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Method for preparing pitch-based spherical activated carbon

An activated carbon, pitch-based technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of long oxidation cycle, complex process, high energy consumption, and achieve low cost, simple process, and reduced environmental pollution. Effect

Inactive Publication Date: 2019-03-01
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

[0006] Aiming at the disadvantages of high raw material cost, complex process, high pollution, high energy consumption and long oxidation cycle in the prior art, the purpose of the present invention is to provide a kind of medium and low temperature asphalt as raw material, which can be formed into pellets without adding naphthalene and can be quickly oxidized Stabilization, after carbonization activation, obtains the preparation method of pitch-based spherical activated carbon

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Mix petroleum asphalt (softening point is 45°C) with anhydrous aluminum chloride (addition amount accounts for 5% of the mass of petroleum asphalt) and add it into the reaction kettle. Under the protection of nitrogen, heat to 150°C, stir and mix and keep the temperature for 3h , followed by vacuuming, cooling and discharging, to obtain modified asphalt (softening point: 117°C) which can be used for pelletizing. The asphalt balls are prepared by emulsifying into balls, and then the asphalt balls are directly placed in the oxidation furnace without any treatment. Air purge at 30°C h -1 The heating rate is increased to 250 °C, and the temperature is maintained for 1 hour to obtain stabilized pitch balls, and then to activate the charcoal to obtain pitch-based spherical activated carbon. The prepared spherical activated carbon has a uniform particle size (average particle size is 0.8mm), a sphericity of 0.98, a strength of 95%, and a specific surface area of ​​1100m 2 g ...

Embodiment 2

[0018] Mix coal tar pitch (softening point is 80°C) and chloroform (addition amount accounts for 10% of petroleum pitch) and add it into the reaction kettle. Under the protection of nitrogen, stir and mix after heating to 280°C. Vacuum, cool down and discharge the material to obtain modified asphalt (softening point: 117°C) that can be used for pelletizing. The asphalt pellets are prepared by emulsifying and pelletizing, and then the asphalt pellets are directly placed in the oxidation furnace without any treatment. Sweep at 60℃ h -1 The heating rate is increased to 290°C, and the temperature is kept constant for 3 hours to obtain stabilized pitch balls, and then carbon-activated to obtain pitch-based spherical activated carbon. The prepared spherical activated carbon has a uniform particle size (average particle size is 0.4mm), a sphericity of 0.95, a strength of 96%, and a specific surface area of ​​1,220m 2 g -1 .

Embodiment 3

[0020] Mix natural asphalt (softening point: 60°C) and paraformaldehyde (addition amount accounted for 15% of the petroleum asphalt mass) evenly and add it to the reaction kettle. Under the protection of nitrogen, stir and mix after heating to 300°C and keep the temperature for 2 hours, then Vacuumize, cool down and discharge the material to obtain modified asphalt (softening point is 127°C) that can be used for pelletizing. The asphalt pellets are prepared by emulsifying pellets, and then the asphalt pellets are directly placed in the oxidation furnace without any treatment. Purge at 50°C h -1 Raise the temperature to 350°C at a constant temperature for 2 hours to obtain stabilized asphalt balls, and then activate them to obtain pitch-based spherical activated carbon. The prepared spherical activated carbon has a uniform particle size (average particle size is 0.3mm), a sphericity of 0.95, a strength of 97%, and a specific surface area of ​​1298m 2 g -1 .

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Abstract

The invention discloses a method for preparing pitch-based spherical activated carbon. The method comprises the steps that a medium-low temperature asphalt raw material and a modifier are added into areaction kettle and stirred and mixed after being heated to 100-300 DEG C under the protection of nitrogen, constant temperature is performed for 0.5-4 h, then vacuum pumping is performed, cooling and discharging are performed, modified asphalt used for balling is obtained, an asphalt ball is obtained by an emulsification balling method, then the asphalt ball is directly placed in an oxidizing furnace for air purge without any treatment and heated up to 250-350 DEG C at a heating rate of 30-60 DEG Ch<-1>, constant temperature is performed for 0.5-4 h, a stabilized asphalt ball is obtained, then the asphalt ball is subjected to carbonization-excitation, and the pitch-based spherical activated carbon is obtained. The pitch-based spherical activated carbon has the advantages of good degree of sphericity, higher strength and being capable of being produced in a large scale and continuous mode.

Description

technical field [0001] The invention belongs to the field of preparation of pitch-based spherical activated carbon, and in particular relates to a method for preparing pitch-based spherical activated carbon by using medium-low temperature pitch as a raw material without adding naphthalene. Background technique [0002] Pitch-based spherical activated carbon has been widely used in blood purification, catalyst carrier, organic solvent recovery, precious metal recovery and other fields due to its rich source of raw materials, low price, high mechanical strength, high sphericity, good broad-spectrum adsorption performance, and fast adsorption and desorption speed. be promoted. However, its preparation process and equipment are relatively complicated, and there are still some technical problems. At present, the basic process of preparing pitch-based spherical activated carbon: modulation of pitch→balling→(pre)oxidation→carbonization→activation. At present, most of the patents ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/318C01B32/336
CPCC01B32/318C01B32/336
Inventor 李开喜管涛涛张果丽
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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