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Waste textile degradation method

A waste textile and waste technology, applied in the field of waste textile degradation, can solve the problems of high energy consumption, low depolymerization monomer yield and selectivity, long reaction time, etc., and achieve the effect of easy purification

Pending Publication Date: 2021-12-31
FOSHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the existing chemical methods such as glycolysis and hydrolysis of waste polyester textiles have relatively detailed shortcomings: high energy consumption (high temperature, high pressure), long reaction time (in hours), and depolymerization. The yield and selectivity of the body are relatively low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for degrading waste textiles, comprising the steps of:

[0031] 1) Cut waste textiles (containing 100% polyester) into random fragments, weigh 2g of the fragments and add them to a zirconia tank (refer to figure 1 a), then add 0.2g sodium hydroxide, 0.5mL dimethyl sulfoxide and 1 zirconia ball, then place the zirconia tank in the ball mill, set the grinding frequency to 10Hz, and grind for 18 minutes Grinding to obtain the grinding product (refer to figure 1 b);

[0032] 2) Use ultrapure water to wash the grinding product 3 times, suction filter, and the filtrate (refer to figure 1 c) add the hydrochloric acid of mass fraction 10%, stir, suction filtration, collect white precipitate (refer to figure 1 d) drying in an oven at 80°C for 30 minutes to obtain the degradation product.

[0033] The degradation product obtained in this example was subjected to nuclear magnetic resonance spectrum analysis. Such as figure 2 As shown in the hydrogen spectrum of (a)...

Embodiment 2

[0036] A method for degrading waste textiles, comprising the steps of:

[0037] 1) Cut waste textiles (containing 70% polyester) into random fragments, weigh 0.75g fragments and add them to a zirconia tank, then add 0.1g sodium hydroxide, 0.4mL isopropanol and 1 zirconia ball, and then put The zirconia jar is placed in a ball mill, the frequency of grinding is set to 13 Hz, and the grinding time is 13 minutes for grinding to obtain a grinding product;

[0038] 2) Wash the grinding product 3 times with ultrapure water, filter with suction, add 10% hydrochloric acid to the filtrate, stir, filter with suction, collect the white precipitate, and dry it in an oven at 80°C for 30 minutes to obtain the degradation product.

[0039] It is calculated that the conversion rate of the polyester in this embodiment is 100%, and the yield of terephthalic acid is 92%.

Embodiment 3

[0041] A method for degrading waste textiles, comprising the steps of:

[0042]1) Cut waste textiles (containing 30% polyester) into random fragments, weigh 1.8g fragments and add them to a zirconia tank, then add 0.15g sodium hydroxide, 0.45mL N,N-dimethylformamide and 1 a zirconia ball, then place the zirconia jar in a ball mill, set the frequency of grinding to be 10 Hz, and grind for 15 minutes to obtain a grinding product;

[0043] 2) Wash the grinding product 3 times with ultrapure water, filter with suction, add 10% hydrochloric acid to the filtrate, stir, filter with suction, collect the white precipitate, and dry it in an oven at 80°C for 30 minutes to obtain the degradation product.

[0044] It is calculated that the conversion rate of the polyester in this embodiment is 100%, and the yield of terephthalic acid is 94%.

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Abstract

The invention relates to the technical field of textiles, and discloses a waste textile degradation method. The degradation method comprises the steps of: mixing waste textiles with a catalyst, and grinding the mixture to obtain a degradation product. The catalyst comprises an organic reagent and alkali, and the degradation product comprises terephthalic acid. According to the method, the waste textiles, the organic reagent and the alkali are mixed and ground, and react for less than 20 minutes under the conditions of normal temperature and normal pressure, the waste textiles with different polyester contents can be depolymerized, the conversion rate of polyester reaches 100%, the yield of terephthalic acid as the degradation product is greater than 92%, the defects of high temperature, high pressure, supercritical and other harsh conditions and long consumed time in the existing degradation technology are overcome, and the final degradation product is easy to purify.

Description

technical field [0001] The invention relates to the technical field of textiles, in particular to a method for degrading waste textiles. Background technique [0002] There are about 70 million tons of polyethylene terephthalate (PET) products in the world every year, 80% of which are produced in textiles, 20% are produced in beverage bottles, and the latter are recycled to produce fibers and textiles. The high yield in the production of polyester textiles also means a high yield in waste. According to the latest data from the National Bureau of Statistics, the output of chemical fiber in 2020 will be 60.2512 million tons, of which the output of polyester fiber will be 49.2275 million tons, accounting for more than 80%, and a year-on-year increase of 3.89%. Waste textiles are mostly incinerated or landfilled as garbage, which takes up a lot of resources and is easy to cause secondary pollution, posing a serious threat to the natural environment and human health. Polyester ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C63/26C07C51/09
CPCC07C51/09C07C63/26Y02P20/54Y02W30/62
Inventor 袁文兵蔡舒涵陈忻杨希贤刘德飞吕道飞颜健许锋陈晓刚
Owner FOSHAN UNIVERSITY