Preparation method of monodisperse large size carbon ball

A large-scale, monodisperse technology, used in the chemical industry, can solve the problems of no way to prepare porous carbon spheres, increase the preparation cost, and complex processes.

Inactive Publication Date: 2012-05-02
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Among the above-mentioned preparation methods of carbon spheres, the first method can prepare micron-sized carbon spheres, but the process is more complicated; and the latter three will use various catalysts, which not only complicates the synthesis process, but also increases the preparation cost. Moreover, the prepared carbon spheres have more or less catalyst residues, which leads to the need to purify the carbon spheres in some applications.
[0008] It is not difficult to find that the existing methods can prepare porous carbon spheres below 10mm, and can also prepare porous carbon spheres larger than hundreds of microns, but there is almost no way to prepare porous carbon spheres with a diameter of 10~100mm, and the size is in this range. The carbon spheres between them can be well applied to electrode materials, and currently there are such products abroad that are sold domestically

Method used

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  • Preparation method of monodisperse large size carbon ball
  • Preparation method of monodisperse large size carbon ball

Examples

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Effect test

example 1

[0022] The model of the external pressure SPG membrane emulsifier is MG-20, and the specification of the SPG membrane is Φ10×L20mm. Add 8g of liquid urea-formaldehyde resin as a carbon source into the oil tank of the SPG emulsifier. The liquid urea-formaldehyde resin used must meet the following two conditions: (1) The viscosity at room temperature is between 150 and 1200cps, and the pressure is 0.2-0.5 MPa It can be extruded from the hole of the glass membrane of the emulsifier smoothly; (2) The resin can be further cross-linked and solidified. The concentration of sodium dodecyl sulfonate in the water phase is 0.5wt%, the concentration of ammonium chloride is 0.2mol / L, and the concentration of PVA is 0.1wt%; Adjust the nitrogen valve to make the pressure in the oil phase reach 0.20MPa. Under the action of pressure, the hydrophobic liquid urea-formaldehyde resin is pressed into the water phase through the pores of the glass membrane to obtain oil droplets of uniform size; at ...

example 2

[0024] The model of the external pressure SPG membrane emulsifier is MG-20, and the specification of the SPG membrane is Φ10×L20mm. In the oil tank of SPG emulsifier, add 8g liquid urea-formaldehyde resin as carbon source, the condition that liquid urea-formaldehyde resin used needs to satisfy is the same as example 1. The concentration of AEO-9 in the water phase is 0.3wt%, the concentration of ammonium chloride is 0.1mol / L, and the concentration of PVA is 0.5wt%; adjust the nitrogen valve to make the pressure in the oil phase reach 0.40MPa, under the action of pressure , the hydrophobic liquid urea-formaldehyde resin is pressed into the water phase through the pores of the glass membrane to obtain oil droplets of uniform size; at the same time, the ammonium chloride in the water phase makes the liquid urea-formaldehyde resin solidify slowly, and the urea-formaldehyde resin can be obtained after separation and drying. Balls; put urea-formaldehyde resin microspheres in a muffl...

example 3

[0026] The model of the external pressure SPG membrane emulsifier is MG-20, and the specification of the SPG membrane is Φ20×L20mm. In the oil tank of SPG emulsifier, add 8g liquid urea-formaldehyde resin as carbon source, the condition that liquid urea-formaldehyde resin used needs to satisfy is the same as example 1. The concentration of Tween-80 in the water phase is 0.4wt%, the concentration of ammonium chloride is 0.1mol / L, and the concentration of PVA is 0.25wt%; adjust the nitrogen valve to make the pressure in the oil phase reach 0.25MPa, under the action of pressure , the hydrophobic liquid urea-formaldehyde resin is pressed into the water phase through the pores of the glass membrane to obtain oil droplets of uniform size; at the same time, the ammonium chloride in the water phase makes the liquid urea-formaldehyde resin solidify slowly, and the urea-formaldehyde resin can be obtained after separation and drying. Balls; put urea-formaldehyde resin microspheres in a m...

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Abstract

The invention belongs to the field of chemical industry and specifically relates to a preparation method of monodisperse large size carbon ball. The invention takes liquid urea resin as precursor material, prepares stable micron urea resin emulsion with uniform size by glass membrane emulsification method, conducting emulsification at room temperature, pressure of disperse phase being 0.2-0.5 MPa, concentration of emulsifier in aqueous phase being 0.1-1.0wt%, concentration of ammonium chloride being 0.05-0.5mol/L, and concentration of PVA being 0.1-0.5wt%; after emulsification, stirring 2 hours, curing urea resin under catalysis of ammonium chloride completely, precipitating cured urea resin from aqueous phase; separating settled resin particles, drying and carbonizing at high temperaturein argon gas. The sizes of the carbon balls prepared by the invention are uniform, and the grain diameter of the carbon ball is adjustable within 10-80mm by changing aperture of SPG membrane or pressure of disperse phase during the emulsification. The invention has simple technique and low cost.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method for preparing micron-scale porous monodisperse large-size carbon spheres with high specific surface area and uniform size. The porous carbon spheres can be applied to the fields of adsorption, catalysis, electrode materials and the like. Background technique [0002] Porous carbon materials have been paid close attention to due to their wide application value in gas separation, water purification, catalysis, chromatographic analysis, energy storage, etc. At present, the synthesis methods of spherical carbon materials include chemical vapor deposition, plasma deposition, catalytic pyrolysis and arc method. [0003] Chinese patent CN200510047804.8 discloses a method for preparing pyrolytic carbon spheres. The carbon source liquid is injected into the reactor. Under the action of the gas flow, the carbon source liquid is volatilized and brought to the constant ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02
Inventor 刘清泉
Owner HUNAN UNIV OF SCI & TECH
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