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The Company's Continuous Preparation Process for Lithium Hexafluorophosphate Has Obtained A National Invention Patent.
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Lithium hexafluorophosphate is the core electrolyte of lithium-ion battery electrolytes, widely used in various types and models of lithium-ion power batteries, and is a national high-tech product.
The continuous preparation process of lithium hexafluorophosphate has obtained a national invention patent, patent number: 200910064811.7, invention name: Continuous preparation process of lithium hexafluorophosphate.
Lithium hexafluorophosphate is the core electrolyte of lithium-ion battery electrolytes, widely used in various types and models of lithium-ion power batteries, and is a national high-tech product.
This patent applies the plug flow reaction model to the production of lithium hexafluorophosphate, designing the reactor as a multi-stage composite structure, which can achieve full mixing and complete conversion of gas-liquid reactants in a short time, realizing the continuous production of lithium hexafluorophosphate, stabilizing product quality, shortening synthesis reaction time by more than 60%, increasing production efficiency by 2-3 times, and reducing production costs by 20%.
The continuous preparation process of lithium hexafluorophosphate involves mixing the hydrofluoric acid solution of lithium fluoride (a) with a mixed gas (b) of phosphorus pentafluoride or phosphorus pentafluoride with other gases; the mixed raw materials then undergo multi-stage synthesis reactions; the reaction products from the multi-stage synthesis enter a gas-liquid separator to remove unreacted gases, and the liquid reaction products undergo subsequent mixing reactions with additional introduced phosphorus pentafluoride gas (b) to remove any trace amounts of unreacted lithium fluoride components that may exist in the solution. The reactants are then evaporated, cooled, crystallized, filtered, and dried to obtain lithium hexafluorophosphate crystals with a purity of 99.9%; the mother liquor after crystallization is re-added with lithium fluoride to prepare solution (a) for recycling. A multi-stage tubular reactor is used, which has good mass and heat transfer performance, allowing for sufficient gas-liquid contact, continuous feeding, and discharging, thereby achieving continuous operation of the production process.
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