Catalytic cracking of residual oils and pitch

Claim 1

IN THE CATALYTIC CRACKING OF LIQUID RESIDUAL HYDROCARBONS WHEREIN SAID RESIDUAL HYDROCARBONS ARE ADMIXED WITH A FINELY DIVIDED CATALYST WHICH HAS BEEN HEATED TO A CRACKING TEMPERATURE OF SAID RESIDUAL HYDROCARBON AND CONVEYED AS A CONFINED STREAM TO A REACTION-DISENGAGING ZONE FROM WHENCE HYDROCARBON PRODUCTS ARE RECOVERED IN VAPOR FORM AND CYCLE OILS ARE SEPARATED AND RETURNED TO THE REACTION WITH THE RESIDUAL HYDROCARBON, THE IMPROVEMENT COMPRISING SOLVENT EXTRACTING A CYCLE OIL TO PRODUCE AN AROMATIC EXTRACT AND A PARAFFINIC RAFFINATE; DISSOLVING 1 VOLUME OF PITCH IN ABOUT 1 TO 5 VOLUMES OF SAID EXTRACT; ADMIXING ONE VOLUME OF THE SOLUTION OF PITCH IN EXTRACT WITH 0.5 TO 6 VOLUMES OF SAID PARAFFINIC RAFFINATE; ADMIXING ABOUT 0.5 TO 25 POUNDS OF LIQUID WATER WITH EACH BARREL OF COMBINED PITCH SOLUTION AND PARAFFINIC HYDROCARBON; PASSING THE RESULTING ADMIXTURE OF WATER, PITCH, AROMATIC HYDROCARBON AND PARAFFINIC HYDROCARBON INTO CONTACT WITH HEATED CATALYST IN A CONFINED ZONE; PASSING THE RESULTING SUSPENSION OF CATALYST IN VAPORIZED WATER, PITCH, AROMATIC HYDROCARBON AND PARAFFINIC HYDROCARBON IN SAID CONFINED ZONE AND SEPARATE FROM SAID RESIDUAL HYDROCARBONS TO SAID REACTION-DISENGAGING ZONE.