Resourced recovering and utilizing method for waste cotton fabric

A technology for recycling cotton fabrics, applied in the field of recycling waste cotton fabrics, can solve the problems that the purity of recycled polyester cannot reach 100%, the separation of cellulose and polyester, and the separation effect is not ideal, etc., and achieves low crystallinity and environmental protection. Low pollution and energy saving effect

Inactive Publication Date: 2013-02-06
SICHUAN AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main properties of the polyester recovered by this method have no significant changes, and the recovered cotton cellulose can be used as chemical products or chemical raw materials, and can also be re-spun to produce high-quality regenerated cellulose fibers, but the separation effect of this method is not ideal, and Cellulose and polyester cannot be completely separated, and the purity of recycled polyester cannot reach 100%, and the amount of solvent required to process a unit mass of cotton fabric is relatively large, and the process is complicated, resulting in low processing efficiency and high processing costs

Method used

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  • Resourced recovering and utilizing method for waste cotton fabric

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0031] Example 1: Phosphoric acid with different mass fraction concentrations is used for recycling waste cotton fabrics

[0032] (1) Raw materials

[0033] 1. Poly-cotton blend fabric, from 20 pairs of discarded jeans from different brands.

[0034] 2. Cellulase (Celluclast 1.5L) and β-glucosidase (Novozyme 188) were purchased from Novozymes.

[0035] (2) Method 1. Pulverize the mixed jeans and put them into the reactor, then add phosphoric acid with a mass fraction of 82%, 83%, and 86% into the reactor, and keep the solid-to-liquid ratio at 1: 20. Start the reaction after keeping the temperature constant at 50°C, and the reaction time is 18h.

[0036] 2. Filter the reacted solution with a 30-mesh sieve, rinse the undissolved polyester on the sieve with water, and drain the rinse and filtrate into the agitator. Dry the rinsed polyester for later use.

[0037]The main principle in the reaction process is that the cotton fiber in the raw material and concentrated phosphoric...

example 2

[0042] Example 2: Recycling of waste cotton fabrics with different phosphoric acid additions

[0043] (1) Raw materials

[0044] 1. Poly-cotton blend fabric, from 20 pairs of discarded jeans from different brands.

[0045] 2 Cellulase (Celluclast 1.5L) and β-glucosidase (Novozyme 188) were purchased from Novozymes.

[0046] (2) Method

[0047] 1. Pulverize the mixed jeans and put them into the reactor, then add phosphoric acid with a mass fraction of 85% into the reactor to make the solid-liquid ratio 1:10, 1:15, 1:30, and keep the temperature constant The reaction starts after 50°C, and the reaction time is 7h.

[0048] 2. Filter the reacted solution with a 30-mesh sieve, rinse the undissolved polyester on the sieve with water, and drain the rinse and filtrate into the agitator. Dry the rinsed polyester for later use.

[0049] 3. Add water twice the volume of phosphoric acid into the mixer and stir for 2 minutes to regenerate the cellulose. Filter the solution with a fi...

example 3

[0053] Example 3: Different reaction temperatures for waste cotton fabric recovery

[0054] (1) Raw materials

[0055] 1. Poly-cotton blend fabric, from 20 pairs of discarded jeans from different brands.

[0056] 2 Cellulase (Celluclast 1.5L) and β-glucosidase (Novozyme 188) were purchased from Novozymes.

[0057] (2) Method

[0058] 1. After the mixed jeans are pulverized by a pulverizer, put them into the reactor, and then add phosphoric acid with a mass fraction of 85% to the reactor to make the solid-liquid ratio 1:15, and keep the temperature constant at 45, 50, and 60°C Start the reaction, the reaction time is 6h.

[0059] 2. Filter the reacted solution with a 30-mesh sieve, rinse the undissolved polyester on the sieve with water, and drain the rinse and filtrate into the agitator. Dry the rinsed polyester for later use.

[0060] 3. Add water twice the volume of phosphoric acid into the mixer and stir for 2 minutes to regenerate the cellulose. Filter the solution w...

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Abstract

The invention relates to a resourced recovering and utilizing method for waste cotton fabric, in particular to a technology for recovering polyester and cotton fiber from waste polyester cotton blended fabric and using the polyester and the cotton fiber during the production of fermentable sugar, and belongs to the field of resourced cycling and reutilizing of solid waste. According to the resourced recovering and utilizing method, concentrated phosphoric acid is used as a solvent, a reaction is conducted under the conditions that the mass fraction of the phosphoric acid is 82 to 86 percent, the solid-liquid ratio is 1:10 to 1:30, the reaction temperature is 45 to 60 DEG C, and the reaction time is 2 to 18 hours; the cotton fiber in the polyester cotton blended fabric is completely dissolved, so as to enable the polyester to be isolated and recovered by one hundred percent; then water is added to a solution to dilute the solution, so as to enable cellulose to be regenerated and obtain regenerative cellulose with a low cleanliness degree and a low polymerization degree, which is applicable to enzymatic hydrolysis; and after the regenerative cellulose is subjected to the enzymatic hydrolysis, the fermentable sugar is generated to be used as a carbon source for fermenting and producing bio-based products. Waste liquid is distilled and the concentrated phosphoric acid is recovered to be circularly used. The resourced recovering and utilizing method is applicable to the polyester cotton blended fabric formed in any proportion, has the advantage of relatively low energy consumption and is simple to operate; and the polyester can be recovered by one hundred percent, the concentrated phosphoric acid can be simultaneously recovered to reduce costs, and the cotton fiber component is utilized to produce bio-based sources or bio-based products.

Description

technical field [0001] The invention relates to a method for resource utilization of waste cotton fabrics, in particular to a method for recycling cotton fibers in waste polyester-cotton blended fabrics to produce fermentable sugar and simultaneously recovering high-purity polyester. technical background [0002] Since entering the 21st century, with the rapid development of economy, industry and population, the available natural resources are decreasing day by day. At the same time, environmental pollution caused by greenhouse gases and pollutants emitted by fossil fuel combustion and improper disposal of solid waste is also becoming more and more serious. Therefore, while countries around the world are seeking renewable new energy, the treatment of solid waste has shifted from landfill, incineration or simple recycling to full component recycling or high value-added resource utilization. [0003] China produces and processes more than 40 million tons of fiber each year, o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/04C08L1/02C08L67/00C12P19/14C12P19/02
CPCY02W30/62Y02P20/143
Inventor 沈飞肖文雄邓仕槐张延宗蔺丽丽杨刚彭宏李远伟
Owner SICHUAN AGRI UNIV
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