Continuous production method of phosphorus pentafluoride

Abstract

The invention relates to a continuous production method of phosphorus pentafluoride, and belongs to the technical field of preparation of the phosphorus pentafluoride. The invention aims to provide the continuous production method of the phosphorus pentafluoride. According to the continuous production method, under the protection of an inert gas, liquid yellow phosphorus is atomized and sprayed according to a spraying method, and the sprayed phosphorus spray reacts with fluorine-containing gas through reverse contact to obtain the phosphorus pentafluoride, wherein the fluorine-containing gas is gas containing fluorine gas. According to the continuous production method, through continuous spraying of the phosphorus spray and reaction of the phosphorus spray and the fluorine gas, the phosphorus pentafluoride can be continuously prepared; the conventional gas-solid reaction of the fluorine gas and the phosphorus is changed into an gas-gas reaction, and the reaction thereof is easy to control; through control of the gas flow, the speed rate can be controlled to achieve the purpose of controlling reaction heat, so that the whole reaction process is stable, an explosion accident causedby violent reaction is avoided and safety risks are reduced.

Description

technical field [0001] The invention relates to a continuous production method of phosphorus pentafluoride, belonging to the technical field of phosphorus pentafluoride preparation. Background technique [0002] Phosphorus pentafluoride is an important inorganic fluoride, which can be used in the electronics industry, polymer materials and organic synthesis catalysts. In recent years, with the development of lithium batteries, phosphorus pentafluoride is an important raw material for the production of lithium hexafluorophosphate electrolyte materials for lithium batteries, and its demand and quality requirements are also increasing. Therefore, large-scale continuous production of phosphorus pentafluoride is of great significance . [0003] At present, there are two main processes for industrialized production of high-purity phosphorus pentafluoride, one is to use phosphorus pentachloride to react with hydrogen fluoride to generate phosphorus pentafluoride and hydrogen chlor...

AI Technical Summary

Problems solved by technology

Since this method uses solid phosphorus as a raw material, and solid yellow phosphorus is particles with different surface areas, the contact area between yellow phosphorus and fluorine gas fed into the reactor at different times cannot be kept consistent, resulting in large fluctuations in the reaction rate, which is not conducive to Stable and accurate control of the reaction rate. Since the reaction between yellow phosphorus and fluorine gas will release a large amount of heat, when the reaction rate fluctuates greatly, it is easy to cause an explosion accident due to a reaction out of control, and the safety risk is greater

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