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Novel alkali recovery technology during viscose fiber production

A viscose fiber and new process technology, applied in alkali metal compounds, alkali metal oxides/hydroxides, inorganic chemistry, etc., to achieve stable operation, low energy consumption, and no power consumption

Active Publication Date: 2015-04-22
YIBIN HIEST FIBER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem of waste alkali recovery in viscose fiber production, the present invention proposes a new alkali recovery process in viscose fiber production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A new alkali recovery process in the production of viscose fiber, the pretreated waste alkali and desalted water are transported to the membrane module through the pump at a flow ratio of 1:1 to the diffusion dialysis membrane unit, and the waste alkali that flows out Through the anode chamber of electrodialysis, the dilute lye passes through the cathode chamber as electrolyte, reclaims the concentrated alkali that the cathode chamber obtains, the described spent lye sodium hydroxide concentration after pretreatment is 50g / L, and semi-fiber content is 50g / L.

Embodiment 2

[0038] A new alkali recovery process in the production of viscose fiber. The pretreated waste alkali and desalted water are transported to the membrane module through the pump at a flow ratio of 2:1 to the diffusion dialysis membrane unit, and the waste alkali that flows out Through the anode chamber of electrodialysis, the dilute lye passes through the cathode chamber as electrolyte, and reclaims the concentrated alkali obtained in the cathode chamber. The sodium hydroxide concentration of the pretreated waste lye is 200g / L, and the semi-fiber content is 150g / L.

[0039] The spent lye and demineralized water enter the diffusion dialysis membrane unit in a cross-flow manner.

[0040] The process operates at a temperature of 45°C.

[0041] The gauge pressure of the pump is 0.08Mpa.

Embodiment 3

[0043] A new alkali recovery process in the production of viscose fiber. The pretreated waste alkali and desalted water are transported to the membrane module through the pump at a flow ratio of 1.5:1 to the diffusion dialysis membrane unit, and the waste alkali that flows out Through the anode chamber of electrodialysis, the dilute lye passes through the cathode chamber as electrolyte, and the concentrated alkali obtained in the cathode chamber is reclaimed. The pretreated waste lye sodium hydroxide concentration is 80g / L, and the semi-fiber content is 20g / L.

[0044] The spent lye and demineralized water enter the diffusion dialysis membrane unit in a cross-flow manner.

[0045] The temperature of the electrodialysis is 15°C.

[0046] The gauge pressure of the pump is 0.03Mpa.

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Abstract

The invention provides a novel alkali recovery technology during viscose fiber production, which is characterized by comprising the steps that pretreated waste alkali liquor and de-mineralized water at a flow ratio of (1-2):1 enter a membrane module by a pump, and are conveyed to a diffusion dialysis membrane module device; the outflowed waste alkali liquor passes through an anode chamber of electrodialysis; dilute alkali liquor serves as an electrolyte and passes through a cathode chamber; and densified alkali obtained by the cathode chamber is recovered, wherein a concentration of sodium hydroxide of the pretreated waste alkali liquor is 50-200g / L, and the content of hemicellulose is 20-150g / L. According to the characteristic that high-concentration waste alkali containing the hemicellulose is generated during a viscose fiber production course, by using a diffusion dialysis and electrodialysis combined method, an optimized technological parameter is selected, so that the novel alkali recovery technology has the advantages of high alkali recovery rate, low energy consumption and stability in operation.

Description

technical field [0001] The invention relates to an alkali recovery process, in particular to a new alkali recovery process suitable for viscose fiber production, and belongs to the technical field of waste recovery in viscose fiber production. Background technique [0002] Viscose fiber is a chemical fiber processed by chemical and mechanical methods using polymer materials such as wood pulp and cotton pulp containing natural cellulose. Viscose fiber is the kind of chemical fiber that is closest to the performance of natural fiber clothing. It has the characteristics of soft hand feeling, moisture absorption and breathability, elegant hanging, bright dyeing, antistatic and easy textile processing. It is a regenerated fiber derived from nature and superior to nature. Vegan fiber is one of the important raw materials for the textile industry. At present, there are about 40 viscose fiber enterprises in my country. In addition to the production of ordinary viscose fibers (filam...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/58C01D1/38C08B37/14
Inventor 冯涛邓传东易家祥朱小川田启兵
Owner YIBIN HIEST FIBER
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