Synthetic method for raising reaction efficiency during production process of lithium hexafluorophosphate

Abstract

The invention discloses a synthetic method for raising reaction efficiency during production process of lithium hexafluorophosphate. The method comprises the following steps: 1) gasification of liquid hydrogen fluoride: by heating liquid hydrogen fluoride through a hot water jacket, hydrogen fluoride is gasified to a gaseous state; 2) liquification of gaseous hydrogen fluoride: the above gaseous hydrogen fluoride is conveyed through a delivery pipe into a low temperature condenser to undergo heat-exchange condensation, and then the gaseous hydrogen fluoride is converted to a liquid state; and 3) addition of hydrogen fluoride into a reaction vessel: the above liquid hydrogen fluoride is added drop by drop into a reaction pot filled with phosphorus pentachloride to carry out a reaction. The liquid hydrogen fluoride is added drop by drop at uniform speed, and flow velocity is controlled through a reaction valve. By the synthetic method for raising reaction efficiency in the production process of lithium hexafluorophosphate, production efficiency of lithium hexafluorophosphate, purity of the product is raised, safety of production is enhanced, and environmental pollution is also reduced.

Description

technical field [0001] The invention relates to a synthesis process of lithium hexafluorophosphate, in particular to a synthesis method for improving reaction efficiency in the production process of lithium hexafluorophosphate. Background technique [0002] The current lithium hexafluorophosphate production process mainly uses the following two methods to mix and react materials: 1. React gaseous hydrogen fluoride and phosphorus pentachloride to generate semi-finished phosphorus pentafluoride and then react with lithium fluoride in the solvent to generate lithium hexafluorophosphate; 2. Directly react with liquid hydrogen fluoride and phosphorus pentachloride to generate phosphorus pentafluoride and then react with lithium fluoride to generate lithium hexafluorophosphate. These two methods all have different shortcomings; the defect of the first method is that: the gas reacts with the solid surface, which will cause part of the gas to flow to the next link without contacting...

AI Technical Summary

Problems solved by technology

These two methods all have different shortcomings; the defect of the first method is that: the gas reacts with the solid surface, which will cause part of the gas to flow to the next link without contacting the solid, resulting in excessive consumption of raw materials; the second method The disadvantage is that: at present, there are high boilers and sulfate residues in different degrees in the anhydrous hydrogen fluoride on the market. If it is directly added to the reaction system, it will affect the quality of the product, and if it is directly added to the liquid raw material, it may be due to control Poor flow rate leads to extremely intense reaction between anhydrous hydrogen fluoride and phosphorus pentachloride, resulting in high pressure and temperature, resulting in safety accidents