Catalytic reforming proces of selective fractions

Claim 1

A GASOLINE REFORMING PROCESS WHICH COMPRISES FRACTIONATING A STRAIGHT-RUN NAPHTHA BOILING IN THE FULL GASOLINE BOILING RANGE INTO A PARAFFINIC FRACTION BOILING BELOW ABOUT 145*F., A FRACTION BOILING BETWEEN ABOUT 145* F. AND ABOUT 210*F., AND A FRACTION BOILING ABOVE ABOUT 210*F., CONTACTING THE 145-210*F. FRACTION IN A FIRST REFORMING ZONE, IN THE PRESENCE OF ADDED HYDROGEN, WITH A CATALYST COMPRISING PLATINUM, ALUMINA, AND FLUORINE, UNDER ISOMERIZING CONDITIONS OF TEMPERATURE AND PRESSURE, RECOVERING A FIRST REFORMATE, FRACTIONATING THE FIRST REFORMATE TO RECOVER A PARAFFINIC FRACTION BOILING BELOW ABOUT 160*F., AND A FRACTION OF ENHANCED OCTANE NUMBER BOILING ABOVE 160*C., BLENDING, WITH THE NAPHTHA FRACTION BOILING ABOVE 210*F., A LOWER BOILING PARAFFINIC FRACTION SELECTED FROM THE NAPHTHA FRACTION BOILING BELOW 145*F., AND ADMIXTURES THEREOF WITH THE FIRST REFORMATE FRACTION BOILING BELOW ABOUT 160*F., AND THE HEREINAFTER SPECIFIED PARAFFINIC FRACTION BOILING BELOW 210*F., IN SUCH PROPORTIONS THAT AT LEAST 20% OF THE BLEND WILL BOIL BELOW 210*F., CONTACTING THE BLEND IN A SECOND REFORMING ZONE, IN THE PRESENCE OF ADDED HYDROGEN, WITH A HYDROGENATION-DEHYDROGENATION CATALYST UNDER DEHY-