Synthesis method and device for gas phase white carbon black

Abstract

The invention relates to a synthesis method and a synthesis device for a gas phase white carbon black. The synthesis device for the gas phase white carbon black consists of a combustion furnace, a lithium bromide set and a freezing hydrochloric acid circulation system. The combustion furnace is connected with the lithium bromide set through a return pipe and a water pipe; the upper part of the other end of the lithium bromide set is connected with the freezing hydrochloric acid circulation system through a return pipe and a water pipe. The silicon halide, air and hydrogen after preheating is continuously input to the sealed combustion furnace for pyrohydrolysis, so gas and solid mixture of the white carbon black is obtained, and the generated heat is taken away by a water cooling jacket of the combustion furnace. Compared with the prior art, the invention provides a single set of 4,000T / a gas phase white carbon black synthesis technology, and adopts seal combustion technology, water cooling jacket cooling technology, deacidification technology and filtering technology to improve the production capacity. The production device can perform long-period production, the heat energy is fully used, and the consumption is reduced. The product quality is very stable, and the difference from overseas products is greatly shortened.

Description

technical field [0001] The invention relates to a synthesis method and device of carbon black, in particular to a synthesis method and device of fumed white carbon black. Background technique [0002] Fumed silica was first developed in 1941 by Germany Digosha Company. At present, only a few countries in the world, such as Germany, the United States, Japan, and the Middle East, have mastered the industrial production technology of fumed silica. The production process of fumed silica is basically Similarly, the gasified halosilane is mixed with hydrogen and air first, reacted in a synthesis furnace and then separated to obtain a finished product. Usually, monomethyltrichlorosilane and silicon tetrachloride are used as raw materials for production. Many domestic and foreign manufacturers Most of them use the open method to burn and hydrolyze, and the air supplemented by the outside cannot be measured, resulting in large fluctuations in the specific surface area of ​​the finish...

AI Technical Summary

Problems solved by technology

[0002] Fumed silica was first developed in 1941 by Germany Digosha Company. At present, only a few countries in the world, such as Germany, the United States, Japan, and the Middle East, have mastered the industrial production technology of fumed silica. The production process of fumed silica is basically Similarly, the gasified halosilane is mixed with hydrogen and air first, reacted in a synthesis furnace and then separated to obtain a finished product. Usually, monomethyltrichlorosilane and silicon tetrachloride are used as raw materials for production. Many domestic and foreign manufacturers Most of them use the open method to burn and hydrolyze, and the air supplemented by the outside cannot be measured, resulting in large fluctuations in the specific surface area of ​​the finished product, which affects product quality, and the cooling of the reactor mostly uses a high-power Roots blower, which consumes a lot of energy. It is difficult to comprehensively utilize heat energy, and the cooling capacity is small, which affects the production capacity of a single device

[0003] At present, the maximum capacity of a single set of production equipment of domestic manufacturers is only 1000T / a, and the restrictive factors are as follows: (1) The reaction heat in the combustion furnace cannot be taken away in time, (2) The reaction furnace is exposed to combustion and hydrolysis, resulting in the loss of white carbon black The specific surface area fluctuates greatly and the quality is unstable

(3) The gas-solid separation technology is not mature enough, and the tail gas contains a large amount of white carbon black to block the tail gas system, resulting in unstable driving and continuous production, which affects product quality

(4) The deacidification ability is not enough, the deacidification process is backward, most of them adopt electric heating technology, and the deacidification ability is reduced

The capacity of a single set of production equipment of foreign manufacturers is about 4000T / a. Due to foreign technology blockade and sky-high technology transfer fees, many domestic manufacturers are relatively backward in technology, high in production costs, and have a certain gap in product quality.

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