Method for preparing white carbon black by gas phase method and used equipment thereof

Abstract

The invention provides equipment for preparing white carbon black by a gas phase method and a method for preparing the white carbon black by using the equipment. The equipment successively comprises a raw material preheater, a raw material mixer, an injecting device and a high temperature hydrolysis furnace, and is characterized in that the part between the injecting device and the high temperature hydrolysis furnace are connected and sealed by a seal connecting piece, and the injecting device is arranged between the raw material mixer and the high temperature hydrolysis furnace.In the high temperature hydrolysis furnace of the invention, the seal combustion technology, the water cooling jacket type cooling technology, the unique deacidification technology and the advanced filtering technology are utilized, so that the obtained white carbon black has small fluctuation on the special surface area, the production efficiency is improved and the energy is saved greatly.

Description

technical field [0001] The invention belongs to the technical field of inorganic fine chemicals, and in particular relates to a method for preparing fumed white carbon black and equipment used therefor. Background technique [0002] Fumed silica was first developed in 1941 by Germany's Digosha Company. At present, only a few countries in the world, such as Germany, the United States, Japan, Ukraine, and the Middle East, have mastered the industrial production technology of fumed silica. Most of the fumed silica production processes currently used are to mix the vaporized siloxane with hydrogen and air first, and then mix it in a high-temperature hydrolysis furnace (also called a reaction furnace or a combustion furnace, etc.) under open conditions. The reaction produces gas-phase white carbon black and hydrogen chloride, which are finally separated to obtain the finished product. This method adopts an open method for combustion and hydrolysis, and the air supplemented by th...

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Problems solved by technology

This method adopts an open method for combustion and hydrolysis, and the air supplemented by the outside contains impurities and cannot be measured, resulting in large fluctuations in the specific surface area of ​​the finished product, which affects product quality

In addition, in terms of cooling the high-temperature hydrolysis furnace, most of the existing technologies use high-power Roots blowers, which consume a lot of energy, and it is difficult to comprehensively utilize the heat energy after heat exchange, and the cooling capacity is small, which affects the production capacity of a single set of equipment

[0003] The main problems in the white carbon black production process in the prior art are: (1) raw materials are burned and hydrolyzed under the open condition in the high-temperature hydrolysis furnace, so that the specific surface area of ​​white carbon black fluctuates greatly, and the quality is unstable; (2) high temperature The heat of reaction in the hydrolysis furnace cannot be taken away in time, which affects the production capacity of a single set of equipment and the heat energy is not fully utilized; (3) The technology of gas-solid separation is not mature enough, and the tail gas contains a large amount of white carbon black, which is easy to cause blockage of the tail gas system, resulting in The driving is unstable, and continuous production cannot be performed, which affects product quality and production efficiency; (4) The deacidification capacity is not enough, and the deacidification process is backward. Most of them use electric heating technology, and the deacidification capacity is reduced.

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