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Method for recovering alkali and hemicellulose from chemical fibre waste liquid

A technology of hemicellulose and waste liquid, which is applied in the field of membrane separation, can solve the problems of low efficiency of recovery of alkali squeeze liquid, large site area, pollution of the environment, etc., and achieve the effect of short investment recovery period, high economic benefit and simple process

Inactive Publication Date: 2003-10-22
凯能高科技工程(上海)有限公司
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for recovering alkali and hemicellulose in chemical fiber waste liquid, so as to overcome the defects of low efficiency of recovering alkali squeeze liquid by dialysis, polluting the environment, and occupying a large site area

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] will be 100m 3 Squeeze liquid with NaOH concentration of 223.2g / L and hemicellulose concentration of 25.17g / L at a temperature of 45°C and a pressure of 20kg / cm 2 Under certain conditions, after passing through the tubular membrane nanofiltration system with a molecular weight cut-off of 600, when the permeate volume reaches 85m 3 When, start to add through washing water 30m 3 , the final concentrated volume is 10m 3 . See Table 1 for the processing results.

Embodiment 2

[0021] will be 150m 3 The squeeze liquid with a NaOH concentration of 223.2g / L and a hemicellulose concentration of 25.17g / L, at a temperature of 25°C and a pressure of 15kg / cm 2 Under certain conditions, after passing through a plate ultrafiltration membrane system with a molecular weight cut-off of 50,000, when the permeate volume reaches 130m 3 When, start to add through washing water 50m 3 , the final concentrated volume is 15m 3 . See Table 1 for the processing results. Comparative example 1

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Abstract

The method for recovering alkali and hemicellulose from waste liquor produced by producing optical fibre includes the folloiwng steps: making the pressed liquor containing alkali and hemicellulose undergo the processes of prefiltration and fine filtration, and feeding it into membrane separation equipment to obtain the penetrated liquor containing alkali and concentrate containing hemicellulose, and the alkaline liquor concentration in the obtained penetrated liquor can be up to 80-250 g / l, and the final alkali content in the concentrate is 5-30 g / l, and the hemicellulose content is 100-200 g / l. Said technological process is simple, can effectively separate and purify hemicellulose and alkali liquor.

Description

technical field [0001] The invention relates to a treatment method for chemical fiber waste liquid, in particular to membrane separation technology. technical background [0002] In the production process of viscose fiber (rayon) using chemical fiber pulp (wood pulp or cotton pulp) as raw material, since the raw material contains more hemicellulose, the raw material is usually impregnated and pressed with alkaline solution, and the Hemicellulose is dissolved in alkaline solution, otherwise it will have extremely adverse effects on viscose fiber production process and finished product quality. In order to reduce production costs, reduce alkali consumption, and protect the environment, it is necessary to recycle hemicellulose and alkali. The traditional method is to achieve it through dialysis. Due to the low efficiency of the traditional dialysis method for recovering squeeze liquid, polluting the environment, and occupying a large building area, it is necessary to research ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44D01F13/02
CPCY02P70/62
Inventor 葛文越林爱莲
Owner 凯能高科技工程(上海)有限公司
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