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Preparation method of active carbon

A technology of activated carbon preparation and activator, which is applied in the direction of chemical instruments and methods, and other chemical processes, which can solve the problems of hidden dangers in production safety, explosion, and hidden safety production hazards of KOH activation, and achieve the effect of easy control

Inactive Publication Date: 2015-05-13
郭晶晶
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Potassium is a very active metal element. It can react with moisture in the air to generate hydrogen, and release a large amount of heat, resulting in an explosion, which brings a huge hidden danger to the safe production of KOH activation.
At the same time, during the escape process of elemental potassium, part of it will freeze in the pipeline of the activation furnace, so that the pipeline will be blocked, which will also bring hidden dangers to safe production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 10 kg of petroleum coke crushed and sieved to 40-60 mesh, then add 40 kg of KOH and 1 kg of calcium carbonate, and mix in a solid state. After the mixed material was dried at 200° C. for 3 hours, under the protection of nitrogen, and the pressure in the activation furnace was kept at 3 atm, the temperature was raised to 800° C. for activation for 3 hours. The activated material is taken out after being cooled to below 100°C in nitrogen. After washing the activation material with water for 3-4 times, wash with 5% (mass ratio) hydrochloric acid for 1-2 times, and then wash with water until the pH of the filtrate reaches 6-7. The product is dried at 150°C to obtain super activated carbon with a specific surface area of ​​3500m2 / g and an ash content of 0.5%. The yield of super activated carbon during the activation process is 56%.

Embodiment 2

[0024] Weigh 10 kg of petroleum coke crushed and sieved to 40-60 mesh, then add 20 kg of KOH and 0.4 kg of calcium bicarbonate, and mix in a solid state. After the mixed material was dried at 200°C for 2h, under the protection of nitrogen, the vacuum degree in the activation furnace was kept at 400mmHg. Raise the temperature to 650°C for activation for 4h. Take out the activated material after cooling down to below 100°C. After washing the activation material with water for 3 to 4 times, wash with 5% (mass ratio) hydrochloric acid for 1 to 2 times, and then wash with water until the pH of the filtrate reaches 6-7. The product is dried at 150°C to obtain super activated carbon with a specific surface area of ​​2600mz / g and an ash content of 0.6%. The yield of super activated carbon during the activation process is 70%.

Embodiment 3

[0026] Weigh 10 kg of petroleum coke crushed and sieved to 40-60 mesh, then add 30 kg of KOH and 0.8 kg of calcium carbonate, and mix in a solid state. After the mixed material was dried at 300°C, under the protection of nitrogen, and the pressure in the activation furnace was kept at 2 atm, the temperature was raised to 800°C for activation for 3 hours. The activated material is taken out after being cooled to below 100°C in nitrogen. After washing the activation material with water for 3 to 4 times, wash with 5% (mass ratio) hydrochloric acid for 1 to 2 times, and then wash with water until the pH of the filtrate reaches 6-7. The product is dried at 150°C to obtain super activated carbon with a specific surface area of ​​3000m2 / g and an ash content of 1.0%. The yield of super activated carbon during the activation process is 63%.

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Abstract

The invention discloses a preparation method of active carbon. The preparation method comprises following steps: (1), raw material carbon, activating agent KOH, and an assistant activator are mixed at a weight ratio of 1:1-7:0.001-0.1; (2) an obtained mixture is subjected to drying and dewatering at 200 to 300 DEG C for 1 to 3h, is heated to an activation temperature of 600 to 850 DEG C at a heating speed of 1 to 7 DEG C / min with protection of inert gas under vacuum or high pressure conditions, and activation is carried out for 1 to 4h; (3), an obtained activated material is cooled to a temperature lower than 100 DEG C with protection of inert gas, is washed with water for 3 to 4 times, is washed with hydrochloric acid for 1 to 2 times, is washed with water until pH of an obtained filtrate reaches 6 to 7, and an obtained product is dried at 120-150 DEG C until weight is constant so as to obtain active carbon products. According to the preparation method, KOH is taken as an activating agent; and the preparation method is safe and reliable, is convenient for controlling, and is capable of satisfying demands of industrial production.

Description

technical field [0001] The invention relates to a method for preparing activated carbon, which belongs to the technical field of chemical industry. Background technique [0002] Activated carbon is a porous carbon material with highly developed pore structure and large specific surface area. As an excellent adsorbent, it has been widely used in environmental protection, chemical industry, food industry, hydrometallurgy, pharmaceutical refining, Military chemical protection and other fields. With the application of activated carbon in new fields such as electrode materials of super electric double layer capacitors, catalyst carriers, gas separation, hydrogen and natural gas storage materials, ordinary activated carbon with a specific surface area of ​​800-1500m2jg has limited adsorption capacity and cannot meet its application requirements. Therefore, the development of super activated carbon with a specific surface area of ​​more than 2000m2 / g has become a new hot spot in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/12B01J20/20
Inventor 郭晶晶
Owner 郭晶晶
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