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Method for separating and recovering waste cotton-polyester blended fabric under subcritical water condition

A polyester-cotton blended, subcritical water technology is applied in the field of separation and recycling of waste polyester-cotton fabrics, which can solve the problems of inability to separate cotton fibers and polyester fibers, unsatisfactory separation effect, and high recycling cost, and achieves less environmental pollution and less corrosiveness. , the effect of reducing energy consumption

Active Publication Date: 2017-05-17
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main properties of the polyester fibers recovered by these methods have not changed significantly, but the separation effect is not ideal, and the cotton fibers and polyester fibers cannot be completely separated, and most of the processes are complicated, resulting in low processing efficiency and high recycling costs

Method used

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  • Method for separating and recovering waste cotton-polyester blended fabric under subcritical water condition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: the dilute hydrochloric acid of different mass fraction concentration is used for the recycling of waste polyester-cotton blended fabric

[0030] (1) Raw materials

[0031] 1. Waste polyester-cotton blended fabric, the blending ratio is 65:35;

[0032] 2. Hydrochloric acid and ferric chloride;

[0033] (2) Method

[0034] 1. Crush waste polyester-cotton blended fabrics into materials, add hydrochloric acid solutions with mass fractions of 0.5%, 1%, 1.5%, 2%, and 2.5% respectively, and keep the solid-liquid ratio at 1:25, and keep the temperature constant at 150 ℃ to start the reaction, the reaction time is 5h.

[0035] 2. Stir the reacted solution, and filter it with a medium-speed filter paper, wash the solid product on the sieve with water and alcohol for several times, rinse it and dry it for use.

[0036] The principle in the reaction process is that cotton fiber is a cellulose fiber formed by cellulose macromolecules, and the 1-4β glycoside bonds ...

Embodiment 2

[0039] Embodiment 2: Different reaction times are used for the recycling of waste polyester-cotton blended fabrics

[0040] (1) Raw materials

[0041] 1. Waste polyester-cotton blended fabric, the blending ratio is 75:25;

[0042] 2. Hydrochloric acid and ferric chloride.

[0043] (2) Method

[0044] 1. Crush the waste polyester-cotton blended fabric into materials, add hydrochloric acid solution with a mass fraction of 0.5% and 0.3g ferric chloride respectively, and keep the solid-liquid ratio at 1:25, keep the temperature constant at 150°C to start the reaction, and the reaction time It is 2h, 3h, 4h, 5h, 6h.

[0045] 2. Stir the reacted solution, and filter it with a medium-speed filter paper, wash the solid product on the sieve with water and alcohol for several times, rinse it and dry it for use.

[0046] (3) Experimental results

[0047] It was determined that after the reaction time was 2h, 3h, 4h, 5h, and 6h, the recovery rate of polyester reached 100%, and the yi...

Embodiment 3

[0048] Embodiment 3: Different reaction temperatures are used for the recycling of waste polyester-cotton blended fabrics

[0049] (1) Raw materials

[0050] 1. Waste polyester-cotton blended fabric, the blending ratio is 75:25.

[0051] 2. Hydrochloric acid and ferric chloride

[0052] (2) Method

[0053] 1. Crush the waste polyester-cotton blended fabric into materials, add hydrochloric acid solution with a mass fraction of 1% and 0.2g ferric chloride respectively, and keep the solid-liquid ratio at 1:25, and keep the temperature constant at 130°C, 140°C, 150°C ℃, 160℃, 170℃, and the reaction time is 5h.

[0054] 2. Stir the reacted solution, and filter it with a medium-speed filter paper, wash the solid product on the sieve with water and alcohol for several times, rinse it and dry it for use.

[0055] (3) Experimental results

[0056] It was determined that after the reaction temperatures were 130°C, 140°C, 150°C, 160°C, and 170°C, the recovery rates of polyester reac...

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Abstract

The invention discloses a method for separating and recovering waste cotton-polyester blended fabric under a subcritical water condition, and belongs to the field of resource recycling and reuse of waste fabric. Under the conditions that the mass fraction of hydrochloric acid is 0.5-2% and reaction temperature is 130-160DEG C, reaction is carried out for 3-5h, cotton fibers in the waste cotton-polyester blended fabric are decomposed into microcrystalline celluloses, but polyester fibers are not changed, and therefore, the polyester fibers and the microcrystalline celluloses are separated and recovered. The method is suitable for the cotton-polyester blended fabric formed at any ratio and has the advantages of simpleness in operation, short technological process, low energy consumption, light environment pollution and the like.

Description

technical field [0001] The invention relates to a method for separating and recycling waste polyester-cotton fabrics, and belongs to the technical field of recycling waste polyester-cotton fibers and preparing chemical substances. Background technique [0002] Nowadays, people's living and consumption levels are constantly improving, the service life of textiles is shortening sharply, and waste textiles are increasing year by year. However, the continuous increase in the use of textile raw materials has caused many problems such as a sharp decrease in the area of ​​cultivated land and an increase in the price of raw materials. "Grain and cotton competition for land" has become a social problem that cannot be ignored. At the same time, the recycling efficiency of waste textiles produced by replacement is extremely low. Caused a great waste of resources. If the comprehensive utilization rate of waste textiles in my country reaches 60%, 18.8 million tons of crude oil and 1.0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/14C08J11/16C08L1/04C08L67/02
CPCC08J11/14C08J11/16C08J2301/04C08J2367/02C08J2401/04C08J2467/02Y02W30/62
Inventor 侯文生阎智锋史晟张美玲王淑花戴晋明
Owner TAIYUAN UNIV OF TECH
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