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Preparation method of recycled polyester

A technology for regenerating polyesters and polyesters, applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, plastic recycling, etc., can solve the problems of catalyst heterogeneity and low catalytic efficiency, and achieve high efficiency and The effect of directional catalytic activity, increasing storage cost, improving homogeneity and ligand exchange activity

Active Publication Date: 2015-02-04
JIANGSU HENGZE COMPOSITE MATERIALS TECH
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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 kind of preparation method of regenerated polyester, aim at solving the unfavorable that the disclosed alcoholysis catalyst used in the chemical regeneration process of polyester alcoholysis remains in the alcoholysis product to produce again polycondensation process impact, and the problem of low catalytic efficiency due to the heterogeneity of the catalyst in the depolymerization solution

Method used

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  • Preparation method of recycled polyester
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  • Preparation method of recycled polyester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] At first carry out the preparation of ethylene glycol lithium titanate, it comprises the following steps:

[0051] a) Uniformly mix tetraethyl titanate with ethylene glycol at 50°C under nitrogen protection, the molar ratio of tetraethyl titanate to ethylene glycol is 1:100;

[0052] b) Add lithium hydroxide, the molar ratio of lithium hydroxide to tetraethyl titanate is 2.05:1, continue to stir until the reaction system is a uniform and transparent liquid, then raise the reaction temperature to 180°C;

[0053] c) During the reaction process, reflux ethylene glycol and exclude the low-boiling ethanol and water generated by the reaction. The reaction time is 3 hours. Completely evaporate the ethylene glycol in the system, and completely evaporate the dihydric alcohol in the system to obtain a white solid, which is recrystallized three times with ethanol-chloroform to obtain a colorless crystal, which is to obtain ethylene glycol lithium titanate;

[0054] The structural...

Embodiment 2

[0065] At first carry out the preparation of ethylene glycol sodium titanate, it may further comprise the steps:

[0066] a) Uniformly mix tetra-n-butyl titanate with ethylene glycol at 150°C under nitrogen protection, the molar ratio of tetra-n-butyl titanate to ethylene glycol is 1:50;

[0067] b) Add sodium hydroxide, the molar ratio of sodium hydroxide to tetra-n-butyl titanate is 2.03:1, and continue to stir until the reaction system becomes a uniform and transparent liquid, then raise the reaction temperature to 210°C;

[0068] c) During the reaction process, reflux ethylene glycol and exclude the low-boiling n-butanol and water generated by the reaction. The reaction time is 2 hours. Completely evaporate the ethylene glycol in the system and completely evaporate the dihydric alcohol in the system to obtain a white solid, which is recrystallized three times with ethanol-chloroform to obtain a colorless crystal, which is to obtain ethylene glycol sodium titanate;

[0069...

Embodiment 3

[0080] At first carry out the preparation of propylene glycol potassium titanate, it may further comprise the steps:

[0081] a) Uniformly mix tetraisopropyl titanate with 1,2-propanediol at 100°C under nitrogen protection conditions, the molar ratio of tetraisopropyl titanate to 1,2-propanediol is 1:80;

[0082] b) Add potassium hydroxide, the molar ratio of potassium hydroxide to tetraisopropyl titanate is 2.02:1, continue to stir until the reaction system is a uniform and transparent liquid, then raise the reaction temperature to 200°C;

[0083] c) During the reaction, reflux 1,2-propanediol and exclude the low-boiling isopropanol and water generated by the reaction. The reaction time is 4 hours. After the reaction is completed, the temperature is 200 ° C, and the reaction system pressure is 0.7 atm, 1 min Completely evaporate the ethylene glycol in the system, and completely evaporate the glycol in the system to obtain a light yellow solid, which is recrystallized three ti...

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Abstract

The invention relates to a preparation method of recycled polyester for the field of chemical recycling of waste polyester. A dihydric alcohol titanium alkali metal coordination compound which can be dissolved in glycol is used as a catalyst for catalyzing depolymerization of glycol of a waste polyester material and a re-polymerization process of a depolymerization product. The catalyst has relatively high catalytic activity to depolymerization of glycol of waste polyester and the re-polymerization process of the depolymerization product so as to avoid adverse effects on re-polymerization because of catalyst residues after catalytic alcoholysis by soluble catalysts such as zinc acetate, zinc-containing metal salts and halogen-containing ionic liquids and the like, so that the catalyzing efficiency is low due to complex mass transfer in a catalytic process of a solid heterogeneous catalyst. By adopting the preparation method of the recycled polyester, the catalyst which does not needed to be removed from the depolymerization product can be used for re-polycondensation, so that the separating and purifying cost of the depolymerization product is greatly lowered and smooth operation of the re-polymerization process and the quality of the recycled polymer are ensured, thereby providing probability for continuous chemical recycling of PET (polyethylene terephthalate).

Description

technical field [0001] The invention belongs to the technical field of chemical regeneration of polyester, and relates to a preparation method of recycled polyester, in particular to a method for polyester using a dihydric alcohol titanium alkali metal coordination compound soluble in ethylene glycol as a catalyst. A method for preparing recycled polyester obtained by depolymerizing ethylene glycol and polycondensing again. Background technique [0002] Polyethylene terephthalate (PET, referred to as polyester) is a semi-crystalline thermoplastic polymer material with excellent performance, widely used in chemical fiber, packaging, medicine, electronic machinery and other fields, in 2010 , the total global polyester production reached 56.1 million tons. With the rapid development of the polyester industry, the disposal of waste polyester products has come one after another. The huge stock of waste polyester products in the society has not only brought huge pressure to the e...

Claims

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Application Information

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IPC IPC(8): C08G63/183C08K5/521C08K5/526C08K3/32C08J11/24C08L67/02B01J31/22
CPCY02P20/584Y02W30/62
Inventor 王少博王华平王朝生李建武陈向玲王赛博
Owner JIANGSU HENGZE COMPOSITE MATERIALS TECH
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