Process for the manufacture of 1,1,1,3,3-pentafluoropropane

摘要

A process is disclosed for producing the hydrofluorocarbon CF3CH2CHF2. The process involves dehydrofluorinating CF3CH2CF3 at an elevated temperature in the vapor phase over a catalyst of (1) aluminum fluoride, (2) fluorided alumina, (3) metal supported on a trivalent aluminum compound containing fluoride anion, (4) lanthanum fluoride, (5) fluorided lanthanum oxide, (6) metal supported on a trivalent lanthanum compound containing fluoride anion, (7) trivalent chromium compounds and/or (8) catalysts of (a) at least one compound selected from the oxides, fluorides and oxyfluorides of magnesium, zinc and mixtures of magnesium and zinc, and optionally (b) at least one compound selected from the oxides, fluorides and oxyfluorides of aluminum, provided that the atomic ratio of aluminum to the total of magnesium and zinc in said catalyst is about 1:4, or less, to produce a product containing CF3CH=CF2 and HF; and reacting the CF3CH=CF2 in the vapor phase with hydrogen over a hydrogenation catalyst in the presence of HF to produce CF3CH2CHF2.