Process for secondary treating of waste alkali liquid during production of viscose fibers

A viscose fiber and secondary treatment technology is applied in the field of viscose fiber to achieve the effects of reducing environmental pollution, improving ecological benefits and low energy consumption

Inactive Publication Date: 2013-02-27
YIBIN HIEST FIBER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to solve the problem of secondary waste lye treatment, by treating the waste lye that remains after recycling, instead ...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A secondary treatment method for waste lye in viscose fiber production, comprising the following process steps:

[0027] A. Prepare waste lye and desalinated water with a sodium hydroxide concentration of 70g / L and a semi-fiber content of 60g / L after conventional pretreatment;

[0028] B. The temperature of the pretreated waste lye and desalinated water obtained in control step A is 20°C, and the pretreated waste lye and desalted water are transported to the diffusion dialysis membrane stack for diffusion dialysis. The pretreated spent lye The flow ratio with desalted water is 1:1;

[0029] C. After diffusion dialysis, the lye with low hemicellulose concentration is separated from the lye with high hemicellulose concentration, and the lye with low hemicellulose concentration is reused in production.

Embodiment 2

[0031] A secondary treatment method for waste lye in viscose fiber production, comprising the following process steps:

[0032] A. Prepare waste lye and desalinated water with a sodium hydroxide concentration of 90 g / L and a hemifiber content of 70 g / L after conventional pretreatment;

[0033] B. The temperature of the pretreated waste lye and desalinated water obtained in control step A is 35°C, and the pretreated waste lye and desalted water are transported to the diffusion dialysis membrane stack for diffusion dialysis. The pretreated spent lye The flow ratio with desalted water is 2:1;

[0034] C. After diffusion dialysis, the lye with low hemicellulose concentration is separated from the lye with high hemicellulose concentration, and the lye with low hemicellulose concentration is reused in production.

Embodiment 3

[0036] A secondary treatment method for waste lye in viscose fiber production, comprising the following process steps:

[0037] A. Prepare waste lye and desalinated water with a sodium hydroxide concentration of 80g / L and a hemifiber content of 65g / L after conventional pretreatment;

[0038] B. The temperature of the pretreated waste lye and demineralized water obtained in control step A is 27.5°C, and the pretreated waste lye and demineralized water are transported to the diffusion dialysis membrane stack for diffusion dialysis. The pretreated waste lye The flow ratio to desalted water is 1.5:1;

[0039] C. After diffusion dialysis, the lye with low hemicellulose concentration is separated from the lye with high hemicellulose concentration, and the lye with low hemicellulose concentration is reused in production.

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Abstract

The invention relates to a process for secondary treating of a waste alkali liquid during production of viscose fibers and belongs to the field of viscose fibers. According to the process, the conventionally-pretreated waste alkali liquid with the sodium hydroxide concentration of 70-90g/L and the hemicellulose content of 60-70g/L and demineralized water are transferred into a diffusion dialyzing membrane stack respectively for diffusion dialyzing, the flow ratio of the waste alkali liquid to the demineralized water is (1-2):1, the alkali liquid with the low hemicellulose concentration is separated from the alkali liquid with the high hemicellulose concentration after diffusion dialyzing, and the alkali liquid with the low hemicellulose concentration is used for production. The process solves the problem that the environment is greatly damaged due to direct discharge of the waste alkali liquid which is recycled once and can still produce the secondary waste alkali liquid in the prior art, the process for treating the secondary waste alkali liquid is provided, sodium hydroxide (NaOH) in the waste alkali liquid can be recovered to the maximum extent, the environmental pollution is reduced, the ecological benefit is improved, and simultaneously, the cost for environmental protection treatment is reduced.

Description

technical field [0001] The invention relates to a method for treating waste materials in production, more specifically, the invention relates to a method for secondary treatment of waste lye in viscose fiber production, which belongs to the field of viscose fiber. Background technique [0002] China is the largest producer of textiles and clothing in the world. There is a huge domestic demand market for viscose fiber (viscose fiber is divided into viscose filament and viscose short filament). It stimulates the continuous development and progress of its important raw material, viscose fiber, and makes viscose fiber glow with vigorous vitality. [0003] However, viscose fiber production is the same as other chemical fiber production, and there is a problem of environmental protection. In the production of viscose fiber, the spinning dope is the basic and crucial link. Its basic raw materials are mainly pulp and lye, and in the production process, in order to reduce the consu...

Claims

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Application Information

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IPC IPC(8): B01D61/24
Inventor 易家祥邓传东贺敏唐孝兵莫世清田启兵周林朱小川
Owner YIBIN HIEST FIBER
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