Catalytic fluoroolefin transhalogenations

Claim 1

A process for exchanging a fluorine atom from one perhaloolefin for a chlorine or bromine atom from another perhaloolefin, which comprises contacting at 90°-400° C., for a contact time of 0.001-10 seconds, a perhaloolefin of the formula ##STR3## and a perhaloolefin of the formula ##STR4## to form the perhaloolefins ##STR5## wherein X is bromine or chlorine, R 1 , R 2 , R 3 , R 5 , R 6 and R 7 when each is taken individually is selected from the class consisting of F, Cl, Br, perfluoroalkyl of 1 to 4 carbon atoms, and pentafluorophenyl; and the pairs R 2 and R 3 , and, R 6 and R 7 , when each pair is taken together, is selected from the class consisting of --CF.sub.2 --CF.sub.2 --.sub.n where n=1 or 2 and ##STR6## provided that when X is chlorine, no R group can be bromine; and when X is bromine, no R group can be chlorine; said process being carried out in the presence of a solid catalyst, as charged to the reactor, selected from the class consisting of A. chromium oxide alone or in combination with one or more of Rh°, Ru°, Ir°, Pd°, Pt°, Ag°, phosphorus oxide, silicone oxide, boron oxide or an oxide or halide of aluminum, manganese, zinc, iron, rhodium, nickel, palladium, cobalt, platinum, cerium, silver, coppr, lead bismuth, iridium, magnesium, barium, tin, lanthanum, calcium, ruthenium, iridium, zirconium, vanadium, molybdenum, or tungsten; B. aluminum oxide in combination with one or more of Rh°, Ru°, Ir°, Pd°, Pt°, Ag°, silicon oxide, phosphorus oxide, boron oxide or an oxide or halide of manganese, zinc, iron, rhodium, nickel, palladium, cobalt, platinum, cerium, silver, copper, lead, bismuth, iridium, magnesium, barium, tin, lanthanum, calcium, ruthenium, iridium, zirconium, vanadium, molybdenum, or tungsten.