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Preparing method of pitch-based spherical activated carbon with high heat conductivity

A high thermal conductivity, pitch-based technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems that are not suitable for the preparation of pitch-based spherical activated carbon, etc., to achieve lower final temperature, high gloss, and faster reaction speed effect

Active Publication Date: 2017-01-25
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

[0007] Patent CN98811907.2 "High Thermal Conductivity Carbon / Carbon Honeycomb Structure" uses carbon fiber to obtain a graphitizable carbon matrix through CVD / CVI densification, and then graphitizes to obtain a carbon / carbon composite honeycomb with a thermal conductivity greater than 200W / m.k Structural materials; similarly, the patent CN200410012434.X "a method for rapidly preparing carbon / carbon composite materials with high thermal conductivity" mixes the mesophase pitch-based chopped carbon fiber and the treated mesophase pitch uniformly in proportion, heats up and pressurizes , and then increase the temperature until reaching the graphitization temperature to produce carbon / carbon products with higher thermal conductivity, but these processes are not suitable for the preparation of pitch-based spherical activated carbon

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] After uniformly mixing 290°C softening point pitch, naphthalene, 200 mesh graphite powder and 400 mesh mesophase pitch powder (mass ratio: 1:1) with a mass ratio of 1:0.25:0.05, react at 350°C for 5 hours to obtain Modified asphalt: The modified asphalt is crushed and screened to obtain 0.5mm asphalt particles, and then added to an aqueous solution containing 5wt% polyvinyl alcohol, wherein the mass of polyvinyl alcohol is 10% of the asphalt, and stirred at 150°C 1h, obtain asphalt ball; The obtained asphalt ball contains 3% (volume ratio) SO 2 In the air, according to the heating rate of 2 °C / min, it was raised to 180 °C and reacted for 5 hours to obtain oxidized asphalt balls, and the air was switched to N 2 Afterwards, the temperature was raised from room temperature to 1000°C at a heating rate of 20°C / min and stayed for 0.1h, and then switched to steam activation for 0.5h to obtain pitch activated carbon spheres. Put the asphalt activated carbon balls and urea into...

Embodiment 2

[0029] Mix 260°C softening point asphalt, naphthalene, and graphite worms at a mass ratio of 1:0.35:0.01, and react at 300°C for 3 hours to obtain modified asphalt; the modified asphalt is crushed and screened to obtain 0.1mm asphalt particles, and then Add it into an aqueous solution containing 1wt% polyvinyl alcohol, wherein the mass of polyvinyl alcohol is 5% of the asphalt, and stir at 85°C for 3 hours to obtain asphalt balls; The heating rate of 5°C / min was increased to 280°C for 2 hours to obtain oxidized pitch pellets. After switching the air to N2, the temperature was raised from room temperature to 800°C at a heating rate of 8°C / min for 1 hour, and then switched to steam activation for 3 hours. Get Pitch Activated Carbon Balls. Put pitch activated carbon balls and ammonium bicarbonate into the autoclave at a mass ratio of 1:0.3, heat it up to 300°C at a rate of 10°C / min after sealing, keep the temperature constant for 0.5h, and then cool down to obtain the product. T...

Embodiment 3

[0031] Mix 300°C softening point pitch, naphthalene, and 5mm mesophase pitch carbon fibers with a mass ratio of 1:0.4:0.05, and then react at 280°C for 5 hours to obtain modified pitch; the modified pitch is crushed and screened to obtain 0.8mm pitch granules, and then added to an aqueous solution containing 4wt% polyvinyl alcohol, wherein the mass of polyvinyl alcohol is 8% of the asphalt, and stirred at 90°C for 2 hours to obtain asphalt balls; In the air, the temperature was raised to 200°C at a heating rate of 3°C / min and reacted for 1 hour to obtain oxidized asphalt balls. After switching the air to N2, the temperature was raised from room temperature to 850°C at a heating rate of 12°C / min and stayed for 0.5h, and then switched to CO2 Activated for 5 hours to obtain asphalt activated carbon balls. Put pitch activated carbon balls and ammonium carbonate into the autoclave at a mass ratio of 1:0.2, heat it up to 250°C at a rate of 5°C / min after sealing, keep the temperature...

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Abstract

The invention discloses a preparing method of pitch-based spherical activated carbon with high heat conductivity. The preparing method comprises the steps of: uniformly mixing high soften point asphalt, naphthalene with a heat conduction agent, and reacting the mixture to prepare modified asphalt; adding modified asphalt into aqueous polyvinyl alcohol, and stirring for 0.5-3 h at 85-150 degrees centigrade to prepare pitch-based spheres; oxidizing and activating pitch-based spheres without dissolving to prepare pitch-based activated carbon spheres; placing pitch-based activated carbon spheres and a nitrogen-containing compound into a high-pressure kettle according to the mass ratio of 1: (0.1-0.3), sealing the kettle, heating the kettle to 150-300 degrees centigrade with the rate of 3-10 degrees centigrade / min, keeping the kettle for 0.5-3h at constant temperature and then cooling the kettle to prepare pitch-based spherical activated carbon. The pitch-based spherical activated carbon has the advantage of excellent heat conductivity.

Description

technical field [0001] The invention belongs to a preparation method of pitch-based spherical activated carbon with high thermal conductivity. Background technique [0002] Pitch-based spherical activated carbon is currently a high-end activated carbon material, but its preparation involves high temperatures from room temperature to above 900°C, and the thermal conductivity of pitch itself is very poor, roughly 0.1 W / (m.k), so that during the heating process , Asphalt absorbs heat very slowly, which greatly affects the diffusion of heat from the asphalt surface to the interior of the asphalt, especially when the heating rate is fast, the temperature difference between the asphalt surface and the interior of the asphalt is large, resulting in poor processing performance of asphalt. In addition, the poor thermal conductivity of activated carbon itself also limits the expansion of its application fields. [0003] The application numbers are 201310673124.1 "Method for preparing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/312C01B32/336
CPCC01P2006/32
Inventor 李开喜
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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