A kind of mixing device and method of nano-scale gas-phase white carbon black raw material

Abstract

The invention discloses a mixing device and a mixing method for a nano-scale gas-phase-method white carbon black raw material, the device includes a first mixer and a reactor which are connected by a pipeline, a material inlet of the first mixer is connected with an air pipe and a silicon tetrachloride pipe, a second mixer is arranged between the first mixer and the reactor, the device also includes a first hydrogen pipeline system and a second hydrogen pipeline system which are connected with a hydrogen bus, the terminal end of the first hydrogen pipeline system is connected with a gas inlet of the reactor, and the terminal end of the second hydrogen pipeline system is connected between the first mixer and the second mixer. Raw material mixing mode is transferred from two-time mixing to three-time mixing, the raw material can be effectively mixed, and a nano-scale gas-phase-method white carbon black product with good application properties can be produced.

Description

Technical field [0001] The invention relates to the field of preparing nano-scale gas phase white carbon black, in particular to a mixing device and method of nano-scale gas phase white carbon black raw materials. Background technique [0002] In the production of nano-scale gas-phase white carbon black, three raw materials—(heating and vaporization) silicon tetrachloride gas, reaction air and reaction hydrogen must be fully mixed. The more fully mixed the raw materials, the more thorough the high-temperature hydrolysis reaction will proceed. The hydroxyl groups adsorbed on the surface of the produced nano-scale gas phase silica primary particles will be more evenly distributed, and the nano-scale gas phase silica will have more excellent application properties, such as thickening, reinforcement and thixotropy. [0003] The existing nano-scale gas phase method white carbon black raw material mixing technology is the secondary mixing of raw materials, and the mixing degree cannot me...

AI Technical Summary

Problems solved by technology

[0003] The existing nano-scale fumed silica raw material mixing technology is secondary mixing of raw materials, and the degree of mixing cannot meet the production needs of high-quality fumed silica; resulting in insufficient high-temperature hydrolysis reaction, and the resulting nano-scale fumed white The uneven distribution of hydroxyl groups adsorbed on the surface of carbon black primary particles directly affects the application performance of nano-scale fumed silica: thickening, reinforcing and thixotropy, etc.

The main measures currently taken are: 1. Promote the mixing of raw materials by increasing the temperature of the three raw materials; 2. Increase the length of the material pipe between the first mixer and the reactor to increase the mixing degree of raw materials; 3. Change the appearance of the reactor Moderately enlarge the size, especially increase the size of the upper cavity of the reactor to improve the mixing degree of raw materials. The above technical measures can play some role, but it is impossible to fundamentally improve the mixing degree of raw materials.

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