Production system for producing fumed silica by utilizing silicon tetrachloride

Abstract

The invention discloses a production system for producing fumed silica by utilizing silicon tetrachloride. According to a reaction process, the production system comprises a reaction furnace, an aggregation device, a separation device, a deacidification device and an exhaust gas recovery device which are sequentially arranged. The production system is characterized in that the exhaust gas recovery device comprises five levels of absorption towers which are connected in series; an absorption liquid tank is matched with the liquid-phase outlet of each level of the absorption tower; the outlets of the absorption liquid tanks matched with the second-level, third-level and fourth-level absorption towers are respectively communicated with the absorption liquid inlets of the corresponding previous-level absorption towers. The production system has the advantages that the equipment layout is reasonable, the exhaust gas recovery effect is good, the blockage possibility of a production pipeline is low, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to a production device in the field of fine chemical industry, in particular to a system for producing fumed white carbon black by using silicon tetrachloride. Background technique [0002] Fumed silica, also known as fumed silica, is one of the extremely important nano-scale inorganic raw materials. Fumed silica has small particle size, large specific surface area, strong surface adsorption, large surface energy, high chemical purity, good dispersion performance, excellent stability, reinforcement, thickening and thixotropy, and is widely used in many subject areas. [0003] Fumed white carbon black is a nano-scale white powder produced by high-temperature hydrolysis of silane halides (mainly silicon tetrachloride and methyltrichlorosilane) in a hydrogen-oxygen flame, and then further passed through the flocculation of the aggregation device and the solidification of the separation device. Gas separation and deacidification in ...

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Problems solved by technology

Each absorption tower is equipped with an acid circulation tank. The absorption liquid discharged from the absorption tower is pumped back into the respective absorption towers through the circulation pump to be used as the absorption liquid. As the concentration of the absorption liquid continues to increase, the absorption effect of the absorption liquid on the tail gas It is getting worse and worse; at the same time, the absorption liquid is recycled in a single absorption tower, the temperature of the absorption liquid tends to become higher, the temperature of the absorption liquid becomes higher, and the absorption effect on hydrogen chloride decreases

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