% of the clean polyester material. The reaction continues until the acid value of the sample in the kettle is equal to or less than 0.05 mgKOH / g, the degradation-transesterification reaction is completed; then the pressure in the reactor is ...

Embodiment 2

[0024] The non-polyester materials in the polyester waste are picked out and crushed to obtain polyester flakes; the polyester flakes are processed by cleaning and drying equipment to obtain clean polyester materials; the clean polyester materials and industrial octanol are added to the In the reaction kettle, the mol ratio of the clean polyester material added and industrial octanol is 1: 6 by clean polyester material: industrial octanol is 1: 6, and stirring is heated up to 240 ℃, when the control reactor pressure is-0.01MPa, add catalyst to make The clean polyester material is degraded and transesterified with industrial octanol. The catalyst is titanate, and the amount of the catalyst is 3% of the clean polyester material. The reaction time lasts until the acid value in the kettle is equal to or less than 0.05mgKOH / g, the degradation-transesterification reaction is completed; after the degradation-transesterification reaction is completed, the pressure in the reactor is co...

Embodiment 3

[0026] The non-polyester materials in the polyester waste are picked out and crushed to obtain polyester flakes; the polyester flakes are processed by cleaning and drying equipment to obtain clean polyester materials; the clean polyester materials and industrial octanol are added to the In the reaction kettle, the mol ratio of the clean polyester material added and industrial octanol is 1: 3 by clean polyester material: industrial octanol is 1: 3, and stirring is heated up to 240 ℃, when the control reactor pressure is-0.03MPa, add catalyst to make The clean polyester material is degraded and transesterified with industrial octanol. The catalyst is titanate, and the amount of the catalyst is 3% of the clean polyester material. The reaction time lasts until the acid value in the kettle is equal to or less than 0.05mgKOH / g, the degradation-transesterification reaction is completed; after the degradation-transesterification reaction is completed, the pressure in the reactor is co...

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PUM

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Abstract

The invention provides a method for producing dioctyl terephthalate from PET (Polyester) waste, belonging to the technical field of plasticizers. The method is implemented by the following steps of: coarsely crushing PET waste, cleaning and drying to obtain a clean PET material; adding the clean PET material and industrial octanol into a reaction kettle in a certain ratio and undergoing an ester exchange reaction under the action of a catalyst; returning the industrial octanol into the reaction kettle by dealcoholization for recycling to obtain crude dioctyl terephthalate; and adding a decoloring agent and a filter aid, fully stirring and filtering with a filter press to obtain finished dioctyl terephthalate. In the method, PET waste is taken as a raw material, the raw material is readily available, a new measure is provided for the recycling of the PET waste, and the requirement for recycling economy is met; and alkali neutralizing and water washing procedures are eliminated in the process flow, the defect of the production of a large amount of industrial waste water in the reaction process existing in the prior art is overcome, the production process is simple and the cost is low.

Description

technical field [0001] The invention relates to a production method of a plasticizer, in particular to a method for producing dioctyl terephthalate (DOTP) from PET polyester waste. technical background [0002] Polyester (the said polyester of the present invention is polyethylene terephthalate, namely PET) is the raw material of products such as producing dacron and packing bottle, and the total amount that my country produces polyester waste every year reaches 2,500,000 tons, and only Wastes with better quality and higher purity are used for the reproduction of polyester, and a considerable part of them are discarded directly, resulting in a waste of resources. How to realize the reuse of these discarded waste polyesters is of great significance in actual production. [0003] Plasticizers account for about 58% of the chemical additives market, and the annual consumption is large. At present, the products with the largest output are dioctyl phthalate (DOP) and dioctyl terep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/82C07C67/03C07C31/20C07C29/74
Inventor 王洪新于世涛徐清荣刘仕伟郑印璋
Owner WUDI YONGXIN BIO ENG
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