Method for preparing activated carbon with low-rank coal extracted solid

A technology for preparing activated carbon and low-rank coal, which is applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problem that the extraction residue cannot be well utilized, and achieve uniform internal and external pore volume, high quality, and simple steps Effect

Inactive Publication Date: 2018-01-23
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method for preparing activated carbon by using the extraction residue of low-rank coal, wherein the extraction residue of the existing low-rank coal cannot be well utilized, and the corresponding research proposes And make full use of the method of physical activation or chemical activation to process the extraction residue, the activated carbon prepared by this method is of high quality, has a high specific surface area and pore volume, and its conversion efficiency is high, realizing the recovery of low-rank coal and Step utilization improves the economy of low-rank coal hot-solution extraction technology, and the method has simple steps and high conversion efficiency, which is suitable for large-scale promotion and use

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  • Method for preparing activated carbon with low-rank coal extracted solid

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Embodiment 1

[0037] Using a kind of lignite (LY) as the original low-rank coal, firstly mix lignite and organic solvent (1-methylnaphthalene) at a mass ratio of 1:10, place it in a reaction kettle, and heat it up to a temperature of 350°C , keep warm for 60min, and then conduct in-situ thermal filtration; obtain the extraction residue. Using lignite extraction residue as raw material, it was first pyrolyzed in a horizontal tube furnace at 500°C under a nitrogen atmosphere for 30 minutes. Then the temperature was raised to 900°C at 10°C / min, and then the nitrogen atmosphere was switched to CO 2 The atmosphere is physically activated, and a certain activation time of 0.25h is maintained to prepare high-quality activated carbon. The specific surface area of ​​the resulting activated carbon is 935m 2 / g, the pore volume is 0.742cm 3 / g.

Embodiment 2

[0039] Taking a kind of lignite (LY) as the original low-rank coal, firstly mix lignite and organic solvent (1-methylnaphthalene) at a mass ratio of 1:15, place it in a reaction kettle, and heat it to a temperature of 350°C by program heating. , keep warm for 75min, and then perform in-situ thermal filtration; obtain the extraction residue. Using lignite extraction residue as raw material, it was first pyrolyzed in a horizontal tube furnace at 450°C under a nitrogen atmosphere for 30 minutes. Then the temperature was raised to 900°C at 12°C / min, and then the nitrogen atmosphere was switched to CO 2 The atmosphere is physically activated, and a certain activation time of 0.5h is maintained to prepare high-quality activated carbon. The specific surface area of ​​the resulting activated carbon is 1302m 2 / g, the pore volume is 0.943cm 3 / g.

Embodiment 3

[0041] Taking a kind of sub-bituminous coal (SC) as the original low-rank coal, firstly, the sub-bituminous coal and the organic solvent (1-methylnaphthalene) were mixed in a mass ratio of 1:10, then placed in a reaction kettle, and heated to 350 °C by programming. After temperature, keep it warm for 60min, and then perform in-situ thermal filtration; obtain the extraction residue. The extraction residue of sub-bituminous coal was used as raw material, and it was first pyrolyzed in a horizontal tube furnace at 550°C and nitrogen atmosphere for 20 minutes. Then the temperature was raised to 920°C at 15°C / min, and then the nitrogen atmosphere was switched to CO 2 The atmosphere is physically activated, and a certain activation time is maintained for 1 hour to prepare high-quality activated carbon. The specific surface area of ​​the resulting activated carbon is 816m 2 / g, the pore volume is 0.409cm 3 / g.

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Abstract

The invention belongs to the field of coal chemical industry and activated carbon preparation and particularly relates to a method for preparing activated carbon with low-rank coal extracted solid. The method includes: subjecting low-rank coal to hot-solvent extraction process and collecting the extracted solid discarded after extraction process as a raw materials for preparation of the activatedcarbon; subjecting the collected extracted solid subjected to hot-solvent extraction process to pyrolysis in an inert gas atmosphere prior to physical activation treatment or chemical activation treatment to obtain the activated carbon. The activated carbon prepared is large in specific area and pore volume and is widely applied; gradient utilization of the low-rank coal is realized, economical efficiency in hot-solvent extraction technology of the low-rank coal is improved, and the activated coal with high quality is prepared; the method is simple in process, high in added value of products,good in economic and environmental benefits and broad in spreading use.

Description

technical field [0001] The invention belongs to the fields of coal chemical industry and activated carbon preparation, and more specifically relates to a method for preparing activated carbon by using low-order coal extraction residue as a raw material. Background technique [0002] my country's low-rank coal reserves are abundant, accounting for about 46% of China's proven coal reserves. Therefore, the rational development and utilization of low-rank coal is of great significance. However, the quality of low-rank coal is low: high moisture content, low carbon content, low calorific value, easy weathering and spontaneous combustion, difficult washing and storage, and poor economical long-distance transportation, which greatly restrict the development and utilization of low-rank coal. Limitation (Xing Baolin et al. Preparation and characterization of high-quality low-rank coal-based activated carbon. Journal of Coal Science, 2013, S1:217-222). Therefore, according to the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/33C01B32/336
Inventor 朱贤青李显姚洪徐凯童珊丁立志万天意刘诚胡振中
Owner HUAZHONG UNIV OF SCI & TECH
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