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A method for the efficient and continuous preparation of carbon nanotubes in a coupled fluidized bed

A carbon nanotube and fluidized bed technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of long operating time of carbon nanotubes, broken catalyst particles, low efficiency, etc., to avoid the concentration of reactants Effects of uneven distribution, avoiding temperature distribution, and saving operating time

Active Publication Date: 2019-05-03
WEIFANG HAOSHENG CARBON MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the amount of catalyst required for the preparation of each batch of carbon nanotubes is small, and the reduction and activation conditions are special, and it needs to be carried out in another separate reactor. The process is cumbersome and complicated, and it cannot achieve continuous preparation in the true sense.
In addition, the process of transferring the reduced and activated catalyst to the carbonization reactor will easily cause the catalyst particles to be broken, thus changing the growth morphology and speed of carbon tubes.
The operation time of each batch of carbon nanotube production is long, and the efficiency of the entire reaction device is not high
At the same time, the fluidized bed reactor cannot achieve high-yield production of carbon nanotubes due to the temperature distribution characteristics and the endothermic characteristics of the pyrolysis reaction of hydrocarbon gases.

Method used

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  • A method for the efficient and continuous preparation of carbon nanotubes in a coupled fluidized bed
  • A method for the efficient and continuous preparation of carbon nanotubes in a coupled fluidized bed
  • A method for the efficient and continuous preparation of carbon nanotubes in a coupled fluidized bed

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Embodiment 1

[0020] This embodiment provides an efficient and continuous preparation method for carbon nanotubes in a coupled fluidized bed, the process is as follows figure 1 As shown, the specific steps are as follows:

[0021] The catalyst 1 is continuously and uniformly sent to the catalyst reduction and activation reactor 102 made of a metal material with good thermal conductivity through the screw conveying method 101. The temperature of the catalyst reduction and activation reactor 102 is controlled between 350 and 650 °C. Put the mixed gas 2 of hydrogen and nitrogen or argon into the catalyst reduction and activation reactor 102, the volume ratio of hydrogen and nitrogen or argon in the mixed gas is 1:0.5-2.0, and keep the reduction and activation reaction space velocity at 1-15h -1 , The gas linear velocity is 0.05-2.0m / s.

[0022] At the bottom side of the catalyst reduction and activation reactor 102, there is a pneumatically opened plate type sealing valve 103, which is period...

Embodiment 2

[0026] This embodiment provides an efficient and continuous preparation method for carbon nanotubes in a coupled fluidized bed, the process is as follows figure 2 As shown, the specific steps are as follows:

[0027] The method consists of two parts: catalyst reduction activation and carbonization reaction, wherein the catalyst reduction activation reactor 101 is a conventional fluidized bed reactor, and the upper part 1011 of the catalyst reduction activation reactor 101 is made of a metal material with good thermal conductivity, and the lower half Section 1012 is made of stainless steel powder sintered material capable of filtering. The fluidized bed carbonization reactor 104 is composed of three parts, including a top settling section 1041 , a middle circulation fluidized bed reactor 1042 , and a lower fluidized bed collector 1043 . The catalyst reduction and activation reactor 101 is placed in the carbon nanotube reactor 104 , specifically in the top settling section 104...

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Abstract

The invention relates to the technical field of preparation of materials, and in particular relates to an efficient continuous preparation method of coupled fluidized bed carbon nanotubes. The preparation method comprises the following steps: putting a catalyst reductive activation reactor into a carbon nanotube reactor; finishing reductive activation of the catalyst by means of waste heat of pyrolysis gases generated in a growth process of the carbon nanotubes; then continuously introducing the catalyst into a fluidized bed carbonation reactor, performing a growth reaction of the carbon nanotubes in an intermediate circulation fluidized bed reactor with a circulation; collecting prepared carbon nanotube aggregate larger particles by a lower fluidized bed collector; afterwards, continuously and uniformly moving the collected carbon nanotubes out of the fluidized bed carbonation reactor, thus obtaining a product. According to the efficient continuous preparation method disclosed by the invention, the reductive activation of the catalyst is coupled with carbonation reaction, and the reductive activation of the catalyst is finished in a carbonation process, so that the operation time is saved, the efficiency of the whole reaction device is improved, and breakage of the catalyst due to a pulse air-jet mode is avoided.

Description

technical field [0001] The invention relates to the technical field of material preparation, in particular to an efficient and continuous preparation method of coupled fluidized bed carbon nanotubes. Background technique [0002] Carbon nanotubes are considered to be a new type of functional material and structural material with excellent performance, and have become a research hotspot in the past two decades. So far, there have been many methods for preparing carbon nanotubes, but there are only three main methods, namely arc method, laser ablation method and vapor phase chemical deposition method. The vapor phase chemical deposition method uses nano-scale iron, silver, etc. as catalysts, low-carbon hydrocarbons, carbon oxides or carbon monoxide as raw material gas, and a catalytic cracking reaction at high temperature to grow carbon nanotubes. The carbon nanotubes produced by this method have high purity, controllable specifications, and are easy to scale up industrially,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/164
CPCY02P20/129
Inventor 高岩徐新生
Owner WEIFANG HAOSHENG CARBON MATERIAL