The purification equipment is a distillation method that operates in a high vacuum, when the mean free path of the vapor molecules is greater than the distance between the evaporation surface and the condensation surface, so that the liquid mixture can be separated by the difference in the evaporation rate of each component in the feed liquid. Mainly used in chemical, pharmaceutical, petrochemical, fragrance, plastic oil and other industrial fields. The minimum evaporation area of glass molecules is 0.032 square