1,2,3,3,3-pentafluropropene production processes

Abstract

A process is disclosed for making CF 3 CF═CHF. The process involves reacting CF 3 CClFCCl 2 F with H 2 in a reaction zone in the presence of a catalyst to produce a product mixture comprising CF 3 CF═CHF. The catalyst has a catalytically effective amount of palladium supported on a support selected from the group consisting of alumina, fluorided alumina, aluminum fluoride and mixtures thereof and the mole ratio of H 2 to CF 3 CClFCCl 2 F fed to the reaction zone is between about 1:1 and about 5:1. Also disclosed are azeotropic compositions of CF 3 CClFCCl 2 F and HF and azeotropic composition of CF 3 CHFCH 2 F and HF.

1 . A composition comprising:
 (a) CF 3 CClFCCl 2 F and   (b) HF; wherein the HF is present in an effective amount to form an azeotropic combination with the CF 3 CClFCCl 2 F.   
     
     
         2 . A composition comprising from about 98.2 mole percent to about 78.0 mole percent HF and from about 1.8 mole percent to about 22.0 mole percent CF 3 CClFCCl 2 F which form azeotropes boiling at a temperature from between about −20° C. and about 140° C. and at a pressure from between about 3.05 psi (21.0 kPa) and about 951 psi (6557 kPa). 
     
     
         3 . A composition comprising:
 (a) 1,1,1,2,3-pentafluoropropane and   (b) HF; wherein the HF is present in an effective amount to form an azeotropic combination with the 1,1,1,2,3-pentafluoropropane.   
     
     
         4 . A composition comprising from about 81.0 mole percent to about 55. 0 mole percent HF and from about 19.0 mole percent to about 45.0 mole percent 1,1,1,2,3-pentafluoropropane which form azeotropes boiling at a temperature of from about −20° C. to about 135° C. and at a pressure of from about 4 psi (27.5 kPa) to about 550 psi (3792 kPa).