Preparation method and application of phosphorus pentafluoride

Abstract

The invention relates to the technical field of fluorine chemical industry, in particular to a preparation method and application of phosphorus pentafluoride. The invention provides a preparation method of phosphorus pentafluoride, which comprises the following steps: 1) adding phosphorus pentoxide into anhydrous hydrogen fluoride, adding sulfur trioxide into a reaction system after the phosphorus pentoxide is completely added, and heating for reaction to obtain mixed gas containing phosphorus pentafluoride; and 2) condensing the mixed gas containing the phosphorus pentafluoride to obtain the phosphorus pentafluoride. According to the method, the high-purity phosphorus pentafluoride can be obtained by controlling the adding sequence of the phosphorus pentoxide and the anhydrous hydrogen fluoride and introducing the sulfur trioxide as a raw material through heating reaction and condensation, the content of water and the hydrogen fluoride in the phosphorus pentafluoride is remarkably reduced, and meanwhile, the conversion rate of the phosphorus pentoxide can reach 100%.

Description

A kind of preparation method of phosphorus pentafluoride and use thereof technical field The present invention relates to fluorine chemical technical field, be specifically related to a kind of preparation method and purposes of phosphorus pentafluoride. Background technique Phosphorus pentafluoride is a kind of colorless gas, and melting point and boiling point are respectively -94 ℃ and -84 ℃ under normal pressure, industrially as A fluorination reagent is used in the fields of electronic industry and polymer material manufacturing, and can be used as a catalytic fluorination agent in the field of organic synthesis. In recent years, with the increasing popularity and promotion of high-performance mobile electronic products, the requirements for high-performance secondary batteries are becoming more and more The higher the future, the lithium ion secondary battery with lithium hexafluorophosphate as the electrolyte has been widely used due to its many advantages. Ph...

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Problems solved by technology

[0005] Therefore, the technical problem to be solved in the present invention is to overcome the defects that the purity of phosphorus pentafluoride obtained when phosphorus pentafluoride is prepared by using the oleum method in the existing phosphorus pentafluoride preparation method is relatively low, and the hydrogen fluoride content is relatively high, and then Provided is a preparation method and application of phosphorus pentafluoride

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