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Low-energy-consumption and high-benefit waste polyester chemical recycling method

A high-efficiency, low-energy-consumption technology, applied in the fields of fiber chemical characteristics, single-component polyester rayon, textiles and papermaking, etc., can solve the problems of difficult separation of polyester components, high recycling costs, and complex components. Achieve the effect of avoiding uneven mixing of materials, reducing volume and improving alcoholysis rate

Pending Publication Date: 2021-08-27
ZHEJIANG TONGKUN NEW MATERIALS RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For many final consumer products of polyester, such as textiles, due to the complex composition and difficulty in separating polyester components, the recycling cost of these waste polyesters is high, and government policy inclination is also necessary

Method used

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  • Low-energy-consumption and high-benefit waste polyester chemical recycling method
  • Low-energy-consumption and high-benefit waste polyester chemical recycling method
  • Low-energy-consumption and high-benefit waste polyester chemical recycling method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A low-energy, high-efficiency waste polyester chemical recycling method involved in this embodiment comprises the following steps:

[0038] Step 1: The waste silk is crushed into recycled material powder through customized equipment, and the particle size of the powder is less than 1mm.

[0039]Step 2: Mix the recycled material powder, PTA and ethylene glycol in the beating tank in proportion to form a slurry. The mass ratio of the recycled material powder to the raw material is 1:9, and the molar ratio of PTA to ethylene glycol in the raw material is 1: 1.7, the addition amount of the antimony-based catalyst is 190ppm, and the addition amount of the matting agent is 1.13% of the mass of the polyester produced from the raw material.

[0040] Step 3: The mixed slurry is transported to the esterification tank, and ethylene glycol is used for alcoholysis at 210-270° C., and the recycled material powder undergoes alcoholysis reaction, and the residence time of alcoholysis (...

Embodiment 2

[0045] A low-energy, high-efficiency waste polyester chemical recycling method involved in this embodiment comprises the following steps:

[0046] Step 1: The waste silk is crushed into recycled material powder through customized equipment, and the particle size of the powder is less than 1mm.

[0047] Step 2: Mix the recycled material powder, PTA and ethylene glycol in the beating tank in proportion to form a slurry. The mass ratio of the recycled material powder to the raw material is 3:7, and the molar ratio of PTA to ethylene glycol in the raw material is 1: 1.9, the addition amount of antimony-free catalyst is 10ppm, and the addition amount of matting agent is 1.13% of the mass of polyester produced from raw materials.

[0048] Step 3: The mixed slurry is transported to the esterification tank, and ethylene glycol is used for alcoholysis at 210-270° C., and the recycled material powder undergoes alcoholysis reaction, and the residence time of alcoholysis (esterification) ...

Embodiment 3

[0053] A low-energy, high-efficiency waste polyester chemical recycling method involved in this embodiment comprises the following steps:

[0054] Step 1: The waste silk is crushed into recycled material powder through customized equipment, and the particle size of the powder is less than 1mm.

[0055] Step 2: Mix the recycled material powder, PTA and ethylene glycol in proportion in the beating tank to form a slurry. The mass ratio of the recycled material powder to the raw material is 5:5, and the molar ratio of PTA to ethylene glycol in the raw material is 1: 1.9, the addition amount of the antimony-based catalyst is 170ppm, and the addition amount of the matting agent is 1.13% of the mass of the polyester produced from the raw material.

[0056] Step 3: The mixed slurry is transported to the esterification tank, and ethylene glycol is used for alcoholysis at 210-270° C., and the recycled material powder undergoes alcoholysis reaction, and the residence time of alcoholysis ...

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Abstract

The invention discloses a low-energy-consumption and high-benefit polyester waste chemical cyclic utilization method, which comprises the following steps: firstly, crushing waste polyester into cyclic material powder through a specific crusher, then uniformly mixing the cyclic material powder with PTA (pure terephthalic acid) and ethylene glycol to form slurry, feeding the slurry into an esterification reaction kettle through an original material pipeline, and synchronously carrying out an alcoholysis reaction on the circulating material powder and an esterification reaction on the primary raw material, and carrying out polycondensation on a mixture of an alcoholysis product of the circulating material powder and an esterification product of the primary raw material to obtain the final target polyester. According to the invention, the waste polyester is crushed into circulating material powder, so that the air entrainment amount is obviously reduced; through the pulping process of the circulating material powder and the original raw material, removal of air entrained in the powder and nitrogen replacement are easy to realize, and it is ensured that various indexes of subsequent polyester products reach the standard and are kept stable; and as screw melting feeding is not needed, energy consumption is obviously reduced, the phenomenon that the melt is in contact with air at a high temperature and is oxidized and degraded is avoided, and the product quality is improved.

Description

technical field [0001] The invention relates to the field of waste polyester regeneration and polyester synthesis technology, in particular to a low-energy, high-efficiency waste polyester chemical recycling method based on a new type of continuous feeding of recycled raw materials. Background technique [0002] While polyester products bring convenience to life, a large amount of waste polyester is buried, incinerated or discarded as garbage, which has brought enormous pressure to the environment and brought great hidden dangers to the sustainable development of the industry. Obviously, the recovery and recycling of waste polyester is an urgent problem to be solved. [0003] For the recycling of waste polyester, there are mainly two categories: physical method and chemical method. Chemical methods, specifically including BHET and DMT processes. Its advantage is that the product quality after recycling is high, but it is difficult to popularize due to problems such as larg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183C08G63/78C08K3/22D01F6/92D01F1/10
CPCC08G63/183C08G63/78C08K3/22D01F6/92D01F1/10C08K2003/2241
Inventor 李圣军肖顺立唐越超楼梦娜赵晨霞王读彬
Owner ZHEJIANG TONGKUN NEW MATERIALS RES INST CO LTD
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