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A resource disposal method of kraft wood pulp black liquor

A technology of sulfate method and disposal method, applied in chemical instruments and methods, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve problems such as waste of lignin resources, save concentration costs, and improve sulfonation rate Effect

Active Publication Date: 2021-06-25
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

However, alkali recovery burns valuable lignin resources in black liquor as fuel at a low value, resulting in a serious waste of lignin resources, and the calorific value generated by black liquor combustion is far lower than the calorific value required for its evaporation and concentration

Method used

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  • A resource disposal method of kraft wood pulp black liquor
  • A resource disposal method of kraft wood pulp black liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The kraft pulping black liquor with a solid content of 10%: (1), add 20kg of cationic polyacrylamide aqueous solution with a mass fraction of 0.1% in every 1000kg of pulping black liquor, mix and react, and centrifuge to remove water-insoluble matter; (2 ), 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 collected for use. (3) Adjust the pH value of the concentrated black liquor to 3 with sulfuric acid, and centrifuge to obtain acid-analyzed lignin. The acid analysis waste liquid is treated with an alkali recovery process to recover sodium sulfide, and is reused for cooking and pulping; (4), acid analysis lignin is washed and purified, mixed with the filtrate of step (2), and reacted at 90 ° C for 1 h; ( 5), adding sodium persulfate, evaporating and concentrating in a multi-effect evaporator, adding sodium sulfite after evapo...

Embodiment 2

[0016] The kraft pulping black liquor with a solid content of 15%: (1), add 30 kg of anionic polyacrylamide aqueous solution with a mass fraction of 0.2% in every 1000 kg of pulping black liquor, mix and react, and centrifuge to remove water-insoluble matter; (2 ), 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 collected for use. (3) Adjust the pH value of the concentrated black liquor to 4 with sulfuric acid, and centrifuge to obtain acid-analyzed lignin. The acid analysis waste liquid is treated with an alkali recovery process to recover sodium sulfide, and is reused for cooking and pulping; (4), acid analysis lignin is washed and purified, mixed with the filtrate of step (2), and reacted at 95 ° C for 1 h; ( 5), adding sodium persulfate, evaporating and concentrating in a multi-effect evaporator, adding sodium sulfite after evap...

Embodiment 3

[0018] The kraft pulping black liquor with a solid content of 20%: (1), add 40 kg of cationic polyacrylamide aqueous solution with a mass fraction of 0.2% in every 1000 kg of pulping black liquor, mix and react, and centrifuge to remove water-insoluble matter; (2 ), at a temperature of 90°C, use a ceramic ultrafiltration membrane with a filter pore size of 20 nm to filter and concentrate the pulping black liquor to a solid content of 30%, and the filtrate is collected for use. (3) Adjust the pH value of the concentrated black liquor to 5 with sulfuric acid, and centrifuge to obtain acid-analyzed lignin. The acid analysis waste liquid is treated with an alkali recovery process to recover sodium sulfide, and is reused for cooking and pulping; (4), acid analysis lignin is washed and purified, mixed with the filtrate of step (2), and reacted at 98 ° C for 1 h; ( 5), adding sodium persulfate, evaporating and concentrating in a multi-effect evaporator, adding sodium sulfite after ev...

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Abstract

The invention discloses a resource disposal method for kraft wood pulp black liquor, which belongs to the fields of pulp and paper making, environmental protection and resource comprehensive utilization. In this process, the cooking black liquor from kraft wood pulp papermaking is centrifuged to remove water-insoluble matter, and then filtered with a ceramic ultrafiltration membrane, and the filtrate is reused; Purification, washing and purification, vulcanization reaction, evaporation concentration and simultaneous sulfonation modification, spray drying to produce sodium lignosulfonate. The acid analysis waste liquid is treated with alkali recovery process to recover sodium sulfide and reuse it for cooking and pulping. The present invention recycles the black liquor of kraft process wood pulp, and the produced sodium lignosulfonate product has high purity and good quality, and when used in concrete water reducer, each performance index meets the standard requirements of concrete high-efficiency water reducer .

Description

technical field [0001] The invention belongs to the fields of pulping and papermaking, environmental protection and resource comprehensive utilization. The invention relates to the resourceful comprehensive utilization of kraft pulping and papermaking black liquor, and specifically relates to a resource disposal method of kraft wood pulp 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 - . At present, the world's kraft pulping pulp production accounts for about 70% of the total pulp production, occupying a major position in pulp manufacturing. The process has the following advantages: strong adaptability to fiber raw materials, applicable to all pulp fiber raw materials; good paper strength, which is inferior to that of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C04B24/18C02F103/28C04B103/30
CPCC02F1/04C02F1/444C02F1/56C02F1/66C02F9/00C02F2103/28C04B24/18C04B2103/302
Inventor 王俊崔俊峰黄做华黄伟庆李宾宾寇丽栋田振邦段文杰赵可江赵亮王静
Owner HENAN ACADEMY OF SCI CHEM RES INST CO LTD
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