PROCESS FOR PRODUCING TRANS-1,3,3,3-TETRAFLUOROPROPENE

摘要

A production process of trans-1,3,3,3-tetrafluoropropene according to the present invention includes: a reaction step of reacting 1-chloro-3,3,3-trifluoropropene with hydrogen fluoride to form trans-1,3,3,3-tetrafluoropropene and obtain a reaction product A containing the formed trans-1,3,3,3-tetrafluoropropene, unreacted 1-chloro-3,3,3-trifloropropene and hydrogen fluoride and by-produced cis-1,3,3,3-tetrafluoropropene, 1,1,1,3,3-pentafluoropropane and hydrogen chloride; a rough separation step of distilling the reaction product A obtained in the reaction step to recover a distillation bottom product containing the 1-chloro-3,3,3-trifloropropene and hydrogen fluoride, and then, supplying the recovered distillation bottom product to the reaction step; a hydrogen fluoride separation step of recovering the hydrogen fluoride from a residue B remaining after the recovery of the distillation bottom product in the rough separation step and supplying the recovered hydrogen fluoride to the reaction step; a hydrogen chloride separation step of bringing a residue C remaining after the recovery of the hydrogen fluoride in the hydrogen fluoride separation step into contact with water or an aqueous sodium hydroxide solution to thereby separate the hydrogen chloride; a dehydration drying step of dehydrating a residue D remaining after the separation of the hydrogen chloride in the hydrogen chloride separation step; and a purification step of obtaining the trans-1,3,3,3-tetrafluoropropene by distillation of a residue E remaining after the dehydration in the dehydration drying step. It is possible in the present production process to reuse the unreacted reactants and produce the target compound efficiently.