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

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 ...

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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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