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Purification method of carbon nano pipe and its device

A technology of carbon nanotubes and purification methods, applied in chemical instruments and methods, chemical/physical processes, etc., can solve the problems of not too thick material layer, limited processing capacity, high energy consumption, etc., to achieve large processing capacity and good purification effect , The effect of high heat transfer/mass transfer coefficient

Inactive Publication Date: 2004-02-18
TSINGHUA UNIV
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Problems solved by technology

Due to the heat release during the oxidation process, if the generated heat cannot be removed in time, it will cause local overoxidation. Therefore, the material layer in the fixed bed should not be too thick, which seriously limits the processing capacity.
Reported in "Jeong-Mi Moon, Kay Hyeok An, Young Hee Lee, et al., High-yield purification process of singlewalled carbon nanotubes, J.Phys.Chem.B, 2001, 105:5677-5681", Jeong-Mi Moon et al. placed the sample in a horizontal quartz tube, and continuously rotated the quartz tube during the oxidation process to cause the solid material to turn over, thereby enhancing heat transfer. However, this method requires continuous rotation of the reactor, so energy consumption is high

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  • Purification method of carbon nano pipe and its device
  • Purification method of carbon nano pipe and its device

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Embodiment Construction

[0011] The invention relates to a method for purifying carbon nanotubes and a device thereof. The structure of its purification device is as follows figure 1 Schematic diagram of the structure of the nano-agglomerated fluidized bed reactor shown. A gas distributor 1 is installed at the bottom of the reactor bed 4, a heating / cooler jacket 2 is set outside the reactor bed 4, a gas-solid separator 5 is installed on the top of the reactor bed 4, and a charging port 6 and the discharge port 7 are installed on the upper and lower sides of the reactor bed 4 respectively.

[0012] The purification method of the above-mentioned carbon nanotubes is to use the impact force of the oxidizing gas and the fluidization gas introduced from the bottom of the nano-agglomeration fluidized bed reactor to stir the solid material 3 in the reactor to make it fully fluidized and selected. Sexual oxidation reaction, the amorphous carbon in the carbon nanotube crude product and the carbon layer coated...

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Abstract

An equipment for purifying the carbon nanotubes is a nano aggregating fluidized-bed reactor composed of gas distributor, fluidized bed, gas-solid separator, feeding inlet and discharging outlet. Its process features that the oxidizing gas and fluidized gas are introduced to said reactor from its bottom to make the solid material in fluidized state, and the raw carbon nanotubes are fluidized and selectively oxidized to remove the amorphous carbon and the carbon coated on the surface of catalyst.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, in particular to a method for purifying carbon nanotubes and a device thereof for removing carbon phase impurities by gas-phase selective oxidation. Background technique [0002] A carbon nanotube is a tubular nanomaterial composed of carbon atoms. Tube walls containing multiple layers of carbon atoms are called multi-walled carbon nanotubes (MWNTs), and those containing a single layer of carbon atoms are called single-walled carbon nanotubes (SWNTs). Carbon nanotubes have attracted the attention of researchers for their unique structure and excellent performance since they were discovered, and have potential application prospects in new conductive / high-strength composite materials, electronic devices, and catalyst support materials. Compared with MWNT, SWNT has a more perfect structure and better performance, so the preparation and application technology of SWNT has become the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J8/24C01B31/02
Inventor 王垚魏飞刘毅
Owner TSINGHUA UNIV
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