Process for enhancing the octane number of naphthas boiling within the gasoline range

Claim 1

A PROCESS FOR ENHANCING THE OCTANE NUMBER OF A FULL-BOILING RANGE GASOLINE PRODUCED IN THE THERMAL CRACKING OF A PETROLEUM GAS OIL HAVING A TOTAL SULFUR CONTENT OF NOT MORE THAN ABOUT 0.3 WEIGHT PERCENT WHICH COMPRISES FRACTIONATING SAID GASOLINE TO PROVIDE A LOW-BOILING FRACTION HAVING AN ASTM END-POINT OF ABOUT 200* F. AND A CONSECUTIVE HIGH-BOILING-RANGE FRACTION, CATALYTICALLY HYDROGENATING SAID HIGH-BOILING FRACTION AT A TEMPERATURE OF ABOUT 600-800* F. AT 300-600 P.S.I.G. OF HYDROGEN USING A LIQUID-VOLUME-HOURLY-SPACE VELOCITY BETWEEN ABOUT 1.0 AND 10.0 AND A HYDROGEN FLOW RATE OF ABOUT 1500 TO 5000 CUBIC FEET PER BARREL OF FEED AT STANDARD TEMPERATURE AND PRESSURE, REFORMING SAID HYDROGENATED HIGH-BOILING FRACTION AT A TEMPERATURE OF ABOUT 900-1050* F., AT 300-600 P.S.I.G. OF HYDROGEN USING A LIQUID-VOLUME-HOURLY SPACE VELOCITY OF ABOUT 1.0-3.0 AND A HYDROGEN FLOW RATE TO ABOUT 1500-5000 CUBIC FEET PER BARREL OF FEED AT STANDARD TEMPERATURE AND PRESSURE, AND BLENDING SAID REFORMED HIGH-BOILING FRACTION WITH SAID UNTREATED LOW-BOLING FRACTION TO PROVIDE A FULL-BOILING-RANGE-GASOLINE.