PROCESS FOR PRODUCING 2,3,3,3-TETRAFLUOROPROPENE.

摘要

The present invention relates to a process for producing 2,3,3,3-tetrafluoropropene comprising the steps of: a) bringing into contact, in a reactor, a compound of formula (I) CH (n + 2) (X ) m-CHp (X) (n + 1) -CX (3 + pm) where X independently represents F or Cl; n, m, p are independently of each other 0 or 1 with (n + m) = 0 or 1, (n + p) = 0 or 1 and (mp) = 0 or 1, at least one X being Cl, with hydrofluoric acid to obtain a product stream comprising 2,3,3,3-tetrafluoropropene, HCl and HF, b) cooling the product stream obtained in step a) to a temperature below 50 ° C, c) distillation of the stream cooled in step b) to form a first stream comprising HCI and a second stream comprising 2,3,3,3-tetrafluoropropene and HF, d) distillation of the second stream to form a third stream comprising 2, 3,3,3-tetrafluoropropene and a fourth stream comprising HF; and characterized in that step a) is carried out at a pressure greater than or equal to 7 bara, preferably at a pressure of 7 to 25 bara, more preferably from 7 to 15 bara.