一种六氟磷酸锂的制备方法
By controlling the packing density and reaction conditions of lithium hexafluorophosphate and employing the contact reaction of hydrogen fluoride and phosphorus pentafluoride gas, the problem of residual impurities in lithium hexafluorophosphate was solved, achieving an efficient and safe preparation process and improving the purity and yield of lithium hexafluorophosphate.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHENZHEN CAPCHEM TECH CO LTD
- Filing Date
- 2022-10-21
- Publication Date
- 2026-07-17
AI Technical Summary
Existing methods for preparing lithium hexafluorophosphate suffer from problems such as high levels of residual impurities and operational difficulties. In particular, lithium fluoride and hydroxides are difficult to remove completely, and high-pressure operation poses safety hazards.
Hydrogen fluoride was used as a solvent, lithium fluoride was added and phosphorus pentafluoride gas was introduced. The bulk density of lithium hexafluoride phosphate was controlled to be 1.5-3.8 g/cm3. After cooling and crystallization, phosphorus pentafluoride gas was introduced to carry out the reaction. The reaction was carried out in multiple contacts and heated and purged under negative pressure to remove unreacted phosphorus pentafluoride gas. The reaction time and temperature were controlled.
It effectively reduces the impurity content in lithium hexafluorophosphate, improves yield and purity, simplifies the operation process, avoids high-pressure conditions, and improves production efficiency and safety.