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Preparation method of high specific surface area coal mass active carbon

A technology of coal-based activated carbon and high specific surface area, which is applied in the field of activated carbon preparation in the chemical industry, which can solve the problems of lack of market competitiveness, incomplete post-processing, and high product prices, and achieve low cost, low ash content, and cost savings Effect

Inactive Publication Date: 2007-04-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantages of the above methods are serious pollution, incomplete post-treatment, and the high cost of such raw materials, resulting in expensive products and lack of market competitiveness.

Method used

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  • Preparation method of high specific surface area coal mass active carbon
  • Preparation method of high specific surface area coal mass active carbon

Examples

Experimental program
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Effect test

example 1

[0022] Mix 100g of coal-based carbonized material crushed to 20-40 mesh and activator at a ratio of 1:4, add appropriate amount of water to infiltrate, place in a tubular reactor, and then pretreat at 400°C for 0.5h under nitrogen protection, and then Activate at 900°C for 2.5h, then continue to cool to room temperature in a nitrogen atmosphere, and the reactor is operated in a continuous rotation state during the whole process.

[0023] How to recover the by-product potassium metal before discharging and store it in kerosene.

[0024] The activating material is first washed with distilled water, and the residual activator KOH is recovered through waste liquid recovery, and then repeatedly pickled with HCl and alkaline washed with NaOH for 3 times each, and then washed with a large amount of water until the pH value is 6-7, and then heated at 120 ° C. Dry for 12h. After testing, the iodine adsorption value of the activated carbon product was 2657mg / g, the yield was 55%, and t...

example 2

[0026] Mix 100g of coal-based carbonized material pulverized to 20-40 mesh and activator according to the ratio of 1:4, add an appropriate amount of water to infiltrate, place it in a tubular reactor, and then put it under nitrogen (V N2 ==400cm 3 / min) under the protection of 350 ° C for 2 h, and then activated at 850 ° C for 1 h, and then continued to cool to room temperature in a nitrogen atmosphere, and the reactor was intermittently rotated during the whole process. The by-product potassium metal is recovered before discharging and stored in kerosene. The activating material is washed with water first, and the activator is recovered by recycling the waste liquid, and then repeatedly pickled with HCl and washed with NaOH alkali twice, and then washed with a large amount of water until the pH value is 6-7, and then dried at 100°C for 10 hours. The iodine adsorption value of the activated carbon product obtained by this method is 2560mg / g, the yield is 55%, and the specific...

example 3

[0028] Mix 100g of coal-based carbonized material pulverized to 20-40 mesh and activator according to the ratio of 1:3.5, add an appropriate amount of water to infiltrate, place it in a tubular reactor, and then put it under nitrogen (V N2 =200cm 3 / min) under the protection of 450 ° C for 1 h, then activated at 600 ° C for 4 h, and then continued to cool to room temperature in a nitrogen atmosphere, and the reactor was operated continuously during the whole process. The by-product potassium metal is recovered before discharging and stored in kerosene. The activating material is first washed with water, and the activator is recovered by recycling the waste liquid, and then repeatedly washed with oxalic acid and NaOH alkali for 4 times, and then washed with a large amount of water until the pH value is 6-7, and then dried at 150°C for 14 hours. The iodine adsorption value of the activated carbon product obtained by this method is 2500mg / g, the yield is 58%, and the specific su...

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Abstract

The present invention discloses a preparation method of coal active carbon with high specific area. Said method includes the following steps: pulverizing the coal carbonization material into 24-40 meshes, fully and uniformly mixing the pulverized coal carbonization material with KOH according to the ratio of 1:1-7, placing them into a tubular reactor, then activating at 600-880 deg.C for 2-5 h under the protection of nitrogen gas, cooling to 20-30 deg.C, recovering by-product metal potassium before discharge of material and storing it in kerosene; firstly, using distilled water to wash the residual activated material, recovering residual KOH, repeatedly acid-washing and caustic washing, then using distilled water to wash until the pH value is 6-7, drying at 100-150 deg.C for 10-15 h so as to obtain the coal active carbon.

Description

technical field [0001] The invention belongs to the technical field of activated carbon preparation in the chemical industry, and in particular relates to a preparation method of coal-based activated carbon with a high specific surface area. Background technique [0002] When selecting raw materials in the industrial production process of activated carbon, factors such as the grade, price and resource supply of raw materials must first be considered. Activated carbon adsorption has become one of the powerful means to prevent and control environmental pollution and purify the living environment of human beings. It has more and more uses and has a closer relationship with people. With the implementation of the natural forest protection project, domestic wood production has dropped sharply. In the process of activated carbon preparation, wood raw materials can no longer meet the needs of the rapid development of the national economy, especially the rapid development of high tec...

Claims

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Application Information

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IPC IPC(8): C01B31/02
Inventor 张会平王秀芳
Owner SOUTH CHINA UNIV OF TECH
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