Method and device for continuously preparing high-purity carbon nano tubes

A carbon nanotube, high-purity technology, applied in the fields of carbon nanotubes, chemical instruments and methods, nanocarbons, etc., can solve the problems of continuous production resistivity increase, inability to continuous production, large amounts of sewage, etc., to ensure purification. effect, low operating cost and stable product quality

Active Publication Date: 2018-12-07
SHANDONG DAZHAN NANO MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current carbon nanotube purification methods include pickling purification, chlorine gas purification, high-temperature purification, etc. Currently, the cost of pickling is relatively low, but the purification process produces a large amount of sewage, and the highest purity is only 99.8%; high-temperature graphitization can reach metal iron less than The purification level of 100ppm, but the energy consumption is too large, the production capacity is small, the continuous production is not possible, and the cost is high; in terms of chlorine gas purification, the existing technology is difficult to solve the problems of continuous production, high purity and high resistivity

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  • Method and device for continuously preparing high-purity carbon nano tubes

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Comparison scheme
Effect test

Embodiment 1

[0034] Example 1 A method for continuously preparing high-purity carbon nanotubes

[0035] Specific steps are as follows:

[0036] (1) The carbon nanotubes are replaced by inert gas first, and then pass through the quantitative feeding device and pass through the positive pressure dense phase conveying device. Driven by the mixed gas of protective carrier gas and acid gas, they enter the gradient heating at room temperature in the form of dense phase flow. device;

[0037] The inert gas is argon, the argon flow rate is 4L / min, and the carbon nanotubes are iron-based multi-walled carbon nanotubes with an ash mass concentration of 2.5%; the protective carrier gas is nitrogen, and the acid gas is chlorine; the carbon nanotubes The feed rate is 100g / min, the flow of nitrogen is 4 L / min, the flow of chlorine is 4L / min; the mixed gas pressure in the positive pressure dense phase delivery device is 1.5Mpa;

[0038] (2) The carbon nanotubes are preheated and reacted in the quartz coil...

Embodiment 2

[0043] Example 2 A method for continuous preparation of high-purity carbon nanotubes

[0044] Specific steps are as follows:

[0045] (1) The carbon nanotubes are replaced by inert gas first, and then pass through the quantitative feeding device and pass through the positive pressure dense phase conveying device. Driven by the mixed gas of protective carrier gas and acid gas, they enter the gradient heating at room temperature in the form of dense phase flow. device;

[0046] The inert gas is helium, the helium flow rate is 4L / min, and the carbon nanotubes are cobalt-based multi-walled carbon nanotubes with an ash mass concentration of 2%; the protective carrier gas is nitrogen, and the acid gas is chlorine; the carbon nanotubes The feed rate is 100g / min, the flow of nitrogen is 4 L / min, the flow of chlorine is 4L / min; the mixed gas pressure in the positive pressure dense phase conveying device is 3Mpa;

[0047] (2) The carbon nanotubes are preheated and reacted in the quart...

Embodiment 3

[0052] Example 3 A device for continuous preparation of high-purity carbon nanotubes

[0053] Such as figure 1 As shown, the device for continuously preparing high-purity carbon nanotubes includes a gas replacement device 1, a gradient heating device 2, a gas-solid separation device 3 and a tail gas treatment device 4;

[0054] The gas replacement device 1 includes a CNT storage tank 101. The top of the CNT storage tank 1 is provided with a replacement filter blowback device 102. The replacement filter blowback device 102 is connected to a vacuum pump 104 through a vacuum shut-off valve 103. The bottom of the CNT storage tank 101 is provided with nitrogen gas. Air inlet pipe 105, nitrogen inlet pipe 105 is provided with inlet valve 106, the bottom opening of CNT storage tank 101 is provided with quantitative feeder 5, quantitative feeder 5 is connected with dense-phase conveying device 6, protective carrier gas pipe 7 The flow controller 9 and the acid gas pipe 8 are all conn...

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Abstract

The invention relates to a method and device for continuously preparing high-purity carbon nano tubes. The method comprises the following steps: (1) performing inert gas replacement on carbon nano tubes, passing through a pressurized seal pneumatic conveying device via a quantitative dumping device, and entering a gradient heating device at a normal temperature in a dense-phase flow form under drive of mixed gases of protective carrier gas and acid gas; (2) preheating and reacting the carbon nano tubes in the gradient heating device; (3) separating the purified carbon nano tubes from tail gases by virtue of a two-stage gas-solid separation device, cooling the carbon nano tubes by a cooling device in the gas-solid separation device, and enabling the carbon nano tubes to enter a high-puritycarbon nano tube collection device via a feeding hole; and (4) enabling the tail gases to enter a tail gas treatment device, feeding the protective gas to a protective gas inlet via a recycling pressure stabilizing device; and feeding impurity tail gases into a tail gas collection device. According to the method disclosed by the invention, the carbon nano tubes with the high purity of 99.9% or higher can be obtained, and the device disclosed by the invention is simple in operation, simple and stable in process, low in operating cost and stable in product quality.

Description

technical field [0001] The invention relates to a method and device for continuously preparing high-purity carbon nanotubes, belonging to the field of carbon nanotube purification. Background technique [0002] As a one-dimensional nanomaterial, carbon nanotubes have excellent physical and mechanical properties. They are mainly coaxial circular tubes with several to dozens of layers of carbon atoms arranged in a hexagonal shape. It has a very large aspect ratio, the diameter is usually between 1-100nm, and the length is several microns to hundreds of microns. It is precisely because of its large aspect ratio that carbon nanotubes perform very well in terms of mechanics, electricity, and electrical and thermal conductivity. Due to its excellent properties, carbon nanotubes have broad and potential application prospects in many fields such as catalyst supports, rubber-plastic composite materials, electrochemical materials, and photoelectric sensing. [0003] At present, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/17
CPCC01B32/17C01B2202/30
Inventor 李岩耿磊吕振华李龙利蒋兴华王莲莲王哲鞠坤刘滨张爱萍周勇
Owner SHANDONG DAZHAN NANO MATERIALS
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