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1. (WO2018197788) METHOD FOR THE PRODUCTION AND PURIFICATION OF 2,3,3,3-TETRAFLUOROPROPENE

Pub. No.:    WO/2018/197788    International Application No.:    PCT/FR2018/050995
Publication Date: Fri Nov 02 00:59:59 CET 2018 International Filing Date: Sat Apr 21 01:59:59 CEST 2018
IPC: C07C 17/20
C07C 17/25
C07C 17/383
C07C 21/18
C07C 19/08
Applicants: ARKEMA FRANCE
Inventors: DEUR-BERT, Dominique
PIGAMO, Anne
WENDLINGER, Laurent
Title: METHOD FOR THE PRODUCTION AND PURIFICATION OF 2,3,3,3-TETRAFLUOROPROPENE
Abstract:
The invention relates to a method for the production of 2,3,3,3-tetrafluoropropene using a starting composition, comprising the steps of: bringing the starting composition into contact with HF, in the presence of a catalyst, in order to produce a composition A comprising 2,3,3,3-tetrafluoropropene (HFO-1234yf), intermediate products B consisting of 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf), 1,1,1,2,2-pentafluoropropane (HFC-245cb), and secondary products C consisting of E-1-chloro-3,3,3-trifluoro-1-propene (HCFO-1233zd E), trans-1,3,3,3-tetrafluoro-1-propene (HFO-1234zeE) and 1,1,1,3,3-pentafluoropropane (HFC-245fa); recovering composition A and purifying same in order to form and recover a first gas stream G1 comprising HCl, 2,3,3,3-tetrafluoropropene (HFO-1234yf), some of the unreacted HF, some of the intermediate products B and some of the secondary products C, and a preferably liquid stream L1 comprising some of the unreacted HF, some of the intermediate products B and some of the secondary products C.