Method for preparing spherical activated carbons with narrow mesoporous size distribution

A pore size distribution, activated carbon technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of time-consuming, difficult to remove Zn ions, and achieve fewer process steps, which is conducive to industrialization and promotion. The effect of narrow pore size distribution

Inactive Publication Date: 2013-01-09
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above method can prepare spherical activated carbon rich in mesopores, the process of removing Zn ions is difficult and time-consuming, and repeated washing is required to remove Zn ions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Prepare 1000ml of an aqueous solution containing 5wt% polyvinyl alcohol and place it in a three-necked flask. Put 20g of phenol, 13g of formaldehyde, 0.85g of sodium hydroxide and 2.57g of ionic liquid 1-carboxyethyl-3-methylimidazolium tetrafluoroborate in a molar ratio of 1:2:0.1:0.05 into 1000ml of the above dispersion In, stir for 10min. Then the temperature was raised to 70°C at a rate of 0.5°C / min under stirring, and the reaction was carried out at this temperature for 1 h. That is, phenolic resin balls are obtained. The phenolic resin balls obtained above were heated up to 1000° C. at a rate of 2° C. / min under the protection of nitrogen, and activated with water vapor at this temperature for 1 hour. The specific surface area obtained is 868m 2 / g, spherical activated carbon with mesopore diameter concentrated at 2.6nm.

Embodiment 2

[0017] Prepare 1000ml of an aqueous solution containing 6wt% sodium dodecylsulfonate and place it in a three-necked flask. Put 20g of phenol, 13g of formaldehyde, 0.85g of sodium hydroxide and 6.47g of ionic liquid 1-carboxyethyl-3-methylimidazole trifluorosulfonimide salt into 1000ml of the above In the dispersion, stir for 20min. Then the temperature was raised to 75°C at a rate of 0.8°C / min under stirring, and the reaction was carried out at this temperature for 1.5h. That is, phenolic resin balls are obtained. The phenolic resin balls obtained above were heated up to 950° C. at a rate of 3° C. / min under the protection of nitrogen, and activated with water vapor at this temperature for 1 hour. The specific surface area obtained is 820m 2 / g, spherical activated carbon with mesopore diameter concentrated at 2.4nm.

Embodiment 3

[0019] Prepare 1000ml of an aqueous solution containing 7wt% polyvinyl butyral, and place it in a three-necked flask. Put 20g of phenol, 13g of formaldehyde, 0.85g of sodium hydroxide and 3.76g of ionic liquid 1-carboxyethyl-3-methylimidazole dinitrile amine salt into 1000ml of the above dispersion in a molar ratio of 1:2:0.1:0.08 , stirred for 30min. Then the temperature was raised to 80°C at a rate of 1°C / min under stirring, and the reaction was carried out at this temperature for 2h. That is, phenolic resin balls are obtained. The phenolic resin balls obtained above were heated up to 900°C at a rate of 4°C / min under the protection of nitrogen, and activated with water vapor at this temperature for 1.5h. The specific surface area obtained is 935m 2 / g, spherical activated carbon with mesopore diameter concentrated at 2.8nm.

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Abstract

The invention discloses a method for preparing spherical activated carbons with narrow mesoporous size distribution, which comprises the following steps of: preparing water liquid with 5-10 wt % of a dispersant so as to obtain dispersion liquid; adding phenol, formaldehyde, sodium hydroxide and ionic liquid into the dispersion liquid, and stirring for 10-60 min; raising the temperature of the obtained object to 70-85 DEG C at a speed of 0.5-2 DEG C / min in a stirring state, and carrying out reaction on the obtained object for 1-3 hours at the temperature so as to obtain phenolic resin balls, wherein the adding amount of each material is as follows: through calculating by adding each material in 1000 ml of the dispersion liquid and taking 20g phenol as a benchmark, the mole ratio of the phenol, the formaldehyde, the sodium hydroxides and the ionic liquid is 1:2:0.1:(0.05-0.5); and raising the temperature of the obtained phenolic resin balls to 800-1000 DEG C at a speed of 2-5 DEG C / min under the protection of nitrogen, and carrying out water vapor activation on the phenolic resin balls for 1-2 hours at the temperature so as to obtain spherical activated carbons with narrow mesoporous size distribution. The method disclosed by the invention has the advantages of simple process route and less process steps, and capability of having narrow mesoporous size distribution.

Description

technical field [0001] The invention belongs to a preparation method of activated carbon, in particular to a preparation method of spherical activated carbon with narrow mesopore size distribution. Background technique [0002] Spherical activated carbon can be widely used in environmental protection, chemical defense, catalyst carrier, gas separation due to its rich pore structure, high specific surface area, good sphericity, high mechanical strength, acid and alkali resistance and high temperature resistance. and solvent recovery. Spherical activated carbon rich in mesopores exhibits good adsorption and catalytic properties when adsorbing middle molecular species or supporting catalysts. Lu Chunxiang, Ling Licheng, Qi Hongyun, Liang Xiaoyi (Patent Publication No.: CN1480397A, CN1480399A, CN1631516, CN101062770A) etc. use spherical resin as raw material, after swelling, deep sulfonation, gradient concentration pickling or air preoxidation or chloromethylation, etc. Spheri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/10C01B31/14C01B32/336C01B32/384
Inventor 孙国华李开喜
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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