Synthetic method of hexafluorophosphate

Abstract

The invention discloses a synthesis method of hexafluorophosphate, which belongs to the technical field of chemical synthesis, and is characterized by comprising the following steps: dissolving phosphorus pentahalide in an inert solvent to obtain a phosphorus pentahalide inert solvent solution, dissolving alkali metal halide salt in anhydrous hydrogen fluoride to obtain an alkali metal villiaumite hydrogen fluoride solution, the method comprises the following steps: inputting hexafluorophosphate, hydrogen fluoride, an inert solvent and hydrogen halide into a reactor in proportion for reaction to obtain a mixture consisting of the hexafluorophosphate, the hydrogen fluoride, the inert solvent and the hydrogen halide, firstly removing hydrogen halide gas through gas-liquid separation, then recovering the hydrogen fluoride through heating evaporation, finally recovering the inert solvent through solid-liquid separation, and drying a solid to obtain the hexafluorophosphate, the synthesis method disclosed by the invention has the advantages of simplicity in operation, good safety, high reaction yield, excellent product quality, capability of realizing continuous production and the like.

Description

Technical field [0001] The present invention belongs to the technical field of chemical synthesis, in particular, it relates to a method for the synthesis of hexafluorophosphate. Background technique [0002] Global warming is a major issue facing humanity in the 21st century, not only human development, and even affect the survival of humanity. Solve the global warming problem, the first thing is based on solar, wind and other new clean energy alternative to traditional high pollution and high emissions of fossil fuels and reduce carbon dioxide and other greenhouse gases, therefore, the development of green, environmental protection has become a secondary battery to solve the problem The essential. After half a century of research and industrial development, the current lithium-ion batteries have large-scale production, widely used in energy storage, power and so on, the sodium ion battery into the fast lane, and gradually into the application stage, while potassium ions battery...

AI Technical Summary

Problems solved by technology

[0025] The elemental phosphorus method is to place elemental phosphorus (red phosphorus, yellow phosphorus, white phosphorus, etc.) in a special reactor, introduce fluorine gas, and obtain phosphorus pentafluoride through gas-solid phase reaction. The purity of phosphorus is high, and high-purity phosphorus pentafluoride can be obtained without complicated purification operations. The disadvantage is that fluorine gas needs to be prepared through an additional electrolytic fluorine production process, and the reaction process is a gas-solid phase reaction. The reactor structure It has high requirements on materials and harsh reaction conditions, so it is difficult for large-scale industrial application

[0028] (2) Phosphorus pentafluoride obtained by the reaction of phosphorus pentachloride and hydrogen fluoride is a gas with a low boiling point of only -84.6°C. It is difficult to liquefy, making it difficult to purify, store, transport and use phosphorus pentafluoride, resulting in synthesis Costs rise, production efficiency falls

[0029] (3) The raw materials used in the synthesis of hexafluorophosphate are highly toxic and dangerous, and there are major safety risks in the reaction process. At present, hexafluorophosphate is generally synthesized by batch reaction, which poses serious production safety hazards.

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