Use method of circulating fluidized bed rectification device for preparing hydrogen fluoride

Abstract

The invention relates to the technical field of fluorine chemical engineering and specifically relates to a use method of a circulating fluidized bed rectification device for preparing hydrogen fluoride. The use method is characterized by comprising the steps that a coarse hydrofluoric acid solution enters from a liquid material guiding pipe which is arranged in the middle of a circulating fluidized bed rectification tower, the coarse hydrofluoric acid solution is injected into a liquid receiving disk, the coarse hydrofluoric acid solution is evenly distributed by the liquid receiving disk anddrops into a reboiler, the coarse hydrofluoric acid solution is gasified to form rising steam when flowing downwards to various stages of fin plates, the coarse hydrofluoric acid solution passes through the liquid receiving disk to enter a multistage cyclone condenser, liquid drops carried by the rising steam can be cyclone separated to form a continuous liquid film on a barrel body wall of the multistage cyclone condenser, in this case, the content of a volatile component hydrogen fluoride in the rising steam is continuously improved, the purity of the hydrogen fluoride liquid condensed by the multistage cyclone condenser is continuously improved, and the hydrogen fluoride liquid is drained out from the bottom.

Description

technical field [0001] The invention relates to the technical field of fluorine chemical industry, in particular to a method for using a circulating fluidized bed rectification device for preparing hydrogen fluoride. Background technique [0002] Hydrogen fluoride has been widely used in electronics, chemical industry, petroleum and other industries. It is mainly used to produce fluorine salts, fluorohaloalkanes, fluorine refrigerants, corrode glass, impregnate wood, and electrolyze elemental fluorine. Its rectification device is used to produce anhydrous One of the key equipment of hydrogen fluoride. Chinese invention patent (patent number CN 201020651387.4, patent name is an anhydrous hydrogen fluoride rectification tower) discloses an anhydrous hydrogen fluoride rectification tower, which is characterized in that it includes a tower body, a tower kettle and a reboiler. The kettle is arranged at the bottom of the tower body and directly communicates with the interior of t...

AI Technical Summary

Problems solved by technology

[0003] The technical solutions proposed by prior art 1 and prior art 2 are rectification towers. The current rectification towers are generally plate towers or packed towers using structured packing. Packed towers are selected as rectification process devices, which are suitable for fast and instantaneous reactions. The process has the advantages of high specific surface area, high gas film mass transfer coefficient, and reduced gas phase flow pressure. The disadvantage is that the liquid storage volume is small and the liquid stays in the packed tower for a short time; the plate tower is selected as the rectification process device, which is suitable for In the fast and medium speed reaction process, it has the advantages of small liquid backmixing, uniform residence time, and large liquid film mass transfer coefficient. The disadvantages are complex structure, large gas phase pressure drop, and low corrosion resistance of the tower internals.

In summary, due to the limitation of the liquid storage capacity of the packed tower and the plate tower, the processing capacity is small, the mass transfer efficiency is low, the pressure drop is large, and the operating flexibility is small

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