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Recycling method of squeezed waste alkali liquor generated in viscose fiber production

A viscose fiber, waste lye technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, heating water/sewage treatment, etc. Conducive to energy saving and emission reduction, saving caustic soda and environmental protection

Pending Publication Date: 2021-06-25
HENAN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the membrane separation method is actually a process of concentrating hemicellulose in an aqueous alkali solution, which cannot completely recover and recycle the spent alkali liquor, and at least 30-50% of the spent alkali liquor must be treated by traditional methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. Pass viscose fiber waste lye (containing about 4% hemicellulose and 20% sodium hydroxide by mass percentage) into the precipitation reactor, add hemicellulose precipitant, mix well, and let it stand for a period of time. After the solution is clearly stratified, the supernatant is passed into the middle tank, and the supernatant is removed to obtain a hemicellulose slurry.

[0023] 2. Put the hemicellulose slurry into the solid-liquid separator for hemicellulose separation, wash and dry the solid hemicellulose, weigh and calculate the hemicellulose removal rate. The filtrate and washing liquid are aqueous solutions containing precipitating agent and sodium hydroxide, which are passed into the intermediate tank and combined with the supernatant.

[0024] 3. Pass the aqueous solution containing precipitant and sodium hydroxide into the rectification tower, and realize the separation of alkali liquor and precipitant in the rectification tower. The precipitant is discha...

Embodiment 2

[0027] Step is with embodiment 1.

[0028] The above-mentioned hemicellulose precipitant is an aqueous solution composed of methanol and polyferric sulfate in a ratio of 1000:1 by weight.

Embodiment 3

[0030] Step is with embodiment 1.

[0031] The above-mentioned hemicellulose precipitant is an aqueous solution compounded by mixing high-efficiency solvents and polyferric sulfate at a ratio of 1000:1 by weight.

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PUM

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Abstract

The invention belongs to the field of resource reutilization, and relates to a waste alkali liquor utilization method, in particular to a recycling method of waste alkali liquor in the viscose fiber production process of a chemical fiber factory. According to the method, the hemicellulose is separated from the waste alkali liquor through a reaction unit, a solid-liquid separation unit, a rectification unit, a solid drying unit and a liquid recovery unit, the waste alkali liquor can be completely recovered and recycled, meanwhile, the byproduct hemicellulose can be obtained, the hemicellulose can be used as a raw material for producing furfural or xylose, and the additional value of waste liquid treatment is increased. Energy conservation and emission reduction are facilitated, environmental pollution is reduced, a large amount of caustic soda can be saved, and environmental protection is facilitated.

Description

technical field [0001] The invention belongs to resource reuse, in particular to a method for recycling waste lye in the viscose fiber production process of a chemical fiber factory. Background technique [0002] Viscose fiber is one of the main chemical fiber varieties, and its output accounts for about one-third of the total global fiber output. It is estimated that my country's viscose fiber production capacity is about 3 million tons, and the annual output of viscose fiber accounts for about 60% of the world's total output. With the development of the global economy and the growth of population, the consumption of viscose fiber will continue to grow. The production process of viscose fiber includes 4 stages of viscose preparation, spinning, post-processing and post-processing. In the process of viscose preparation, a large amount of caustic soda is consumed and a large amount of waste lye is produced. The main components are water, NaOH And hemicellulose, in which the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
CPCC02F1/04C02F1/54C02F1/56C02F1/5236
Inventor 胡元森王天贵卫冉段定康朱广有卫红伟潘茜
Owner HENAN UNIVERSITY OF TECHNOLOGY
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