The present invention relates to a process for producing 2,3,3,3-tetrafluoropropene comprising the steps of: a) bringing into contact, in the gas phase, 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 flow comprising 2,3,3,3-tetrafluoropropene, HCl and HF, b) cooling the product flow from the reactor of step a) to a temperature of 0 ° C. at 70 ° C, preferably at a temperature of 20 ° C to 50 ° C, c) distillation of the stream cooled in step b) to form a first stream comprising 2,3,3,3-tetrafluoropropene and HCl, and a second stream comprising HF, d) compression of the first stream obtained in step c) to form a first compressed stream, e) distillation of said first compressed stream obtained in step d) for a third stream comprising HCI and a fourth stream comprising 2,3,3,3-tetrafluoropropene, f) purification of said fourth stream obtained in step e), characterized in that step a) is carried out at a lower pressure 10 bara, preferably at a pressure of 2 to 8 bara, especially from 3 to 7 bara, more preferably from 5 to 7 bara.
展开▼
