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Resource treatment method of wood pulp black liquor obtained by sulfate method

A technology of sulfate method and disposal method, applied in chemical instruments and methods, water/sewage treatment, processing wastewater treatment, etc., can solve problems such as lignin resource waste

Active Publication Date: 2019-01-11
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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  • Resource treatment method of wood pulp black liquor obtained by sulfate method
  • Resource treatment method of wood pulp black liquor obtained by sulfate method

Examples

Experimental program
Comparison scheme
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 pore size of 10 nm to filter and concentrate the pulping black liquor to a solid content of 20%, and collect the filtrate 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 hour; . Add sodium persulfate, evaporate and concentrate in a multi-effect evaporator, add sodium sulfite after the first effect of evaporation, a...

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 pore size of 10 nm to filter and concentrate the pulping black liquor to a solid content of 30%, and collect the filtrate 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 hour; . Add sodium persulfate, evaporate and concentrate in a multi-effect evaporator, add sodium sulfite after the first effect of evaporatio...

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 pore size of 20 nm to filter and concentrate the pulping black liquor to a solid content of 30%, and collect the filtrate 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 hour; . Add sodium persulfate, evaporate and concentrate in a multi-effect evaporator, add sodium sulfite after the first effect of evaporati...

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Abstract

The invention discloses a resource treatment method of a wood pulp black liquor obtained by a sulfate method and belongs to the fields of pulping and papermaking, environmental protection and comprehensive utilization of resources. The resource treatment method comprises: carrying out centrifugation on a digestion black liquor obtained by the sulfate method wood pulp papermaking to separate waterinsoluble matters, filtering the digestion black liquor through a ceramic ultrafiltration membrane, recycling the filtrate, adjusting pH of the concentrated black liquor to precipitate lignin at pH less than 7 and carrying out separation purification on the lignin, washing purification, sulfurization reaction, evaporation concentration, simultaneous sulfonation modification, and spray drying to obtain sodium lignosulfonate. Sodium sulfide in the acid precipitation waste liquid is recovered and treated through an alkali recovery process and is used for digestion pulping. The sodium lignosulfonate product obtained by the method has high purity and good quality, can be used as a concrete water reducing agent and has performance indexes meeting the standard requirements of the 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 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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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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