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Method for preparing bottle-grade slices by recycling waste polyester bottles

A technology of waste polyester and polyester bottles, which is applied in recycling technology, plastic recycling, etc., can solve problems such as difficult common mixing and processing, achieve stable melt molecular weight distribution, adjust the amount of recycled waste polyester bottles, and improve The effect of cleanliness

Active Publication Date: 2020-05-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the problems existing in the existing recycling process of waste polyester bottles, especially the problem that the colored bottles and colorless bottles of waste polyester bottles are difficult to mix and process together. Based on the existing polyester five-kettle process, Provided is a physical-chemical method for recycling colored and colorless waste polyester bottles to prepare food-grade bottle-grade polyester

Method used

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  • Method for preparing bottle-grade slices by recycling waste polyester bottles
  • Method for preparing bottle-grade slices by recycling waste polyester bottles
  • Method for preparing bottle-grade slices by recycling waste polyester bottles

Examples

Experimental program
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Effect test

Embodiment 1

[0033] PET bottle-grade resin is made from terephthalic acid, isophthalic acid, ethylene glycol, colored waste PET polyester bottles, colorless waste PET polyester bottles, phosphoric acid, sodium acetate, and ethylene glycol antimony. Phthalic acid accounts for 69.8% of the total weight, isophthalic acid accounts for 1.8% of the total weight, colored waste PET polyester bottles account for 10% of the total weight, colorless waste PET polyester bottles account for 10% of the total weight, phosphoric acid accounts for 20ppm of the total weight, sodium acetate accounts for 50ppm of the total weight, and ethylene glycol antimony accounts for 170ppm of the total weight.

[0034] like figure 1 As shown, terephthalic acid, isophthalic acid, and ethylene glycol are beaten and mixed, and phosphoric acid and sodium acetate are added during the beating and mixing stage (to prevent the etherification of ethylene glycol in the conventional esterification process), and enter the first este...

Embodiment 2

[0038] PET bottle-grade resin is made from terephthalic acid, isophthalic acid, ethylene glycol, colored waste PET polyester bottles, colorless waste PET polyester bottles, phosphoric acid, sodium acetate, and ethylene glycol antimony. The amount of raw material, colored waste PET polyester bottle, and the treatment of colorless waste PET polyester bottle are the same as in Example 1, except that the filter melt of colorless waste PET polyester bottle is adjusted and added at the outlet of the first pre-shrinking kettle, and all the other process conditions are the same as those in Example 1. The same as in Example 1, after the polycondensation reaction, the tape was cast and pelletized, the intrinsic viscosity of the particles was controlled at 0.62dL / g, and the molecular weight distribution index was between 1.95. After drying and pre-crystallization, the particles enter the solid-phase viscosity-increasing reactor and react at a reaction temperature of 210°C for 18 hours to ...

Embodiment 3

[0041] PET bottle-grade resin is made from terephthalic acid, isophthalic acid, ethylene glycol, colored waste PET polyester bottles, colorless waste PET polyester bottles, phosphoric acid, sodium acetate, and ethylene glycol antimony. Raw material consumption, colored waste PET polyester bottle, the processing of colorless waste PET polyester bottle are the same as embodiment 1, except that the filter melt of colorless waste PET polyester bottle is adjusted and added at the outlet of the second pre-shrinking kettle, all the other process conditions are the same as The same as in Example 1, after the polycondensation reaction, the tape was cast and pelletized, the intrinsic viscosity of the particles was controlled at 0.62dL / g, and the molecular weight distribution index was 1.95. After drying and pre-crystallization, the particles enter the solid-phase thickening reactor and react at a reaction temperature of 210°C for 18 hours. The bottle-grade slices produced have an intrins...

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Abstract

The invention discloses a method for preparing bottle-grade slices by recycling waste polyester bottles. According to the method, colored bottles are subjected to alcoholysis, decoloration, crystallization, dissolution and other methods to obtain high-purity BHET, and then the high-purity BHET enters a reaction system; the melt of colorless bottles is injected into a condensation polymerization reaction system through melt extrusion to participate in a transesterification reaction of primary melt, and harmful gas is further removed in the reaction process to improve the cleanliness of the melt; and the crystallization rate is reduced by optimizing the addition amount of a raw material IPA, the intrinsic viscosity of the melt can be flexibly adjusted after the alcoholysis product, the recovered melt and the primary melt pass through a reactor, and volatile substances generated by degradation in the alcoholysis and melting processes of the recovered bottles can be effectively removed byvirtue of disc vacuum film formation. The method has the advantages that the amount of recycled waste polyester bottles can be adjusted, the color requirement of the waste polyester bottles is low, the intrinsic viscosity of the product is stable, the acetaldehyde content is low, and the crystallization rate is consistent with the crystallization rate of raw materials. Compared with the existing bottle-to-bottle technology, the method of the invention can be applied to the fields of food-grade bottle slices such as water bottles, carbonic acid bottles, oil bottles and the like.

Description

technical field [0001] The invention belongs to the field of chemical production, and relates to a method for preparing bottle-level slices by recycling waste polyester bottles. Background technique [0002] Polyethylene Terephthalate (PET, polyester for short) is a widely used synthetic polymer material. In 2017, the global production capacity of polyester was about 67 million tons, of which the domestic production capacity of bottle-grade chips was about 8.7 million tons. As a petroleum-based synthetic polymer material, polyester cannot be degraded by external microorganisms for a long time, and it is easy to cause "white pollution" and "space pollution". In addition, the social reserves of polyester products for bottles are very large, especially When used as beverage bottles and oil pot bottles, they are mostly used for one-time use. Therefore, recycling polyester bottles has certain economic and environmental effects. [0003] The recycling technology of polyester bot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183C08G63/181C08G63/78C08J11/24C08L67/02
CPCC08G63/183C08G63/181C08G63/78C08J11/24C08J2367/02Y02W30/62
Inventor 何胜君朱兴松王金堂王余伟张金峰殷孝谦
Owner CHINA PETROLEUM & CHEM CORP
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