Processes for producing 2,3,3,3-tetrafluoropropene, a process for producing 1-chloro-2,3,3,3-pentafluoropropane and azeotropic compositions of 1-chloro-2,3,3,3-tetrafluoropropene with HF

摘要

A process is disclosed for making CH₂═CFCF₃. The process involves contacting CH₂ClCF₂CF₃ with H₂ in a reaction zone in the presence of a catalyst including a catalytically effective amount of palladium supported on a support selected from chromium oxide, fluorinated chromium oxide, chromium fluoride, aluminum oxide, aluminum fluoride and/or fluorinated alumina, to produce CH₂═CFCF₃. The mole ratio of H₂ to the CH₂ClCF₂CF₃ fed to the reaction zone is between about 1:1 and about 4:1. Also disclosed is another process for making CH₂═CFCF₃ that involves (a) reacting CH₂ClCF₂CF₃ with H₂ in the presence of a catalytically effective amount of hydrogenation catalyst to form CH₃CF₂CF₃; and (b) dehydrofluorinating CH₃CF₂CF₃ from (a) to form CH₂═CFCF₃; and another process for making CH₂═CFCF₃ that involves (1) dehydrofluorinating CH₂ClCF₂CF₃ in the presence of a catalytically effective amount of dehydrofluorination catalyst to form CHCl═CFCF₃; and (2) hydrogenating CHCl═CFCF₃ from (1) in the presence of a hydrogenation catalyst including a catalytically effective amount of palladium supported on a support selected from chromium oxide, fluorinated chromium oxide, chromium fluoride, aluminum oxide, aluminum fluoride and/or fluorinated alumina to form CH₂═CFCF₃. Also disclosed is a process for making CH₂ClCF₂CF₅. This process involves reacting CH₂ClF with CF₂═CF₂ in a reaction zone in the presence of a catalytically effective amount of an aluminum halide composition having a bulk formula of AlCl_xBr_yF_3-x-y wherein the average value of x is 0 to 3, the average value of y is 0 to 3-x, provided that the average values of x and y are not both 0. Also disclosed is an azeotropic composition including CF₃CF═CHCl and HF.