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Method for producing sodium lignosulfonate by using pulping black liquor of sulphate method

A technology of sodium lignosulfonate and black liquor for pulping is applied in the fields of pulping and papermaking, environmental protection and comprehensive utilization of resources, and can solve the problems of waste of lignin resources, pollution of white mud and green liquor, consumption of lime, etc.

Pending Publication Date: 2019-01-22
HENAN ACADEMY OF SCI CHEM RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The alkali recovery process consumes a large amount of lime and generates a large amount of lime mud. The disposal of the lime mud and the pollution of green liquor have become major issues under the current environmental protection situation.
However, alkali recovery burns valuable lignin resources in black liquor as fuel at a low value, resulting in a serious waste of lignin resources

Method used

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  • Method for producing sodium lignosulfonate by using pulping black liquor of sulphate method
  • Method for producing sodium lignosulfonate by using pulping black liquor of sulphate method

Examples

Experimental program
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Effect test

Embodiment 1

[0014] Kraft pulping black liquor with a solid content of 10%: .Add 20kg of cationic polyacrylamide aqueous solution with a mass fraction of 0.1% per 1000kg of pulping black liquor, mix and react, and centrifuge to remove water-insoluble matter; .At a temperature of 75°C, use a ceramic ultrafiltration membrane with a filter aperture of 10 nm to filter and concentrate the pulping black liquor to a solid content of 20%, and the filtrate is reused for cooking and pulping; (3). Sodium persulfate is added in the liquid, and in every 1000kg concentrated black liquor, the sodium persulfate addition is 15kg, enters multi-effect evaporator to evaporate and concentrate, react. After being evaporated by 1-2 effect evaporator, 40kg of sodium sulfite was added, concentrated by evaporation and modified by sulfonation simultaneously. Evaporation and concentration by 3-4 effect evaporators until the solid content of the black liquor is 50%; (4), spray drying to obtain sodium lignosulfonate...

Embodiment 2

[0016] Kraft pulping black liquor with a solid content of 15%: .Add 30kg of anionic polyacrylamide aqueous solution with a mass fraction of 0.2% to every 1000kg of pulping black liquor, mix and react, and centrifuge to remove water-insoluble matter; .At a temperature of 85°C, use a ceramic ultrafiltration membrane with a filter aperture of 10 nm to filter and concentrate the pulping black liquor to a solid content of 30%, and the filtrate is reused for cooking and pulping; (3). Sodium persulfate is added in the liquid, and per 1000kg of concentrated black liquor, the amount of sodium persulfate added is 30kg, and enters the multi-effect evaporator for evaporation, concentration and reaction. After being evaporated by 1-2 effect evaporator, 65kg of sodium bisulfite was added, concentrated by evaporation and modified by sulfonation synchronously, and then evaporated and concentrated by 3-4 effect evaporator until the solid content of black liquor was 55%; (4), spray drying Th...

Embodiment 3

[0018] Kraft pulping black liquor with a solid content of 20%: .Add 40kg of cationic polyacrylamide aqueous solution with a mass fraction of 0.2% to every 1000kg of pulping black liquor, mix and react, and centrifuge to remove water-insoluble matter; .At a temperature of 90°C, use a ceramic ultrafiltration membrane with a filter aperture of 20nm to filter and concentrate the pulping black liquor to a solid content of 40%, and the filtrate is reused for cooking and pulping; (3). Sodium persulfate is added to the liquid, and the amount of sodium persulfate added is 40k per 1000kg of concentrated black liquor. Enter the multi-effect evaporator to evaporate, concentrate and react. After being evaporated by the 1-2 effect evaporator, 95kg of sodium sulfite was added, evaporated and concentrated and simultaneously modified by sulfonation, and then evaporated and concentrated by the 3-4 effect evaporator until the solid content of the black liquor was 60%. (4), spray drying to ob...

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Abstract

The invention discloses a method for producing sodium lignosulfonate by using pulping black liquor of a sulphate method, which belongs to the fields of pulping and papermaking, environmental protection and comprehensive utilization of resources. The process adopts the pulping black liquor of a sulphate method as a main raw material, and produces sodium lignosulfonate by filtration, evaporation concentration, sulfonation modification, spray drying, etc. The black liquor is turned into wealth from wastes, and resources are made full use of, to produce high value-added fine chemical products, andreduce waste of resources. The sodium lignosulfonate product produced by the method is used for a concrete water reducing agent, and various performance indexes meet the standard requirements of a concrete high-efficiency water reducing agent.

Description

technical field [0001] The invention belongs to the fields of pulping and papermaking, environmental protection and resource comprehensive utilization. The invention relates to resource comprehensive utilization of pulping and papermaking black liquor by kraft method, in particular to a method for producing sodium lignosulfonate by using kraft pulping black liquor. Background technique [0002] Kraft pulping is currently the most widely used pulping method, and the cooking agents used are NaOH and NaOH 2 S, also contains a small amount of Na 2 SO 4 , the pH value of the cooking system is 13-14, and the active ingredient of the liquid is OH - and HS - . Kraft pulping was invented in Germany in 1884, and the United States first realized the industrialization of alkali recovery of its cooking waste liquor in 1928-1934, which led to the rapid development of Kraft pulping. Over the past 100 years, the kraft pulping process has not changed much, but its operating unit, equip...

Claims

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Application Information

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IPC IPC(8): C08H7/00
CPCC08H6/00
Inventor 王俊崔俊峰赵亮田振邦段文杰赵可江黄做华黄伟庆李宾宾寇丽栋王静
Owner HENAN ACADEMY OF SCI CHEM RES INST CO LTD
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