A method for preparing powdered activated carbon from lignin from alkaline papermaking black liquor

A technology for powdered activated carbon and papermaking black liquor, applied in chemical instruments and methods, non-metallic elements, carbon compounds, etc., can solve the problems of reduced micropore volume and surface area, reduced specific surface area of ​​activated carbon, insufficient lignin carbonization, etc. , to achieve the effect of developed pores, strong adsorption, and waste recycling.

Active Publication Date: 2015-11-18
SHANDONG UNIV
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  • Abstract
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Problems solved by technology

However, this method has the following disadvantages: 1), the black liquor is directly used for evaporation and concentration, and the prepared activated carbon product is impure, and there are many impurities in the activated carbon; 2), the impurities occupy the micropores of the activated carbon, and the specific surface area of ​​the activated carbon decreases. The adsorption force is weakened; 3), the alkaline substances in the black liquor are limited, and the carbonization of lignin is not sufficient during the carbonization process, coupled with the high temperature, it is easy to cause the pores to merge, the volume and surface area of ​​the micropores are reduced, and the adsorption force is reduced

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  • A method for preparing powdered activated carbon from lignin from alkaline papermaking black liquor
  • A method for preparing powdered activated carbon from lignin from alkaline papermaking black liquor
  • A method for preparing powdered activated carbon from lignin from alkaline papermaking black liquor

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Embodiment 1

[0034] A method for preparing powdered activated carbon from lignin from alkaline papermaking black liquor, the steps are as follows:

[0035] 1. Use acid analysis to extract lignin from alkaline papermaking black liquor and purify the extracted lignin to remove possible inorganic substances, such as silicon dioxide, to reduce the impact on the subsequent carbonization or activation process. The extraction and purification steps are as follows: pass carbon dioxide gas into the alkaline papermaking black liquor, then add 1mol / L sulfuric acid for pickling, the lignin is precipitated under acidic conditions, filter, separate the precipitate from the black liquor, and dry the precipitate Dry, extract crude lignin; the extracted crude lignin is dissolved in water, the ratio of crude lignin to water is 1:3, add 1mol / L hydrochloric acid solution, the addition amount is 10ml / g lignin, adjust the pH to 2 , soaked for 24 hours, suction filtered, washed with deionized water until the pH ...

Embodiment 2

[0043] A method for preparing powdered activated carbon from lignin from alkaline papermaking black liquor, the steps are as follows:

[0044] 1, lignin extraction, with embodiment 1.

[0045] 2. Carbonization of lignin

[0046] The lignin was pulverized and passed through a 40-mesh sieve; the lignin under the sieve was put into a porcelain crucible, then placed in a resistance furnace, heated to 300°C, and carbonized for 100 minutes.

[0047] 3. Activation

[0048] Take the carbonized lignin and add it to the crucible, then add KOH with a mass fraction of 85%, and stir while adding. The mass ratio of lignin to KOH is 1:4. Place the crucible in an ultrasonic water bath for 35 minutes, 105°C Dry the mixture of lignin and potassium hydroxide in a tube heating furnace for heating and activation for 1 hour. The temperature in the tube heating furnace is 700 ° C. Stop heating and cool to room temperature under nitrogen atmosphere. The final product is taken out; washed with dilu...

Embodiment 3

[0050] A method for preparing powdered activated carbon from lignin from alkaline papermaking black liquor, the specific steps are as follows:

[0051] 1, lignin extraction, with embodiment 1.

[0052] 2. Carbonization of lignin

[0053] Take the lignin and pulverize it, pass through a 40-mesh sieve, put the lignin under the sieve into a porcelain crucible, then place it in a resistance furnace, heat up to 400°C, and carry out carbonization treatment for 80 minutes.

[0054] 3. Activation of lignin, add charred lignin into the crucible, then add KOH with a mass fraction of 85%, stir while adding, the mass ratio of lignin to KOH is 1:2, put the crucible in ultrasonic Ultrasound in a water bath for 35 minutes, and dry at 105°C; place the dried lignin and potassium hydroxide mixture in a tube heating furnace for heating and activation for 2 hours, and the temperature in the tube heating furnace is 650°C, stop heating , cooled to room temperature under a nitrogen atmosphere, and...

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Abstract

The invention provides a method for preparing activated carbon powder with lignin from an alkaline papermaking black liquor. The method comprises the steps as follows: the lignin is extracted from the alkaline papermaking black liquor through acidification and is prepared after being purified; KOH (potassium hydroxide) is added after the lignin is carbonized; the mixture is placed in an ultrasonic water bath to be subjected to ultrasonic treatment for 30 to 35 min; and after being dried, the mixture of the lignin and the potassium hydroxide is heated and activated for 0.5 to 2.0 hours at 650 to 850 DEG C, so as to prepare the activated carbon powder. The method has the advantages that the process is simple; waste utilization is realized; and the prepared activated carbon powder has the effects of large specific surface area, high porosity, strong adsorption effect and excellent properties and can effectively remove heavy metals and organic pollutants.

Description

technical field [0001] The invention relates to a method for preparing activated carbon, in particular to a method for preparing powdered activated carbon by using lignin extracted from alkaline papermaking black liquor, and belongs to the technical field of activated carbon preparation. Background technique [0002] Powdered activated carbon is dark black in appearance, has good adsorption performance, good chemical stability, can withstand strong acid and alkali, can withstand water immersion and high temperature, and is a porous hydrophobic adsorbent. It is widely used in decolorization and deodorization in water. It has strong adsorption capacity for organic compounds dissolved in water such as benzene, phenols and other compounds; it also has strong adsorption capacity for heavy metals such as mercury, aluminum, iron, nickel, zinc and cobalt. . Compared with granular activated carbon, its equipment investment is low, its price is cheaper, its adsorption speed is fast, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/12C01B32/324C01B32/348
Inventor 岳钦艳高原高宝玉孙媛媛李倩王文语
Owner SHANDONG UNIV
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