Rectifying tower for purifying phosphorus pentafluoride gas

The utility model relates to the technical field of phosphorus pentafluoride gas purification, in particular to a rectifying tower for phosphorus pentafluoride gas purification, which comprises a rectifying tower body, a connecting pipe, a tubular heat exchanger, a liquid outlet pipe, a breather pipe, a Freon evaporator and a gas inlet pipe, and a plugging mechanism is arranged in the rectifying tower body at the bottom of the gas inlet pipe. According to the device, the plugging mechanism is arranged, the movable plate drives the plugging piece to move upwards through the output end of the electric telescopic rod, the top of the plugging piece is inserted into the leakage groove, the circular plate tightly abuts against the bottom end of the plugging plate, plugging is achieved through the plugging piece, the circular plate and the plugging plate, and phosphorus pentafluoride gas is introduced into the rectifying tower body through the gas inlet pipe; when the device is used for purifying the phosphorus pent