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Preparation method of active carbon

An activated carbon and carbonization technology, which is applied in the field of coal chemical industry, can solve the problems of easy melting of asphalt and low specific surface area of ​​activated carbon, and achieve the effects of mild reaction conditions, high specific surface area, and shortened activation process

Inactive Publication Date: 2015-09-30
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a kind of preparation method of activated carbon, to solve the existing process of preparing activated carbon by direct coal liquefaction asphalt, in the heat treatment process, coal direct liquefaction asphalt is easy to melt, thus resulting in the relatively small specific surface area of ​​the activated carbon. low problem

Method used

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Examples

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Effect test

preparation example Construction

[0018] As described in the background art, in the existing process for preparing activated carbon from direct coal liquefaction pitch, the direct coal liquefaction pitch tends to melt during the heat treatment process, which leads to the problem of low specific surface area of ​​the prepared activated carbon. In order to solve the above problems, the present invention provides a method for preparing activated carbon, which includes: pre-oxidation process: the direct coal liquefaction pitch is subjected to pre-oxidation reaction to obtain pre-oxidized pitch; carbonization process: the pre-oxidized pitch is mixed with an activator , carbonization reaction is carried out to obtain carbonized pitch; activation process: the carbonized pitch is activated by heating to obtain activated carbon.

[0019] In the existing activated carbon preparation process, the direct liquefaction of raw coal asphalt is prone to melting, which leads to the problem of low specific surface area of ​​activ...

Embodiment l

[0036] Crushing coal direct liquefaction bitumen to 100 mesh, with pre-oxidant KNO 3 Mixing in a solid state was performed at a weight ratio of 1:0.3 to obtain a first mixture. Under air conditions, the temperature of the first mixture was raised from room temperature to 300° C. at a heating rate of 5° C. / min, and pre-oxidized at a low temperature for 60 minutes to obtain pre-oxidized pitch.

[0037] The pre-oxidized asphalt was crushed to 100 mesh, and mixed with the activator KOH in a solid state at a weight ratio of 1:4 to obtain the second mixture. Under nitrogen condition, the temperature of the second mixture was raised from room temperature to 600° C. at a heating rate of 5° C. / min, and carbonized pitch was obtained after carbonization for 60 minutes.

[0038] At a heating rate of 3°C / min, continue to heat up the carbonized pitch to 800°C and activate it for 60 minutes to obtain activated carbon. After cooling, the activated carbon and water are washed and filtered at...

Embodiment 2

[0040] The coal direct liquefaction bitumen was crushed to 60 mesh, and the temperature was raised from room temperature to 400 °C at a heating rate of 3 °C / min under air conditions, stirred, and pre-oxidized for 150 min to obtain pre-oxidized bitumen.

[0041] Crush the pre-oxidized asphalt to 100 mesh, and mix it with the activator KOH at a weight ratio of 2:7 in a solid state to obtain a mixture. Under nitrogen conditions, the above mixture was heated from room temperature to 620°C at a heating rate of 3°C / min, and carbonized pitch was obtained after carbonization for 90 minutes.

[0042] At a heating rate of 5°C / min, continue to heat up the carbonized pitch to 850°C and activate it for 90 minutes to obtain activated carbon. After cooling, the activated carbon and water are washed and filtered at a weight ratio of 1:5 to obtain a filtrate and a filter cake. The filtrate is regenerated by lime milk causticization to recover the activator KOH, and the filter cake is mixed wi...

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Abstract

The invention provides a preparation method of active carbon. The preparation method comprises the following processes: a pre-oxidation process: performing pre-oxidation reaction on coal direct liquefaction asphalt to obtain pre-oxidized asphalt; a carbonization process: mixing the pre-oxidized asphalt with an activating agent, and performing carbonization reaction to obtain carbonized asphalt; and an activation process: performing heating activation on the carbonized asphalt to obtain active carbon. The coal direct liquefaction asphalt is subjected to pre-oxidation at first to ensure that small-molecular substances and macromolecular substances in the asphalt can be crosslinked with each other to form high-melting-point pre-oxidized asphalt, so that the coal direct liquefaction asphalt can be beneficially inhibited from melting in the carbonization process; and then, the pre-oxidized asphalt is subjected to the processes of carbonization and quick activation to prepare the active carbon with a relatively high specific surface area. The preparation method of the active carbon, provided by the invention, is more moderate in reaction condition and simpler in process flow.

Description

technical field [0001] The invention relates to the field of coal chemical industry, in particular to a method for preparing activated carbon. Background technique [0002] my country is a country rich in coal, short of oil, and low in gas. Making full use of abundant coal resources and developing coal liquefaction technology is one of the important ways to reduce the excessive dependence on foreign crude oil and alleviate the shortage of oil resources and the tense supply and demand of oil products in our country. First, it is also an important measure to improve the utilization rate of my country's coal resources, reduce coal-burning pollution, and promote the coordinated development of energy, economy, and environment. Coal direct liquefaction technology is a clean coal technology that converts solid coal directly into clean and easy-to-transport liquid fuel or chemical raw materials through the catalytic action of catalysts under the conditions of high temperature, high p...

Claims

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Application Information

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IPC IPC(8): C01B31/12
Inventor 辛凡文李克健王洪学章序文
Owner CHNA ENERGY INVESTMENT CORP LTD
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