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Ultrafiltration Pretreatment Process for Black Liquor Electrodialysis Alkali Recovery in Pulp Manufacturing

An electrodialysis and pretreatment technology, which is applied in the regeneration of lye, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of not fully considering the specificity of chemical components and low recovery rate of alkali , to achieve good flocculation effect, high alkalinity and stable operation

Inactive Publication Date: 2015-08-19
YIBIN HIEST FIBER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent also does not fully consider the particularity of the chemical components in the viscose fiber waste lye, and the alkali recovery rate of the conventional pretreated lye for further membrane separation is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Ultrafiltration pretreatment process for black liquor electrodialysis alkali recovery in pulp manufacturing: Cooking black liquor with a sodium hydroxide concentration of 8g / L first removes large particles by flocculation, and then recovers lignin and interception by ultrafiltration Large molecular weight pollutants, the obtained permeate containing NaOH is used for subsequent electrodialysis treatment.

Embodiment 2

[0035] Ultrafiltration pretreatment process for black liquor electrodialysis alkali recovery in pulp manufacturing: Cooking black liquor with a sodium hydroxide concentration of 30g / L first removes large particles by flocculation, and then recovers lignin and interception by ultrafiltration Large molecular weight pollutants, the obtained permeate containing NaOH is used for subsequent electrodialysis treatment.

[0036] The sodium hydroxide concentration in the pretreated black liquor is 25g / L, and the hemifiber content is 7.9g / L.

Embodiment 3

[0038] The ultrafiltration pretreatment process of black liquor electrodialysis alkali recovery in pulp manufacturing is characterized in that: the cooking black liquor with a sodium hydroxide concentration of 20g / L first removes large particles by flocculation, and then recovers by ultrafiltration Lignin and large molecular weight pollutants are retained, and the obtained NaOH-containing permeate is used for subsequent electrodialysis treatment.

[0039] The sodium hydroxide concentration in the pretreated black liquor is 19g / L, and the hemifiber content is 8.5g / L.

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Abstract

The invention provides a pre-treatment technology of ultrafiltration for electrodialytic alkali recovery of black liquor in pulp manufacturing, which is characterized in that digestion black liquor with sodium hydroxide of the concentration of 8-30 g / L is subjected to a flocculation method for removing large-grained materials firstly, and then ultrafiltration for recycling lignose and stopping high molecular weight pollutants, so as to obtain permeate liquor with NaOH used for subsequent electrodialytic treatment. According to the properties of high chromaticness, high basicity, high saltness, and high COD load of hemicellulose produced by viscose in the digesting process, the black liquor is subjected to pre-treatment firstly, so as to allow indexes of the pre-treated black liquor to be suitable for the subsequent electrodialytic alkali recovery technology, and therefore, the purposes of high alkali recovery, low energy consumption and stable operation can be achieved.

Description

technical field [0001] The invention belongs to the technical field of waste recovery in pulp production, and in particular relates to an ultrafiltration pretreatment process suitable for black liquor electrodialysis alkali recovery in pulp 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04D21C11/04
CPCY02P70/10
Inventor 易家祥邓传东朱小川田启兵王占龙
Owner YIBIN HIEST FIBER
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