A kind of using method of preparing hydrogen fluoride circulating fluidized bed degassing device

Abstract

The invention relates to the technical field of fluorine industry, in particular to an application method of a circulating fluidized bed degasser for preparation of hydrogen fluoride. The applicationmethod is characterized in that a hydrogen fluoride liquid with heavy components H2SO4 and H2O removed through rectification enters the device through a feed liquid pipe designed at the central part of a circulating fluidized bed degassing tower and is injected into a liquid receiving tray; when the hydrogen fluoride liquid flows down to a primary fin plate, volatile components SO2, SiF4, CO2 andH2S are vaporized to form rising steam; and the purity of the non-volatile hydrogen fluoride liquid which is condensed by a multi-stage cyclone separation condenser and enriched at the bottom of the tower is continuously increased, thus achieving the purpose of removing light components.

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 degasser 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. The degassing device is used to produce anhydrous One of the key equipment of hydrogen fluoride. Chinese invention patent (patent No. CN 201720751304.0, patent name is a degassing tower for the production of anhydrous hydrogen fluoride) discloses a degassing tower for the production of anhydrous hydrogen fluoride, which is characterized in that it includes a tower body, the Both sides of the bottom of the tower body cavity are connected with support rods, the top of the support rods is c...

AI Technical Summary

Problems solved by technology

[0003] The technical solutions proposed by prior art 1 and prior art 2 are degassing towers. The current degassing towers are generally plate towers or packed towers using structured packing. Packed towers are selected as degassing process devices, which are suitable for rapid 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 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

Images