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Method for preparing active carbon

A technology for preparing activated carbon and drying, which is applied in the field of preparation of adsorption materials, can solve problems such as micropore blockage and carbon structure damage, and achieve the effects of increasing specific surface area, cleaning the process, and reducing expansion and damage

Inactive Publication Date: 2011-07-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to solve the problem of organic gas damage to carbon structure and micropore blockage when preparing activated carbon by traditional zinc chloride activation method, and to provide a method for preparing activated carbon. The activated carbon prepared from woody raw materials by this method has more microparticles The pore structure, specific surface area and adsorption performance are all higher than those of activated carbon prepared by traditional methods

Method used

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  • Method for preparing active carbon
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Examples

Experimental program
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Effect test

Embodiment 1

[0019] When the mass ratio of Chinese fir sawdust to zinc chloride is 1:1, the Chinese fir sawdust is immersed in the zinc chloride solution for 24 hours, the dried sample is weighed, placed in a reaction furnace, and vacuumized. The activated carbon is prepared under the conditions of system pressure of 10.5kPa, heating rate of 5°C / min, final cracking temperature of 400°C, and holding time of 60min. After testing, the iodine adsorption value of the prepared activated carbon was 916.28 mg / g, and the methylene blue adsorption value was 250.14 mg / g.

Embodiment 2

[0021] When the mass ratio of Chinese fir sawdust to zinc chloride is 1:1, the Chinese fir sawdust is immersed in the zinc chloride solution for 24 hours, the dried sample is weighed, placed in a reaction furnace, and vacuumized. The activated carbon was prepared under the condition that the system pressure was 50.5kPa, the heating rate was 5°C / min, the cracking final temperature was 500°C, and the holding time was 60min. After testing, the prepared iodine adsorption value is 976.68 mg / g, and the methylene blue adsorption value is 323.28 mg / g.

Embodiment 3

[0023] When the mass ratio of Chinese fir sawdust to zinc chloride is 1:1, the Chinese fir sawdust is immersed in the zinc chloride solution for 24 hours, the dried sample is weighed, placed in a reaction furnace, and vacuumized. Under the condition that the system pressure is 30.5kPa, the heating rate is 5°C / min, the final cracking temperature is 500°C, and the holding time is 60min, the SEM photo of the activated carbon is shown in the attached figure 2 . After testing, the prepared iodine adsorption value is 1008.69 mg / g, and the methylene blue adsorption value is 321.61 mg / g.

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Abstract

The present invention relates to a method for preparing active carbon, which comprises the following steps: crushing, sieving and drying woody raw materials, soaking the raw materials into a zinc chloride solution according to the mass ratio of the raw materials to zinc chloride of 1:1-4, and drying the solution; performing cracking activation under the vacuum condition, wherein the temperature rise rate is between 5 and 15 DEG C per minute, and the cracking final temperature is between 400 and 500 DEG C; maintaining at the cracking final temperature for approximately 1 hour; and performing acid washing, water washing and drying on the reaction product to obtain the product, namely the active carbon. Compared with active carbon prepared under the condition of normal pressure, the active carbon prepared by the method has the advantages that the micropore rate is improved by 5.34 to 13.18 percent, the specific surface area is increased by 6.21 to 20.31 percent, and the adsorption performance is superior. Moreover, a byproduct, namely biological oil, can be collected when the active carbon is obtained simultaneously, so that the resource utilization rate is high and the energy consumption is reduced.

Description

technical field [0001] The present invention relates to the preparation of adsorption materials, in particular to the preparation of activated carbon. Background technique [0002] Activated carbon has a rich pore structure and a huge specific surface area. The surface of the carbon contains a variety of oxygen-containing functional groups. It has good catalytic activity and chemical stability, high mechanical strength, and is easy to use repeatedly. This series of excellent characteristics makes it a kind of preparation A high-quality adsorbent that has attracted worldwide attention. [0003] Activated carbon can be made from various carbonaceous substances. In today's increasingly serious energy crisis and environmental problems, it is of great strategic significance to develop and utilize clean agricultural and forestry wastes and other biomass resources. For my country, a country with a large population, large agriculture, and large energy consumption, using biomass re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/08C01B31/12
Inventor 丘克强杨娟
Owner CENT SOUTH UNIV
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