Method for preparing activated carbon powder with 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: 2012-10-03
SHANDONG UNIV
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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 de

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  • Method for preparing activated carbon powder with lignin from alkaline papermaking black liquor
  • Method for preparing activated carbon powder with lignin from alkaline papermaking black liquor
  • Method for preparing activated carbon powder with lignin from alkaline papermaking black liquor

Examples

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Example Embodiment

[0033] Embodiment 1,

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

[0035] 1. Extract lignin from alkaline papermaking black liquor by acid precipitation and purify the extracted lignin to remove possible inorganic substances such as silica, so as to reduce the impact on the subsequent carbonization or activation process. The extraction and purification steps are as follows: carbon dioxide gas is introduced into the alkaline papermaking black liquor, then 1 mol / L sulfuric acid is added for pickling, the lignin is precipitated under acidic conditions, filtered, the precipitate is separated from the black liquor, and the precipitate is dried. 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...

Example Embodiment

[0042] Embodiment 2,

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

[0044] 1. Extraction of lignin, same as Example 1.

[0045] 2. Lignin carbonization

[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 min.

[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. Dry down; the mixture of lignin and potassium hydroxide after drying is placed in a tubular heating furnace for heating and activation for 1h, and the temperature in the tubular heating furnace is 700 ° C, and the heating is stopped, and the nitrogen atmosphere is cooled to room temperature, and the The final product is taken out; washed to pH 7 with dilute hydrochloric ...

Example Embodiment

[0049] Embodiment 3,

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

[0051] 1. Extraction of lignin, same as Example 1.

[0052] 2. Lignin carbonization

[0053] Get lignin and pulverize, cross 40 mesh sieves, and the lignin under the sieve is put into the porcelain crucible, then placed in the resistance furnace, warming up to 400 DEG C, and carrying out carbonization treatment 80min.

[0054] 3. Activation of lignin, take the carbonized lignin and add it to the crucible, then add KOH with a mass fraction of 85%, stir while adding, the mass ratio of lignin and KOH is 1:2, put the crucible in the ultrasonic Ultrasonic 35min in the water bath, oven dry at 105 DEG C; The mixture of lignin after oven drying and potassium hydroxide is placed in the tubular heating furnace for heating and activation 2h, and the temperature in the tubular heating furnace is 650 DEG C, and the hea...

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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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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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