Abstract:
A CATALYST IS DISCLOSED FOR PREPARING FLUORINATED OR CHLOROFLUORINATED HYDROCARBONS BY FLUORINATION OR CHLOREFLUORINATION OR DISPROPORTIONATION REACTIONS OR CHLOPHASE, WHICH CATALYST COMPRISES ALUMINUM FLUORIDE CONTAINING MINOR QUANTITIES OF ZINC, CHROMIUM, NICKEL AND PREFEABLY ALSO IRON COMPOUNDS WHICH ARE PRESENT IN QUANTITIES CORRESPONDING TO THE FOLLOWING PRECENTAGES BY WEIGHT OF METAL BASED ON THE TOTAL: FROM 0.05 TO 5% ZN, FROM 0.05 TO 5% CR, FROM 0.05 TO 5% NI, AND UP TO 3% FE. THE ZINCE, CHROMIUM, NICKEL AND IRON, IF ANY, ARE PRESENT AT LEAST PARTLY IN THE FORM OF HALIDES, IN PARTICULAR FLUORIDES, OR OXIDES OR OXY-HALIDES. A PROCESS FOR PARPARING THE CATALYST IS DISCLOSED, AS WELL AS VARIOUS DETAILS RELATING TO THE AFORESAID PROCESS FOR USING THE CATALYST.
Abstract:
A catalyst is disclosed for the preparation of fluroinated or chlorofluorinated hydrocarbons through fluorination or chlorofluorination reactions in gaseous phase, the catalyst comprising aluminum fluoride or fluorinated alumina containing minor quantities of manganese, chromium and preferably also nickel compounds present in quantities corresponding to the following percentages by weight of metal based on the total: from 0.05 to 5% of Mn, from 0.1 to 5% of Cr, and up to 5% of Ni. The manganese, the chromium and (when present) the nickel are at least partially present in the form of halides, and in particular the fluorides, or as oxides or as oxy-halides.