Anhydrous hydrogen fluoride preparation process

Abstract

The invention relates to the technical field of fluorine chemicals and in particular relates to an anhydrous hydrogen fluoride preparation process. The process is characterized by comprising the following steps: circulating fluidized bed reaction, granular moving bed filtration, washing and condensing, circulating fluidized bed distillation, circulating fluidized bed degassing and environmental-friendly tail gas treatment.

Description

technical field [0001] The invention relates to the technical field of fluorine chemical industry, in particular to a preparation process of anhydrous hydrogen fluoride. Background technique [0002] Anhydrous hydrogen fluoride has been widely used in electronics, chemical industry, petroleum and other industries. It is mainly used for the preparation of fluorine salts, fluorohaloalkanes, fluorine refrigerants, corrosion of glass, impregnation of wood, and electrolysis of elemental fluorine. Chinese invention patent (patent number CN201310287202.4, patent name is a production method of anhydrous hydrogen fluoride) discloses a production method of anhydrous hydrogen fluoride, which is characterized in that it includes the following steps: feeding fluorite powder and sulfuric acid into the pre-reactor ; In the pre-reactor, sulfuric acid and fluorite powder are fully mixed and reacted at the same time to generate crude hydrogen fluoride gas; the crude hydrogen fluoride gas is r...

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Problems solved by technology

[0003] Prior art 1 and prior art 2 hydrofluoric acid reaction devices are currently commonly used rotary reactors, and their disadvantages are: the fluorite produced by the reaction covers the fluorite on the one hand and hinders the reaction from continuing, and on the other hand adheres to the rotary reaction furnace. On the inner wall of the furnace, the lining of the rotary reactor drum is corroded, which shortens the maintenance cycle of the device, and at the same time causes fouling on the inner wall of the rotary reactor, which reduces the heat transfer efficiency of the rotary furnace

Hydrogen fluoride separation and impurity refining devices are currently commonly used pre-purification towers, scrubbers, condensers, rectification towers and degassing towers. Among them, washing and condensation are usually one of the processes for refining anhydrous hydrogen fluoride. The existing technical problems mainly include washing The washing acid from the bottom of the tower enters the washing circulation storage tank. The washing acid pipeline is generally inserted into the washing circulation storage tank below the liquid level of 800mm. The gas pipe that transports hydrofluoric acid gas is blocked and flows back to the reaction furnace, causing corrosion to the reaction furnace body

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