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A kind of preparation method of honeycomb foam wall hollow carbon sphere

A honeycomb and foam technology, applied in the field of hollow carbon sphere preparation, can solve the problems of complex process, high equipment requirements, high raw material cost, etc., and achieve the effect of simple operation, low energy consumption and low cost

Active Publication Date: 2021-03-26
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

[0005] The present invention aims at the deficiencies of the prior art, such as high raw material cost, complex process, and high requirements for equipment, and provides a method for preparing honeycomb-shaped foam-walled hollow carbon spheres with no template and no foaming agent and both foamed carbon and hollow carbon.

Method used

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  • A kind of preparation method of honeycomb foam wall hollow carbon sphere
  • A kind of preparation method of honeycomb foam wall hollow carbon sphere
  • A kind of preparation method of honeycomb foam wall hollow carbon sphere

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Put petroleum asphalt (softening point is 45 ℃) into the reaction kettle after crushing and sieving together with anhydrous aluminum chloride (accounting for 2% of the total weight of petroleum asphalt), start stirring after heating to asphalt softening temperature, continue to heat up to 200 After constant temperature for 8 hours at ℃, and then rapid pressure relief and cooling, the honeycomb foam asphalt can be obtained. Then it was dried, ground, and sieved into 10-mesh particles, and 10 g was weighed and directly added to 500 ml of 0.5 wt % polyvinyl alcohol aqueous solution, the stirring rate was 200 r / min, and the temperature was raised to 130 ° C to suspend into balls. After discharging, place the ball in an oxidation furnace for air purging, raise the temperature to 280°C at a rate of 8°C / h, keep the temperature constant for 0.5h, and then conduct water vapor activation at 800°C for 1h to obtain a hollow cellular foam wall. charcoal balls. Its ball diameter is ...

Embodiment 2

[0029] Crush and sieve coal tar pitch (softening point: 78°C) and add it into the reaction kettle together with chloroform (accounting for 10% of the total weight of coal tar pitch), heat to the softening temperature of the pitch and start stirring, continue to heat up to 300°C and keep the temperature for 4 hours , followed by rapid pressure relief and cooling to obtain honeycomb foam asphalt. Then it was dried, ground, and sieved into 50-mesh particles, and 5 g was weighed and directly added to 500 ml of 2 wt % polyvinyl alcohol aqueous solution, the stirring speed was 300 r / min, and the temperature was raised to 160° C. to suspend into balls. After discharging, place the ball in an oxidation furnace for air purging, raise the temperature to 340°C at a rate of 10°C / h, keep the temperature constant for 1 hour, and then conduct water vapor activation at 900°C for 1 hour to obtain a hollow carbon with a cellular foam wall ball. Its ball diameter is 1220μm, BET specific surface...

Embodiment 3

[0031] The natural asphalt (softening point is 65 ℃) is pulverized and sieved and added to the reaction kettle together with anhydrous ferric chloride (accounting for 20% of the total weight of natural asphalt), heated to the softening temperature of the asphalt and started stirring, and continued to heat up to 250 After constant temperature for 6 hours at ℃, and then rapid pressure relief and cooling, the honeycomb foam asphalt can be obtained. Then it was dried, ground, and sieved into 30-mesh particles, and 35 g was weighed and directly added to 500 ml of 5 wt % polyvinyl alcohol aqueous solution, the stirring rate was 400 r / min, and the temperature was raised to 180 ° C to suspend into balls. After discharging, place the ball in an oxidation furnace for air purging, raise the temperature to 350°C at a rate of 13°C / h, keep the temperature constant for 3 hours, and then conduct water vapor activation at 950°C for 2 hours to obtain a hollow carbon with a cellular foam wall ba...

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Abstract

The invention provides a preparation method of a honeycomb-shaped foam-walled hollow carbon sphere. A mid-temperature pitch raw material is mixed with a modifying agent after being smashed and screened, the mixture is stirred and heated in a high pressure reaction still, then subjected to rapid pressure relief and cooling, and the honeycomb-shaped foam pitch is prepared depending on foaming of light components of pitch. Pitch is directly added into a polyvinyl alcohol water solution after being smashed, and subjected to warming, stirring and suspension to form spheres, and the honeycomb-shapedfoam-walled hollow carbon spheres are obtained after oxidative stabilization and vapour activation are conducted. The method has the advantages that the cost is low, the technology is simple, industrial popularization is easy and the like, the prepared hollow carbon spheres are good in sphericity degree and uniform in grain size, and the shell layer is of a honeycomb-shaped foam structure.

Description

technical field [0001] The invention belongs to the field of preparation of hollow carbon spheres, in particular to a method for preparing hollow carbon spheres with cellular foam walls. Background technique [0002] Compared with ordinary granular and columnar activated carbon, spherical activated carbon has the characteristics of high specific surface area, good hydrodynamic performance, acid / alkali resistance, high bulk density and mechanical strength, and good electrical and thermal conductivity, making them widely used in many fields. Wide range of applications. In recent years, hollow spherical carbon materials have attracted more attention due to their unique hollow structure and excellent physical and chemical properties. A large number of studies have shown that hollow carbon microspheres have low density, high thermodynamic stability, superior electrical and thermal conductivity, and large internal space, making them ideal for drug carriers and sustained release, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05
Inventor 李开喜管涛涛张果丽
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI