| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing 2,3,3,3-tetrafluoropropene stably over a long period of time while inhibiting deactivation of a catalyst by distilling and reutilizing an unreacted product without separating the unreacted product in the production of 2,3,3,3-tetrafluoropropene.SOLUTION: The method for producing 2,3,3,3-tetrafluoropropene has a step (1a) of reacting chloropropene such as 1233xf or the like with a hydrogen fluoride in the presence of a catalyst, a step of subjecting the reaction mixture produced in the reaction step to distillation (2a) to separate a first stream composed mainly of 2,3,3,3-tetrafluoropropene and a second stream composed mainly of an organic substance including an unreacted chloropropene; and an unreacted hydrogen fluoride and a step of recycling the second stream to the previous reaction. The distillation is performed under such a condition that the organic substance including the unreacted chloropropene and the unreacted hydrogen fluoride cause no separation at a second stream extraction part of a distillation column.SELECTED DRAWING: Figure 1 |
