A method for preparing activated carbon by using papermaking black liquor lignin

A technology for preparing activated carbon and papermaking black liquor, applied in chemical instruments and methods, non-metallic elements, carbon compounds, etc., can solve the problems of waste disposal, papermaking black liquor lignin pollution, etc., and achieve simple operation, short reaction time and abundant raw materials Effect

Active Publication Date: 2018-06-26
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a kind of activated carbon preparation technology to solve the pollution and disposal problems of papermaking black liquor lignin

Method used

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  • A method for preparing activated carbon by using papermaking black liquor lignin
  • A method for preparing activated carbon by using papermaking black liquor lignin

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Experimental program
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Effect test

Embodiment 1

[0025] Step 1) The lignin extracted from the papermaking black liquor is dried in the sun. Select potassium hydroxide as the activator, and put it into the ball milling tank at the ratio of lignin to activator mass ratio of 1:1.5;

[0026] Step 2) Set the speed range of the ball mill to 500r / min, and obtain a mixture of the two after 6 hours of grinding;

[0027] Step 3) Put the mixture into a high-temperature furnace, inject argon gas into the high-temperature furnace, first evacuate for 5 minutes, then heat up to a carbonization temperature of 450°C at a rate of 3°C / min, and maintain carbonization for 2 hours.

[0028] Step 4) Subsequently, the carbonization temperature is increased at a heating rate of 5°C to an activation temperature of 800°C, and the activation time is 1.5h.

[0029] Step 5) After cooling, the obtained activated carbon is first immersed and cleaned with water, then diluted with hydrochloric acid to adjust the pH to neutral, and finally cleaned with water again, a...

Embodiment 2

[0035] Step 1) The lignin extracted from the papermaking black liquor is dried in the sun. Select potassium carbonate as the activator and put it into the ball milling tank according to the mass ratio of lignin to activator 2:1;

[0036] Step 2) Set the speed range of the ball mill to 100r / min, and obtain a mixture of the two after grinding for 8 hours;

[0037] Step 3) Put the mixture into a high-temperature furnace, and pass argon into the high-temperature furnace, first evacuate for 10 minutes, then heat up to a carbonization temperature of 550°C at a rate of 20°C / min, and maintain carbonization for 1 hour.

[0038] Step 4) Subsequently, the carbonization temperature is increased to an activation temperature of 900°C at a heating rate of 20°C / min, and the activation time is 2.5h.

[0039] Step 5) After cooling, the obtained activated carbon is first immersed and cleaned with water, then diluted with nitric acid to adjust the pH to neutral, and finally cleaned with water again, and ...

Embodiment 3

[0042] Step 1) The lignin extracted from the papermaking black liquor is dried in the sun. Select potassium hydroxide and potassium carbonate as activators, the mass ratio of the two is 1:1, and put them into the ball mill tank according to the mass ratio of lignin to activator of 1:3;

[0043] Step 2) Set the speed range of the ball mill to 300r / min, and obtain a mixture of the two after grinding for 3 hours;

[0044] Step 3) Put the mixture into a high-temperature furnace, and pass nitrogen into the high-temperature furnace, first evacuate for 5 minutes, then heat up to a carbonization temperature of 400°C at a rate of 10°C / min, and maintain carbonization for 3.5 hours.

[0045] Step 4) Subsequently, the carbonization temperature is increased to an activation temperature of 1000° C. at a heating rate of 10° C. / min, and the activation time is 1 h.

[0046] Step 5) After cooling, the obtained activated carbon is first immersed and cleaned with water, then diluted with sulfuric acid to...

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Abstract

The invention provides a method for preparing active carbon by using lignin in papermaking black liquid and relates to a preparation method for the active carbon. According to the invention, the lignin is adopted as a carbon source; an alkaline activating agent is used; the lignin and the activating agent are mixed by ball milling; the process of high-temperature preparation is divided into two stages of carbonization and activation; thus, short high-temperature reaction time and simple operation process are achieved. Specifically, through ball-milling mixing of the activating agent and the lignin, complicated and cumbersome operation of an impregnation method is eliminated; meanwhile, activation effect is improved; and the active carbon with a rich pore structure and a specific surface area larger than 3000 m2 / g can be prepared.

Description

Technical field [0001] The invention relates to a preparation method of activated carbon, in particular to a method for preparing activated carbon by using lignin in papermaking black liquor as a raw material. Background technique [0002] The source of the problem: The paper industry generally uses alkaline pulping, and the black liquor produced by the pulping industry contains a lot of organic pollutants and toxic substances. Therefore, the black liquor cannot be directly discharged into the water to avoid pollution. At the same time, the black liquor contains a large amount of lignin. If the lignin is extracted to prepare activated carbon, the purpose of recycling can be achieved. However, after extracting lignin from black liquor, some paper companies often landfill, burn or sell them as low-cost fuels due to lack of market and technical support. [0003] Lignin is the second most abundant organic matter in nature, with abundant raw materials and low price. It is the most abu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/348C01B32/324
CPCC01P2006/12C01P2006/14C01P2006/16C01P2006/17
Inventor 向中华谢呈鹏欧阳亦轩
Owner BEIJING UNIV OF CHEM TECH
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