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Waste polyester-cotton textile degrading and recycling process and system

A recycling system and textile technology, applied in the field of polyester and cotton recycling, can solve the problems of continuous reaction of separation methods, inconvenient recycling, poor product purity, etc., and achieve the effects of alleviating resource shortage, reducing pollution and high purity

Pending Publication Date: 2017-03-22
深圳恒锋资源股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But above-mentioned these methods, because the reaction mechanism of separation of different components is not identical, and different separation methods can not be carried out by continuous reaction, often just dissolve and separate one kind of composition in the prior art, and use the remainder as another kind of composition, Each component is not separated separately, resulting in poor purity of the final product, which is not convenient for recycling

Method used

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  • Waste polyester-cotton textile degrading and recycling process and system
  • Waste polyester-cotton textile degrading and recycling process and system
  • Waste polyester-cotton textile degrading and recycling process and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A process for the degradation and recycling of waste polyester-cotton textiles includes the following steps:

[0038] A. Crush waste polyester / cotton textiles into 2cm cloth strips as raw materials;

[0039] B. Add 80% concentrated phosphoric acid to the raw materials, the mass ratio of the concentrated phosphoric acid to the raw materials is 4:1, and react at 80℃ for 0.5h under stirring. After the reaction is completed, filter to obtain filtrate I and filtrate Ⅰ;

[0040] C. Take the filtrate I and add water and stir for hydrolysis. The volume ratio of the added water to the filtrate I is 3:1; use polyester fiber as a filter to filter the filtrate to obtain filtrate II, which is Cotton fiber;

[0041] D. Take the filtrate I, add 25% sodium hydroxide solution, the mass ratio of sodium hydroxide solution to filtrate I is 3:1, react at 100℃ for 4h, filter after reaction, take the filtrate to filter Liquid II;

[0042] E. Take the filtrate II and add water and stir for dilution. ...

Embodiment 2

[0047] A process for the degradation and recycling of waste polyester-cotton textiles includes the following steps:

[0048] A. Crush waste polyester-cotton textiles into 8cm cloth strips as raw materials;

[0049] B. Add 75% concentrated phosphoric acid to the raw materials, the mass ratio of concentrated phosphoric acid to the raw materials is 6:1, and react at 70°C for 1.5 hours under stirring. After the reaction is completed, filter to obtain filtrate I and filtrate Ⅰ;

[0050] C. Take the filtrate I and add water and stir for hydrolysis. The volume ratio of the added water to the filtrate I is 3:1; use polyester fiber as a filter to filter the filtrate to obtain filtrate II, which is Cotton fiber;

[0051] D. Take the filtrate I, add 20% sodium hydroxide solution, the mass ratio of sodium hydroxide solution to filtrate I is 5:1, react at 90℃ for 6h, filter after the reaction, take the filtrate to filter Liquid II;

[0052] E. Take the filtrate II and add water and stir for dilut...

Embodiment 3

[0057] A process for the degradation and recycling of waste polyester-cotton textiles includes the following steps:

[0058] A. Crush waste polyester-cotton textiles into 5cm strips as raw materials;

[0059] B. Add 78% of concentrated phosphoric acid to the raw material, the mass ratio of concentrated phosphoric acid to the raw material is 5:1, react for 1 hour at 75°C under stirring, and filter after the reaction is completed to obtain filtrate I and filtrate I ;

[0060] C. Take the filtrate I and add water and stir for hydrolysis. The volume ratio of the added water and filtrate I is 3:1; use the polypropylene fiber as the filter to filter out the filtrate to obtain filtrate II, which is Cotton fiber;

[0061] D. Take the filtrate I, add 22% sodium hydroxide solution, the mass ratio of sodium hydroxide solution to filtrate I is 4:1, react at 95℃ for 5h, filter after the reaction, take the filtrate to filter Liquid II;

[0062] E. Take the filtrate II and add water and stir for di...

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Abstract

The invention relates to a waste polyester-cotton textile degrading and recycling process and system. According to the waste polyester-cotton textile degrading and recycling process, high-concentration phosphoric acid and cotton fibers in polyester-cotton are reacted at first, water-soluble cellulose phosphate ester is generated, and primary separation of polyester and the cotton fibers is completed; then the cotton fibers are separated out through hydrolysis, and pure cotton fibers are obtained; and alkali liquor is added into reaction liquid subjected to acidolysis for alkaline hydrolysis, water-soluble sodium terephthalate is generated through sodium hydroxide and the polyester and further hydrolyzed to generate terephthalic acid, the obtained terephthalic acid is subjected to direct esterification through ethanediol, polyethylene glycol terephthalate, namely PET is obtained, and subsequent cyclic utilization is facilitated. Through the waste polyester-cotton textile degrading and recycling system, the waste polyester-cotton textile degrading and recycling process can be completely efficiently, and the cotton fibers and the polyethylene glycol terephthalate which are high in purity and facilitate subsequent cyclic utilization are obtained.

Description

Technical field [0001] The invention belongs to the technical field of polyester-cotton recycling, and specifically relates to a process and system for the degradation and recycling of waste polyester-cotton textiles. Background technique [0002] Since the beginning of the 21st century, with the rapid development of economy, industry and population, the available natural resources have been declining day by day. At the same time, environmental pollution caused by the improper disposal of greenhouse gases, pollutants and solid waste from fossil fuel combustion has become increasingly serious. Therefore, while countries around the world are seeking renewable new energy sources, the treatment of solid waste has shifted from landfill, incineration, or simple recycling and disposal to full-component recycling or high-value-added resource utilization. [0003] China produces more than 40 million tons of fiber each year, of which polyester, cotton and their blended fabrics account for m...

Claims

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Application Information

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IPC IPC(8): C08J11/16C08J11/14C08L1/02C08G63/183
CPCC08G63/183C08J11/14C08J11/16C08J2301/02Y02W30/62
Inventor 罗洪坚
Owner 深圳恒锋资源股份有限公司
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