Preparation method of phosphorus trifluoride

The invention provides a phosphorus trifluoride preparation method, which comprises: mixing a phosphorus triiodide organic solution and a fluorinated metal salt, and carrying out a reaction until no bubble is generated to obtain phosphorus trifluoride, the fluorinated metal salt comprises any one or a combination of at least two of sodium fluoride, potassium fluoride or aluminum fluoride. The preparation method is simple to operate, the phosphorus trifluoride product with stable quality, high purity and few impurities is obtained by selecting proper fluorinated metal salt, and the preparation method is suitable for industrial production of high-purity phosphorus trifluoride. 本发明提供了一种三氟化磷的制备方法，所述制备方法包括如下步骤：混合三碘化磷有机溶液与氟化金属盐，反应至无气泡产生，得到三氟化磷；所述氟化金属盐包括氟化钠、氟化钾或氟化铝中的任意一种或至少两种的组合。所述制备方法操作简单，通过选择合适的氟化金属盐，实现了质量稳定、纯度高、杂质少的三氟化磷产品，适用于工业化生产高纯度的三氟化磷。