Thermal conversion of hydrocarbons

Claim 1

A THERMAL PROCESS OF CONVERSION OF A LOW OCTANE NUMBER NAPHTHA CUT TO GIVE A HIGHER OCTANE NUMBER PRODUCT SIMULTANEOUSLY WITH DEEP CRACKING OF A HEAVY OIL CUT, WHICH PROCESS COMPRISES: HEATING A LOW OCTANE NUMBER STRAIGHT RUN NAPHTHA CUT HAVING AN END BOILING POINT OF ABOUT 400*F. TO A CRACKING AND REFORMING TEMPERATURE THEREFOR OF FROM ABOUT 1050* TO 1100* F. AT A PRESSURE OF ABOUT 330 P.S.I.A. WHILE SEPARATELY AND SIMULTANEOUSLY HEATING A PETROLEUM RESIDUAL HEAVY OIL CUT HAVING AN INITIAL BOILING POINT OF AT LEAST ABOUT 600*F. TO A LOWER CRACKING TEMPERATURE THEREFOR OF ABOUT 905*F. AT A PRESSURE OF ABOUT 330 P.SI .I A. FOR A TIME INSUFFICIENT TO CAUSE APPRECIABLE COKING THEREOF; CONBINING THE THUS HEATED NAPHTHA PRODUCTS AND THE THUS HEATED HEAVY OIL IN THE RATIO OF FROM ABOUT 1:1 TO ABOUT 2:1 OF HEAVY OIL TO LIGHT OIL AND PASSING THE COMBINED PRODUCTS WITHOUT FURTHER ADDITION OF HEAT THERETO FROM AN EXTERNAL SOURCE THROUGH A REACTION ZONE OF ENLARGED CROSS-SECTION AND THEREBY EFFECTING DEEPER CRACKING AND CONVERSION OF THE HEAVY OIL BY RAISING THE TEMPERATURE THEREOF BY EXCESS OF SENSIBLE HEAT IN THE HEATED NAPHTHA PRODUCTS; SEPARAT-