METHOD AND DEVICE FOR PURIFYING 2,3,3,3-TETRAFLUOROPROPENE AND PROCESS FOR PRODUCING SAME

摘要

There is provided a method and an apparatus for efficiently obtaining 2,3,3,3-tetrafluoropropene with low contents of both organic impurities and water. The method for continuously purifying crude 2,3,3,3-tetrafluoropropene containing water and one or more organic impurities, the method including: using an apparatus having a distillation column with X stages (3 ‰¤ X, the stage closest to a column top is the first stage) and a unit for cooling and condensing a distillate; supplying the crude 2,3,3,3-tetrafluoropropene to an m-th stage (n + 1 ‰¤ m ‰¤ X, 2 ‰¤ n ‰¤ X - 1) of the distillation column; recirculating at least part of the distillate cooled and condensed in the unit for cooling and condensing to an h-th stage (1 ‰¤ h ‰¤ n - 1) of the distillation column; and taking out a liquid phase part of an n-th stage of the distillation column to obtain a purified product of 2,3,3,3-tetrafluoropropene.