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Method for preparing mesoporous asphalt base enriched spherical activated carbon

A pitch-based and activated carbon technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., to achieve the effects of reducing energy consumption, expanding application potential, and simple and easy operation

Active Publication Date: 2018-02-23
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in order to combine the advantages of isotropic pitch and mesophase pitch, some mesophase-containing pitch can be used as raw material to prepare low-cost and high-quality products, but there are few related patent reports

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 200g of coal tar pitch and 4g of anhydrous AlCl 3 Mix and grind into 200-mesh powder, put it into a high-pressure reactor, mix evenly and heat up to 400°C, keep the temperature for 4 hours to obtain pitch containing part of the mesophase. At this time, the content of the mesophase is 22.9wt%. Grind it into a 60 mesh powder. Take 20g of the powder, sonicate it in 10g of ethanol for 30min, then pour it into a reaction kettle, add 2000ml of water and 100g of polyvinyl alcohol, stir and raise the temperature to 150°C to obtain pitch balls. After the ball is oxidized and insoluble, it is activated by water vapor at 800°C for 1 hour to obtain a pitch-based spherical activated carbon rich in mesopores. The surface area of ​​the activated carbon is 875.1m 2 / g, the mesoporosity is 38.3%.

Embodiment 2

[0024] Mix 200g of natural asphalt with 8g of anhydrous FeCl 3 Mix and grind into 120-mesh powder, put it into a high-pressure reactor, stir evenly and raise the temperature to 300°C, and keep the temperature for 3 hours to obtain pitch containing part of the mesophase. At this time, the content of the mesophase is 25.5wt%. Grind and sieve it into 20-mesh powder. Take 20g of the powder and ultrasonicate it in a mixed solvent of 40g of ethanol and ethylene glycol (1:2 by weight) for 10min, then pour it into a reaction kettle, add 1200ml of water and 30g of polyvinyl alcohol, stir and heat up to 110°C. After the ball is oxidized and insoluble, it is activated by water vapor at 850°C for 1.5h to obtain a pitch-based spherical activated carbon rich in mesoporous pores. The surface area of ​​the activated carbon is 835.4m 2 / g, the mesoporosity is 37.3%.

Embodiment 3

[0028] Mix 200g petroleum pitch with 10g anhydrous CoCl 2 Mix and grind into 80-mesh powder, put it into a high-pressure reactor, stir evenly and raise the temperature to 350°C, and keep the temperature for 4 hours to obtain pitch containing part of the mesophase. At this time, the content of the mesophase is 37.3wt%. Grind and sieve it into 20-mesh powder. Take 20g of the powder, ultrasonicate it in 30g of methanol solvent for 60min, then pour it into the reaction kettle, add 1000ml of water, 5g of polyvinyl alcohol, stir and raise the temperature to 150°C. After the ball is oxidized and insoluble, it is activated by water vapor at 750°C for 0.5h to obtain a pitch-based spherical activated carbon rich in mesopores. The surface area of ​​the activated carbon is 885.1m 2 / g, the mesoporosity is 43.7%.

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Abstract

The invention discloses a method for preparing mesoporous asphalt base enriched spherical activated carbon. The method comprises the following steps: grinding an asphalt raw material and a Lewis acidcatalyst into micro powder, putting into a high-pressure reaction kettle, performing direct sealing heating to reaction temperature, stirring, performing a constant-temperature reaction so as to obtain asphalt with a part of a middle phase, grinding the asphalt, performing ultrasonic treatment in an organic solvent, pouring into the reaction kettle, adding a surfactant, namely polyvinyl alcohol, and water, performing stirring heating to obtain suspended spheres, oxidizing the spheres without melting, and performing water steam activation, thereby obtaining the mesoporous asphalt base enrichedspherical activated carbon. The mesoporous asphalt base enriched spherical activated carbon has the advantages of being simple in method, free of additives, large in specific surface area, good in heat conductivity and high in mesopore content.

Description

technical field [0001] The invention belongs to the field of preparation of spherical activated carbon, and in particular relates to a preparation method of pitch-based spherical activated carbon rich in mesopores. Background technique [0002] Spherical activated carbon has a series of excellent characteristics such as high specific surface area, large pore volume, high bulk density, good biocompatibility, and good hydrodynamic properties, making it widely used in the fields of catalyst carriers, adsorbents, and drug carriers. [0003] Pitch has the advantages of high carbon content, good fluidity, easy graphitization, and excellent compatibility with carbonaceous aggregates. It is usually used as the precursor of spherical activated carbon. In the patent CN1224034A, asphalt, organometallic compound and aromatic solvent are mixed at high temperature in an autoclave according to a certain ratio to prepare asphalt raw material containing metal particles, which is formed into ...

Claims

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Application Information

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IPC IPC(8): C01B32/318C01B32/336
Inventor 李开喜张果丽管涛涛
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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