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Method for preparing fiber-grade polyester chip capable of being applied to processing of textile from waste braided fabric

A technology for polyester chips and waste textiles, which is applied in the field of fiber-grade polyester chips, can solve the problems of inability to realize high-grade recycling of waste textiles, environmental pollution, and difficulty in obtaining them, so as to improve the level of efficient recycling and utilization. Efficient industrial chain circulation and the effect of suppressing by-products

Active Publication Date: 2017-09-22
SHUYE ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] According to the above data, in 2016, although some progress has been made in the construction of the domestic waste textile recycling and comprehensive utilization industry chain, the total recycling and recycling of waste textiles is only 2.7 million tons, accounting for 5.02% of the total fiber processing in the textile industry that year. , the proportion of recycling and recycling applications is still low, resource waste and environmental pollution caused by waste textiles are still serious, and there is a huge space for recycling and utilization
[0005] At present, the relatively mature process route for the recycling of waste polyester materials in China is the recycling process of waste polyester bottles. This process is mainly based on physical methods and supplemented by chemical methods. The cost of waste beverage bottles required for raw materials is high and not easy. get
[0006] Other domestic enterprises have also tried the regeneration process route using waste textiles as raw materials. The main process is pre-sorting, then melting and extruding, and then re-condensation and granulation after simple filtration. From the perspective of the operation process, the pre-sorting of this method This increases the labor cost, and the impurity cannot be completely removed in the following process. There is a problem that the purity of the recycled PET is poor due to the incomplete reduction step. According to the customer's processing requirements, the existing process route cannot realize high-level recycling of waste textiles

Method used

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  • Method for preparing fiber-grade polyester chip capable of being applied to processing of textile from waste braided fabric

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A method for preparing fiber-grade polyester chips applicable to textile processing from waste textiles, comprising the steps of:

[0046] 1) Pre-pulverize waste textiles into flakes;

[0047] 2) Add the pre-crushed flakes into the alcoholysis device, add triethylene glycol at a mass ratio of 1:2, add the initiator, and keep stirring for 1 hour at 190°C and a pressure of 0.1MPa to obtain crude BHET solution;

[0048] 3) Filtrate and separate the solid waste impurities in the crude BHET solution; obtain a preliminary purified crude BHET solution;

[0049] 4) cooling and crystallizing the obtained preliminary purified crude BHET solution to obtain a crude BHET suspension;

[0050] 5) Obtain the crude BHET cake and separate the triethylene glycol solution containing impurities by pressing the crude BHET suspension;

[0051] 6) Add 25% ethylene glycol by volume to the crude BHET cake, heat to 60°C, add adsorption decolorizer and stir thoroughly at the same time to obtain...

Embodiment 2

[0084] A method for preparing fiber-grade polyester chips applicable to textile processing from waste textiles, comprising the steps of:

[0085] 1) Pre-pulverizing waste textiles into flakes;

[0086] 2) Add the pre-crushed flakes into the alcoholysis device, add triethylene glycol at a mass ratio of 1.25, add the initiator, and keep stirring for 4 hours at 260°C and a pressure of 0.4MPa to obtain crude BHET solution;

[0087] 3) Filtration and separation of solid waste impurities in the crude BHET solution; obtain preliminary purified crude BHET;

[0088] 4) cooling and crystallizing the obtained preliminary purified crude BHET solution to obtain a crude BHET suspension;

[0089] 5) obtaining the crude BHET cake and separating the triethylene glycol solution containing impurities by pressing the crude BHET suspension;

[0090] 6) Add 85% ethylene glycol by volume to the crude BHET cake, heat to 150°C, add adsorption decolorizing agent and stir thoroughly to obtain BHET mi...

Embodiment 3

[0108] A method for preparing fiber-grade polyester chips applicable to textile processing from waste textiles, comprising the steps of:

[0109] 6) Pre-pulverizing waste textiles into flakes;

[0110] 7) Put the pre-crushed flakes into the alcoholysis device, add triethylene glycol at a ratio of 1:1.5 by mass, add the initiator, and keep stirring for 3 hours at 200°C and a pressure of 0.25MPa to obtain crude BHET solution;

[0111] 8) Filtration and separation of solid waste impurities in the crude BHET solution; obtain preliminary purified crude BHET;

[0112] 9) cooling and crystallizing the obtained preliminary purified crude BHET solution to obtain a crude BHET suspension;

[0113] 10) obtaining the crude BHET cake and separating the triethylene glycol solution containing impurities by pressing the crude BHET suspension;

[0114] 6) Add 60% ethylene glycol by volume to the crude BHET cake, heat to 100°C, add adsorption and decolorization agent and stir thoroughly to ob...

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Abstract

The invention provides a method for preparing a fiber-grade polyester chip capable of being applied to the processing of a textile from waste braided fabric. A waste textile is subjected to crushing, alcoholysis, filtration, separation, cooling crystallization, squeezing, decoloration, rectification purification, preheating, prepolycondensation, polycondensation and cooling strip casting, and then is cut into particles; through reducing the waste textile to be high-purity bis(2-hydroxyethyl)terephthalate (hereinafter referred to as BHET for short), the fiber-grade polyester chip applied to the processing of the textile is prepared anew; the high-efficiency recovery is realized.

Description

technical field [0001] The invention relates to a method for recycling waste polyester materials, which realizes high-grade recycling through chemical means, and in particular relates to a method for re-preparing waste textiles into fiber-grade polyester chips that can be used in textile processing. Background technique [0002] Waste textiles mainly exist in the form of waste clothing and chemical fiber cloth scraps from garment factories. The main component of waste clothes and chemical fiber cloth scraps is polyethylene terephthalate. The chemical abbreviation of polyester is PET (hereinafter referred to as Polyester) is a high molecular organic chemical. Due to the lack of high-level recycling application methods, waste textiles mainly in the form of waste clothes are landfilled with domestic waste. Due to the inertia of polyester itself, it takes 200 to 600 years for spontaneous degradation in nature. Moreover, while spontaneously degrading, the coloring dyes attached ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183C08G63/78C07C67/00C07C69/82D01F6/62
CPCC07C67/00C08G63/183C08G63/78D01F6/62C07C69/82B29B9/065B29B9/12B29B2009/165C08J11/24C08J2367/02Y02W30/62B29B17/0412B29K2067/003B29K2105/26C08G63/866
Inventor 林树光董兴广罗俊生周郑奇
Owner SHUYE ENVIRONMENTAL TECH CO LTD
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