Method for synthesizing PVC plasticiser by reclaiming waste polyester

A technology of waste polyester and plasticizer, applied in the field of plasticizer, can solve problems such as waste of resources, and achieve the effects of low production cost, shortened process flow, and reduced reaction time

Inactive Publication Date: 2008-11-12
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for the resource utilization of waste polyester to synthesize PVC plasticizer DOTP, to solve the waste of resources caused by a large amount of waste polyester and the impact of the oil crisis on the PVC plasticizer industry, and to provide a method for using waste polyester to synthesize The plasticizer DOTP method not only has good product quality, but also produces less waste water in the production process, achieving the purpose of clean production

Method used

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  • Method for synthesizing PVC plasticiser by reclaiming waste polyester
  • Method for synthesizing PVC plasticiser by reclaiming waste polyester

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Add a certain amount of polyester bottle flakes, 2-ethylhexanol, and tetrabutyl titanate into a three-necked flask equipped with a stirrer, a thermometer, and an oil-water separator, wherein the moles of polyester and 2-ethylhexanol The ratio is 1:4, and the amount of tetrabutyl titanate is 0.5% of the polyester mass. Control the temperature at 180°C-220°C, stir for 5 hours, cool to 70°C-90°C, neutralize with 3% sodium carbonate aqueous solution, then wash with water, separate the water layer and the organic layer; add an adsorbent to the organic layer to neutralize Alumina, the dosage is 5% of the quality of polyester bottle flakes, heated under reduced pressure to remove excess 2-ethylhexanol, and filtered to remove neutral alumina to obtain light yellow transparent liquid product plasticizer DOTP. The infrared spectrum of the product DOTP as figure 1 Shown: 1728.0cm -1 is the stretching vibration of C=O in the ester group, 1268.9cm -1 and 1117.7cm -1 It is the ch...

Embodiment 2

[0026] In the reaction device of embodiment 1, add polyester bottle flakes, 2-ethylhexanol, zinc acetate of a certain proportion, solid acid catalyst, wherein the mol ratio of polyester and 2-ethylhexanol is 1: 6, The total consumption of zinc acetate and solid acid catalyst is 1.0% of the quality of polyester bottle flakes. Heat and stir, control the reaction temperature at 180°C-220°C, stir for 6 hours, cool to 70°C-90°C, neutralize with 3% aqueous sodium hydroxide solution, wash with water and separate the water layer and the organic layer; add clay to the organic layer , the dosage is 5% of the quality of polyester bottle flakes, heated under reduced pressure to remove excess 2-ethylhexanol, and filtered to remove clay to obtain light yellow transparent liquid product plasticizer DOTP.

Embodiment 3

[0028] Add a certain proportion of polyester rags, 2-ethylhexanol, and solid acid catalyst in the reaction device of Example 1, wherein the molar ratio of polyester rags to 2-ethylhexanol is 1: 20 , the consumption of solid acid catalyst is 0.5% of the quality of polyester polyester rags. Heat and stir, control the reaction temperature at 180°C-220°C, react for 5 hours, cool to 70°C-90°C, wash with 3% sodium carbonate aqueous solution, and then separate the water layer and the organic layer after washing with water; add active Carbon, the consumption is 5% of the quality of polyester polyester rags, heated under reduced pressure to remove excess 2-ethylhexanol, and filtered to remove active carbon to obtain light yellow transparent liquid product plasticizer DOTP.

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Abstract

The invention discloses a method for synthesizing PVC plasticizer DOTP by waste polyester resource utilization, which belongs to the plasticizer technical field. The method comprises the following steps that: 1. under the existence of catalyst, waste polyester scraps are heated with 2-ethyl hexanol to carry out the degradation reaction; 2. glycol produced by the reaction and the 2-ethyl hexanol are coboiled and condensed, and then the glycol is removed through water scrubbing and is reclaimed; 3. reactant coarse ester is orderly subject to aqueous alkali and water for washing, an aqueous layer and an organic layer are separated; the organic layer is added with adsorbent, then the unreacted 2-ethyl hexanol is steamed out, and the plasticizer product dioctyl terephthalate (DOTP) is obtained after the filtration. The raw material of the invention, namely waste polyester can be polyester fiber, waste terylene cloth, leftover materials, waste polyester bottles, and polyester films and so on; the removal method of the catalyst adopts a water scrubbing filtration mode, the catalyst is simultaneously removed during neutralization, water scrubbing and filtration processes, and no additional process operation needs to be added for the removal of the catalyst, so the method has short process flow and low production cost.

Description

technical field [0001] The invention discloses a method for synthesizing PVC plasticizer DOTP by recycling waste polyester, and belongs to the technical field of plasticizers. Specifically, it relates to a method for recycling waste polyester and synthesizing plasticizer bis(2-ethyl)hexyl terephthalate (DOTP). Background technique [0002] Polyester (polyethylene terephthalate, PET) is mainly used to produce polyester fibers and films, such as mineral water bottles, etc. After the 1990s, my country became the center of polyester industry development, not only the original manufacturers Expand its production scale, and some new enterprises have built large-scale production lines one after another. At present, the annual output of polyester in my country has reached 10 million tons, and with the deepening of research on the modification of polyester materials, the consumption of polyester will inevitably increase rapidly. The large-scale production and use of polyester materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/82C07C67/03C07C67/00
Inventor 蒋平平石晓永卢云
Owner JIANGNAN UNIV
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