Process of olefin isomerization using an aluminum fluoride catalyst

Claim 1

A PROCESS FOR THE SKELETAL ISOMERIZATION OF AN OLEFIN HAVING FROM 5 TO 20 CARBON ATOMS PER MOLECULE WHICH COMPRISES CONTACTING AT LEST ONE OF SAID OLEFINS AT A TEMPERATURE BETWEEN 600* TO 1200*F. AND A SPACE VELOCITY BETWEEN 0.5 TO 10 VOLUMES OF OLEFIN PER VOLUME OF CATALYST PER HOUR WITH A CATALYST CONSISTING ESSENTIALLY OF ACTIVE ANHYDROUS ALUMINUM FLUORIDE COMBINED WITH BETWEEN 0.1 AND 35 WEIGHT PERCENT OF AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF THE METLS OF GROUP VIII AND THE LEFTHAND COLUMN OF GROUPS, IV AND VI OF THE PERIODIC TABLE, THEIR OXIDES AND SULFIDES, SAID ALUMINUM FLUORIDE HAVING AN ACIDITY LEVEL WHICH IS EQUIVALENT TO THE CHEMICAL ABSORPTION OF BETWEEN 0.02 AND 0.30 MILLIEQUIVALENTS OF AMMONIA PER GRAM AT 175*C. WITH RETENTION OF BETWEEN 0.01 TO 0.20 MILLIEQUIVALENTS OF AMMONIA PER GRAM AT 400*C.