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Method for improving crushing strength of asphalt-based spherical activated carbon

A crushing strength, activated carbon technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problem of pitch-based spherical activated carbon without relevant literature, etc., achieve easy mass purchase, improve crushing strength, method simple effect

Active Publication Date: 2015-01-14
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

[0009] Despite the above studies, there is no relevant literature on improving the crush strength of pitch-based spherical activated carbons

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Mix 300°C softening point asphalt, naphthalene, and potassium iodide with a mass ratio of 1:0.5:0.1, and react at 230°C for 5 hours to obtain modified asphalt; the modified asphalt is crushed and screened to obtain 0.1mm asphalt particles, and then added into an aqueous solution containing 1 wt% polyvinyl alcohol, wherein the mass of polyvinyl alcohol is 5% of the asphalt, and stirred at 85°C for 3 hours to obtain asphalt balls; the temperature of the asphalt balls is raised from room temperature to 230 ℃, stay for 5h to obtain oxidized asphalt balls; switch the air to N 2 Afterwards, the temperature was raised from room temperature to 800°C at a heating rate of 10°C / min for 2 hours, and then switched to steam activation for 3 hours to obtain the product.

[0025] The product has a single particle crushing strength of 10.2N and a specific surface area of ​​1450m 2 / g, the ball diameter is between 0.08-0.12mm.

Embodiment 2

[0027] Mix 240°C softening point asphalt, naphthalene, and sodium iodide with a mass ratio of 1:0.2:0.3, and react at 350°C for 3 hours to obtain modified asphalt; the modified asphalt is crushed and screened to obtain 0.5mm asphalt particles. Then add it to an aqueous solution containing 5wt% polyvinyl alcohol, where the mass of polyvinyl alcohol is 10% of the asphalt, and stir at 150°C for 1 hour to obtain asphalt balls; the pitch balls are heated from room temperature at a heating rate of 30°C / h To 330 ℃, stay 2h, get oxidized asphalt balls; switch the air to N 2 Afterwards, the temperature was raised from room temperature to 1000°C at a heating rate of 3°C / min and stayed for 0.5h, and then switched to steam activation for 0.5h to obtain the product.

[0028] The product has a single particle crushing strength of 13.3N and a specific surface area of ​​1140m 2 / g, the ball diameter is between 0.3-0.65mm.

Embodiment 3

[0030] Mix 200°C softening point asphalt, naphthalene, and ammonium iodide with a mass ratio of 1:0.3:0.2, and react at 320°C for 4 hours to obtain modified asphalt; the modified asphalt is crushed and screened to obtain 1.5mm asphalt particles. Then add it to an aqueous solution containing 3wt% polyvinyl alcohol, wherein the mass of polyvinyl alcohol is 15% of the asphalt, and stir at 145°C for 0.5h to obtain pitch balls; the pitch balls are heated from room temperature at a rate of 60°C / h Raise the temperature to 350°C and stay for 5 hours to obtain oxidized asphalt balls; switch the air to N 2 Afterwards, the temperature was raised from room temperature to 900°C at a rate of 4°C / min for 1 hour, and then switched to CO 2 After activation for 5h, the product was obtained.

[0031] The single particle crushing strength of this product is 15.4N, and the specific surface area is 1320m 2 / g, the ball diameter is between 1.3-1.62mm.

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Abstract

The invention discloses a method for improving crushing strength of asphalt-based spherical activated carbon. The method comprises the following steps: evenly mixing high-softening-point asphalt, naphthalene and iodide, and reacting at 230-350DEG C to obtain modified asphalt; then adding into an autoclave containing 1-5wt% polyvinyl alcohol water solution, and stirring for 0.5-3h at 85-150DEG C, to obtain asphalt spheres; and oxidizing the asphalt spheres without melting, and performing carbonization and activation treatment to the asphalt spheres to obtain the asphalt-based spherical activated carbon product. The asphalt-based spherical activated carbon has the advantages of being capable of performing large-scale production and high in crushing strength.

Description

technical field [0001] The invention relates to a preparation method of activated carbon, in particular to a method for improving the crushing strength of pitch-based spherical activated carbon. Background technique [0002] Spherical activated carbon can be used in many fields. Among them, pitch-based spherical activated carbon prepared from asphalt is favored by researchers because of its low cost and easy availability of raw materials. Therefore, the research on it is mainly reflected in the following aspects: [0003] (1) Preparation: For example, the application number is 201310673124.1 "Method for preparing spherical activated carbon with water-soluble pitch", CN97101617.8 "Preparation method of spherical activated carbon", CN98104975.3 "Preparation method of pitch-based spherical activated carbon" and CN200910241779 .5 "An activated carbon microsphere and its preparation method"; [0004] (2) Promoting non-melting by oxidation or non-melting without oxidation: CN2011...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/10C01B32/336
Inventor 李开喜
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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