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Method for preparing activated carbon by using papermaking black liquor as active agent

A technology for preparing activated carbon and papermaking black liquor, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., to achieve significant economic and social benefits and pollution control effects

Inactive Publication Date: 2013-11-27
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Using the residual alkali in the papermaking black liquor as an activator to prepare activated carbon can not only extract the lignin in the black liquor as a chemical raw material, but also recycle the residual alkali in the black liquor; it is also necessary to study the mechanism of the black liquor to prepare activated carbon. No literature report

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A kind of method that utilizes papermaking black liquor to prepare activated carbon as active agent, concrete steps are as follows:

[0019] (1) Acid analysis of papermaking black liquor: Under the gauge pressure of 0 MPa and temperature of 30°C, the carbon dioxide emitted by industry is used for acid analysis of papermaking black liquor;

[0020] (2) Causticization of black liquor: lignin and acid analysis black liquor are separated by filtration, and acid analysis black liquor is causticized with quicklime or calcium hydroxide at 70°C;

[0021] (3) Carbonization of sawdust: crush the sawdust and carbonize at 400°C for 0.5 hours;

[0022] (4) Impregnation of sawdust: impregnate carbonized sawdust in step (2) causticizing black liquor at 30°C, with an impregnation ratio of 2;

[0023] (5) After drying the impregnated sawdust, heat it anaerobically in a high-temperature furnace. The activation temperature is 400°C, and the activation time is 0.5 hours. After acid washin...

Embodiment 2

[0025] A kind of method that utilizes papermaking black liquor to prepare activated carbon as active agent, concrete steps are as follows:

[0026] (1) Acid analysis of papermaking black liquor: Under the gauge pressure of 2MPa and temperature of 70°C, acid analysis of papermaking black liquor is carried out by using carbon dioxide emitted by industry;

[0027] (2) Causticization of black liquor: lignin and acid analysis black liquor are separated by filtration, and acid analysis black liquor is causticized with quicklime or calcium hydroxide at 105°C;

[0028] (3) Carbonization of sawdust: crush the sawdust and carbonize at 600°C for 3 hours;

[0029] (4) Impregnation of sawdust: impregnate carbonized sawdust in step (2) causticizing black liquor at 70°C, with an impregnation ratio of 4;

[0030] (5) After drying the impregnated sawdust, heat it anaerobically in a high-temperature furnace. The activation temperature is 900°C, and the activation time is 5 hours. After picklin...

Embodiment 3

[0032] A kind of method that utilizes papermaking black liquor to prepare activated carbon as active agent, concrete steps are as follows:

[0033] (1) Acid analysis of papermaking black liquor: Under the gauge pressure of 1MPa and temperature of 50°C, acid analysis of papermaking black liquor is carried out by using carbon dioxide emitted by industry;

[0034] (2) Causticization of black liquor: lignin and acid analysis black liquor are separated by filtration, and acid analysis black liquor is causticized with quicklime or calcium hydroxide at 90°C;

[0035] (3) Carbonization of sawdust: crush the sawdust and carbonize at 500°C for 1.5 hours;

[0036] (4) Impregnation of sawdust: impregnate carbonized sawdust in step (2) causticizing black liquor at 50°C, with an impregnation ratio of 3;

[0037] (5) After drying the impregnated sawdust, heat it anaerobically in a high-temperature furnace. The activation temperature is 650°C, and the activation time is 2.5 hours. After pick...

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Abstract

The invention discloses a method for preparing activated carbon by using a papermaking black liquor as an active agent. The method comprises the steps of black liquor acidification, caustization, carbonizing of wood chips and activization. According to the method, lignose in the papermaking black liquor is recycled; as the black liquor subjected to acidification and caustization is used as the active agent for preparing the activated carbon, the pollution of the black liquor is efficiently controlled; the method has remarkable economical and social benefits.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method for preparing activated carbon by using papermaking black liquor as an active agent. Background technique [0002] Pulp and paper black liquor is one of the main pollutants in paper mills. According to the analysis of my country's paper industry policy in 2007, by 2010, the effective production capacity of paper and paper will reach 90 million tons, and the analysis of the pollutant emission reduction target of the paper industry during the Eleventh Five-Year Period found that the total amount of paper pollution during this period The removal rate is maintained at about 71%. According to the effective production capacity by 2010, there will be more than 2 billion tons of pollutants to be treated, including a large amount of untreated pulping black liquor. Black liquor treatment technology at this stage mainly includes alkali recovery and biochemical treatment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/12C01B32/324C01B32/342
Inventor 谭非黄彪丁杨陈彦陈孝云吴耿峰卢燕凤
Owner FUJIAN AGRI & FORESTRY UNIV
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