Two-stage hydrogen donor diluent cracking process

Claim 1

A HYDROCARBON CONVERSION PROCESS WHICH COMPRISES MIXING 1 VOLUME OF A HEAVY OIL WITH 0.2 TO 2 VOL. OF A HYDROGEN DONOR DILUENT CONTAINING MAJOR PORPORTIONS OF AROMATIC-NAPHTHENICS BOILING IN A RANGE WITHIN THE LIMITS OF 400* AND 1000*F. AND WITH 0.5 TO 2 VOLUMES OF A RECYCLED BOTTOMS FRACTION BOILING ABOVE ABOUT 900*F., SUBJECTING THE MIXTURE TO CONDITIONS OF HYDROGEN DONOR DILUENT CRACKING INCLUDING A PRESSURE IN THE RANGE OF 14 TO 800 P.S.I., A TEMPERATURE IN THE RANGE OF 700* TO 1000*F., AND A COMBINED FEED RATE IN THE RANGE OF 0.25 TO 15 V./V./HR. TO OBTAIN 1000*F.- CONVERSIONS OF SAID OIL IN A RANGE OF 40 TO TO 70 VOL. PERCENT, SEPARATING THE MIXTURE SO TREATED TO SECURE PRODUCTS BOILING BELOW THE BOILING RANGE OF SAID AROMATIC-NAPHTHENES, SPENT HYDROGEN DONOR DILUENT, GAS OILS, AND SAID BOTTOMS FRACTION, REGENERATING SAID SPENT HYDROGEN DONOR DILUENT BY PARTIAL HYDROGENATION IN A CATALYST HYDROGENATION ZONE AND RECYCLING THE MATERIAL SO HYDROGENATED, ADMIXING SAID GAS OILS WITH 0.2 TO 2 VOLS. OF A RELATIVELY LOW BOILING HYDROGEN DONOR DILUENT PER VOL. OF GAS OIL, SAID RELATIVELY LOW BOILING HYDROGEN DONOR DILUENT COMPRISING MAJOR PROPORTIONS OF AROMATIC-NAPHTHENES BOILING IN A RANGE WITHIN THE LIMITS OF 400* TO 700*F., AND A RECYCLED SECOND BOTTOMS FRACTION BOILING ABOVE ABOUT 650*F., SUBJECTING THE RESULTING MIXTURE TO CONDITIONS OF HYDROGEN DONOR CRACKING INCLUDING A PRESSURE IN THE RANGE OF 50 TO 1000 P.E.I., A TEMPERATURE IN THE RANGE OF 750* TO 1000*F., AND A COMBINED FEED RATE IN THE RANGE OF 0.5 TO 10 V./V./HR. TO OBTAIN A 430*F.- CONVERSION OF SAID GAS OIL IN THE RANGE OF 50 TO 90 VOL. PERCENT, SEPARATING THE MIXTURE SO TREATD TO OBTAIN PRODUCTS, TO RECOVER SPENT RELATIVELY LOW BOILING HYDROGEN DONOR DILUENT, AND TO SECURE SAID SECOND BOTTOMS FRACTION, REGENERATING SAID SPENT RELATIVELY LOW BOILING HYDROGEN DONOR DILUENT BY PARTIAL HYDROGENATION IN A CATALYTIC HYDROGENATION ZONE AND RECYCLING AND ADMIXING THE MATERIAL SO HYDROGENATED WITH SAID GAS OILS.