Phosphorus pentafluoride purification device

The utility model relates to a phosphorus pentafluoride purification device. According to the technical scheme, the middle section of a dehydrofluorination tower is connected to an impurity-containing intermediate product buffer tank through a compressor, the bottom of the dehydrofluorination tower is connected to a tube pass inlet of a hydrogen fluoride cooler through a pipeline, and a tube pass outlet is connected to a hydrogen fluoride intermediate tank through a pipeline; the top of the dehydrofluorination tower is connected to a tube pass inlet of the phosphorus pentafluoride preheater through a pipeline, a tube pass outlet is connected with the phosphorus pentafluoride after-rectification storage tank through a pipeline, and an outlet of the phosphorus pentafluoride after-rectification storage tank is connected to the lithium hexafluorophosphate synthesis kettle through a pipeline. The device has the beneficial effects that the problem that an intermediate product synthesized by a phosphorus pentafluori