Reaction unit and process of continuous preparation of carbon nano-tube

Abstract

The invention discloses a reaction device and process for preparing carbon nanotubes, which are particularly suitable for continuous preparation of single-wall carbon nanotubes or multi-wall carbon nanotubes. The technical solution of the invention is to adopt a reaction device for continuously preparing carbon nanotubes, the reaction device is a tower reactor, and simultaneously provide a process for continuously preparing carbon nanotubes by using the device. The technical scheme of the present invention adopts a reaction device for continuously preparing carbon nanotubes, the reaction device is a tower reactor, and the tower reactor is composed of a catalyst container, a catalyst quantitative tank, a reaction tower, a crude product outlet, a tail gas outlet, and a feed gas inlet. It consists of six parts, and there are horizontally arranged trays in the reaction tower. In the tower reactor provided by the present invention, the catalyst can reach the reaction zone at the fastest speed and leave the reaction zone at the fastest speed, the movement of the catalyst is completed under the action of mechanical force, and the raw material gas flow rate can be very low, so the energy consumption is low , Raw material gas conversion rate is high.

Description

technical field [0001] The invention relates to a reaction device and process for preparing carbon nanotubes, which are particularly suitable for continuous preparation of single-wall carbon nanotubes or multi-wall carbon nanotubes. Background technique [0002] 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 catalytic cracking method. The arc method is the earliest method for preparing carbon nanotubes, and it is still the current method for preparing carbon nanotubes with high crystallinity. Laser ablation is currently the main method for preparing single-walled carbon nanotubes, but the yield is at the milligram level, which is difficult to scale up industrially. The catalytic cracking method uses nano-scale iron, cobalt or nickel as a catalyst, and low-carbon hydrocarbons, carbon oxides or carbon monoxide as a raw material gas, and a catalytic cracking reaction occur...

AI Technical Summary

Problems solved by technology

[0003] There are four kinds of processes in the catalytic cracking method, namely fixed bed process, ebullated bed process, floating bed process and moving bed process. Each process has its own advantages and disadvantages. For example, the fixed bed process has simple equipment and flexible and convenient operation. The ability to process catalysts is small, and it is only suitable for the screening of catalysts or the preparation of a small amount of carbon nanotubes; the ebullated bed process can process a large amount of catalysts, and can also obtain a good yield of carbon nanotubes, but the conversion rate of raw gas is low, and the energy consumption is high. The operation is difficult; the floating bed process has great limitations, and is only suitable for ferrocene, carbonyl iron and other catalyst systems that are easy to gasify and decompose; the moving bed process has obvious advantages in the preparation of multi-walled carbon nanotubes with design specifications. Advantages, but due to the problems of temperature gradient and moving speed, it is not suitable for continuous preparation of single-walled carbon nanotubes

Images