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Method for separating and recycling waste polyester-cotton textiles by organic acid-catalyzed hydrothermal reaction

A technology of organic acid catalyst and hydrothermal reaction, which is applied in the direction of plastic recycling and recycling technology, which can solve the problems of burden and harm, and achieve the effect of high-efficiency separation and advanced process

Active Publication Date: 2022-02-11
THE HONG KONG RES INST OF TEXTILES & APPAREL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it is undeniable that the current technology has some shortcomings no matter which way it is, including involving the use of more harmful chemicals, such as: hydrochloric acid (US Patent No.4345039) and tetramethylene sulfone (US Patent No. 5342854), etc., or need to use a large amount of expensive solvents, such as: NMMO, ionic liquid (WO Patent No.2014081291 A1), and DMT (CN Patent No.2014081291 A1), etc., these problems will inevitably make cost control and environmental protection Protection creates a burden

Method used

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  • Method for separating and recycling waste polyester-cotton textiles by organic acid-catalyzed hydrothermal reaction
  • Method for separating and recycling waste polyester-cotton textiles by organic acid-catalyzed hydrothermal reaction
  • Method for separating and recycling waste polyester-cotton textiles by organic acid-catalyzed hydrothermal reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 15g of waste and old white shirt uniforms with a polyester / cotton ratio of 65 / 35 were placed in 1.8L of an aqueous solution with a citric acid content of 5%. Under stirring conditions, the autoclave was heated up to Maintain at 130°C for 1.5 hours to carry out the degradation reaction of cotton fibers.

[0046] After the reaction is over, turn off the electric heater, and after the reactor is cooled to room temperature, open the reactor and take out the reaction product.

[0047] Filter the reaction product through a sieve to obtain polyester fiber aggregates, then vacuum-filter the remaining mixed solution through a filter membrane to obtain cotton fiber fragments, and then wash the two separately and dry them in a blast oven to constant weight to obtain polyester fibers The recovery rate of fiber aggregates was 98%, and the recovery rate of cotton fiber chips was 83%.

Embodiment 2

[0049] Put 17 g of waste bed sheets with a polyester / cotton ratio of 20 / 80 in 1.5 L of an aqueous solution with a methanesulfonic acid content of 1%, and raise the temperature of the autoclave to 140 °C at a heating rate of 6 °C / min and maintain it for 1 h. Degradation reactions of cotton fibers.

[0050] After the reaction is over, turn off the electric heater, and after the reactor is cooled to room temperature, open the reactor and take out the reaction product.

[0051] Filter the reaction product through a sieve to obtain a polyester fiber aggregate, then vacuum-filter the remaining mixed solution through a filter membrane to obtain cotton fiber fragments, wash the two separately and dry them in a blast oven to constant weight, and the obtained polyester fiber The recovery rate of aggregates was 99%, and the recovery rate of cotton fiber chips was 81%.

[0052] In summary, the hydrothermal reaction catalyzed by an organic acid to separate and recycle waste polyester-cott...

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Abstract

The invention provides a method for separating and reclaiming waste polyester-cotton textiles by hydrothermal reaction catalyzed by organic acids, comprising the following steps: dividing waste and old polyester-cotton textiles into pieces, and dispersing them in an aqueous solution system of organic acid catalysts to obtain a mixed system; In the high-pressure reactor, the temperature of the mixing system is raised to 110-180° C., so that the cotton fibers in the waste polyester-cotton textiles are degraded for 0.5-3 h to obtain a mixture; and the mixture is filtered through a screen, and washed to obtain a mixture. Polyester fiber aggregates, and then the remaining part is vacuum filtered through a filter membrane, and cotton fiber fragments are obtained after cleaning. The process of the method of the invention is advanced and simple, the catalyst used in the process comes from nature and can be biodegraded, does not decompose during the process, does not cause pollution to the environment, and can efficiently realize the separation of waste polyester and cotton textiles , recycling and reuse.

Description

technical field [0001] The invention relates to the field of regeneration of textile resources, in particular to a method for separating and recycling waste polyester-cotton textiles through hydrothermal reaction catalyzed by organic acids. Background technique [0002] As the world's population continues to grow coupled with rapid changes in fashion trends, resulting in more and more textile waste, polyester fiber is one of the most commonly used fibers, especially for the manufacture of polyester-cotton blended textiles and the like. However, polyester fiber is a material that is difficult to degrade naturally, and it is easy to have adverse effects on the environment after being discarded. From the perspective of environmental protection and resource conservation, recycling is one of the most ideal ways to deal with such waste products. [0003] To achieve a perfect recycling effect, the first thing is to properly separate the two different types of fibers in the waste p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J11/10C08J11/14C08L67/00C08L1/02
CPCC08J11/10C08J11/14C08L1/02C08L67/00C08J2301/02C08J2367/00Y02W30/62
Inventor 葛仪文姚磊廖骁刘洋卓嘉良陈学聪
Owner THE HONG KONG RES INST OF TEXTILES & APPAREL