A pretreatment process for black liquor electrodialysis alkali recovery in pulp production

A technology of pretreatment and electrodialysis, applied in sustainable manufacturing/processing, regeneration of lye, paper machine, etc., can solve the problems of low alkali recovery rate, insufficient consideration of the particularity of chemical components, etc., and achieve good flocculation effect, The effect of reducing energy consumption and reducing viscosity

Inactive Publication Date: 2015-11-04
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

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Effect test

Embodiment 1

[0038] A pretreatment process for black liquor electrodialysis alkali recovery in pulp manufacturing: the cooking black liquor with a concentration of sodium hydroxide of 8g / L first recovers lignin by flocculation, and the supernatant is intercepted by a plate and frame filter. Molecular weight pollutants are then pumped into the membrane module and transported to the diffusion dialysis membrane stack to obtain dilute lye for subsequent electrodialysis treatment.

Embodiment 2

[0040]A pretreatment process for black liquor electrodialysis alkali recovery in pulp manufacturing: the cooking black liquor with a concentration of sodium hydroxide of 30g / L first recovers lignin by flocculation, and the supernatant is intercepted by a plate and frame filter. Molecular weight pollutants are then pumped into the membrane module and transported to the diffusion dialysis membrane stack to obtain dilute lye for subsequent electrodialysis treatment.

[0041] The sodium hydroxide concentration in the pretreated black liquor is 25g / L, and the hemifiber content is 7.5g / L.

Embodiment 3

[0043] A pretreatment process for black liquor electrodialysis alkali recovery in pulp manufacturing: the cooking black liquor with a concentration of sodium hydroxide of 25g / L first recovers lignin by flocculation, and the supernatant is intercepted by a plate-and-frame filter. Molecular weight pollutants are then pumped into the membrane module and transported to the diffusion dialysis membrane stack to obtain dilute lye for subsequent electrodialysis treatment.

[0044] The sodium hydroxide concentration in the pretreated black liquor is 10g / L, and the hemifiber content is 6.2g / L.

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Abstract

The invention discloses a pre-treatment process for recycling lack liquor electrodialysis alkaline in pulp preparation. The pre-treatment process is characterized by comprising the following steps of: recycling lignin from digested black liquor with sodium hydroxide concentration of 8g / L-30g / L through a flocculation method; taking supernatant liquor to block pollutants with large molecular weight by a plate frame filter; and entering the pollutants into a membrane assembly by a pump for conveying to a diffusion dialysis membrane stack to obtain diluted alkali liquor for subsequent electroosmosis treatment. The pre-treatment process can be used for pre-treating the black liquor according to the characteristics including high chromaticity, high basicity, high salt content and high COD (Chemical Oxygen Demand) load of hemicellulose which is generated in a digesting process of viscose, so that the indexes of the pre-treated black liquor are suitable for the subsequent electroosmosis recycling process, and therefore, the purposes of high alkaline recovery rate, 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 a pretreatment process applicable to 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 fibers (filament...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C11/04
CPCY02P70/24Y02P70/10
Inventor 易家祥邓传东朱小川田启兵王占龙
Owner YIBIN HIEST FIBER
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