Method of producing a high octane gasoline by reforming a naphtha in two stages

Claim 1

IN A METHOD FOR THE CONVERSION OF A STRAINGHT RUN HYDROCARBON FRACTION BOILING IN THE MOTOR FUEL RANGE THE STEPS COMPRISING CONTACTING SAID HYDROCARBON FRACTION WITH A PLATINUM-ALUMINUM CATALYST IN THE PRESENCE OF FREE HYDROGEN AT A TEMPERATURE OF ABOUT 825 TO 975* F. AND A PRESSURE OF ABOUT 150 TO 500 P.S.I.G. TO PROVIDE A PRODUCT BOILING IN THE MOTOR FUEL RANGE OF INCREASED OCTANE VALUE, SEPARATING A RESULTING HYDROCARBON LIQUID PRODUCT BOILING OVER A RANGE OF AT LEAST ABOUT 200* F. AND CONTAINING ABOUT 30 TO 60 WEIGHT PERCENT OF AROMATICS, CONTACTING SAID SEPARATED LIQUID PRODUCT WITH A CATALYST CONSISTING ESSENTIALLY OF HYDROGEN FLUORIDE AND BORON TRIFLUORIDE AT A TEMPERATURE OF ABOUT 150 TO 300* F. AND A PRESSURE OF ABOUT 400 TO 1500 P.S.I.G. AND SUFFICIENT TO MAINTAIN THE LIQUID PHASE TO PROVIDE A FURTHER INCREASE IN THE OCTANE QUALITY OF THE PRODUCT BOILING IN THE MOTOR FUEL RANGE, THE CONTACTED HYDROGEN FLUORIDE, BORON TRIFLUORIDE AND HYDRCARBON INCLUDING ABOUT 1 TO 2 MOLES OF BORON TRIFFLUORIDE AND ABOUT 1 TO 10 MOLES OF HYDROGEN FLUORIDE PER MOLE OF AROMATIC IN THE HYDROCARBON AND SEPARATING A MOTOR FUEL BOILING RANGE HYDROCARBON OF HIGH OCTANE QUALITY.