Recovery of gas oil from a fluid coker

Claim 1

A PROCESS FOR IMPROVING RECOVERY OF GAS OIL FROM HOT VAPOROUS CRACKED PRODUCTS COMPRISING THE EFFLUENT FROM A FLUID COKING REACTION ZONE, WHICH COMPRISES PASSING SUCH HOT VAPOROUS CRACKED PRODUCTS DIRECTLY FROM SAID COKING ZONE INTO A REGION ABOVE THE BOTTOM OF A FRACTIONATING ZONE AND ABOVE A MIXING SECTION THEREIN FOR UPWARD FLOW THROUGH SAID FRACTIONATING ZONE FOR CONTACT WITH DOWNFLOWING LIQUID HYDROCARBONS THEREIN IN CLUDING CONDENSATE OIL AND FOR RECTIFICATION OF DESIRED FRACTIONS, COLLECTING A RESIDUAL BOTTOMS FRACTION IN THE BOTTOM OF SAID FRACTIONATING ZONE, REMOVING UNCONDENSED VAPORS AND GASES OVERHEAD FROM SAID FRACTIONATING ZONE, COOLING THE INTRODUCED VAPOROUS CRACKED PRODUCTS WITH SAID DOWNFLOWING LIQUID HYDROCARBONS AND ENHANCING RECOVERY OF A GAS OIL HYDROCARBON FRACTION BY INTRODUCING ABOVE THE LEVEL OF SAID COLLECTED BOTTOMS FRACTION A LIGHT HYDROCARBON GAS HAVING AN ATMOSPHERIC BOILING POING OF LESS THAN 200*F. AND AT A TEMPERATURE BELOW ABOUT 300* F. INTO SAID MIXING SECTION ARRANGED IN THE BOTTOM PORTION OF SAID FRACTIONATING ZONE, CONTACTING SAID RELATIVELY COOL HYDROCARBON GAS WITH SAID DOWNFLOWING LIQUID HYDROCARBONS IN SAID MIXING SECTION SO AS TO COOL SAID DOWNFLOWING LIQUID HYDROCARBONS AND STRIP VOLATILE MATERIAL THEREFROM WHILE HEATING SAID HYDROCARBON GAS TO SUBSTANTIALLY THE TEMPERATURE OF SAID VAPOROUS CRACKED PRODUCTS BY THE TIME SAID HYDROCARBON GAS REACHES THE REGION OF ENTRANCE OF SAID VAPOROUS CRACKED PRODUCTS TO SAID FRACTIONATING ZONE, AND CONTACTING SAID THUS HEATED HYDROCARBON GAS WITH SAID HOT VAPOROUS CRACKED PRODUCTS AND SAID DOWNFLOWING LIQUID HYDROCARBONS AS SAID HEATED HYDROCARBON GAS PASSES UPWARDLY THROUGH SAID FRACTIONATING ZONE TO DEPRESS THE HYDROCARBONS PARTIAL PRESSURE OF VAPOROUS GAS OIL HYDROCARBONS PASSING UP THROUGH SAID FRACTIONATING ZONE WITHOUT CONDENSING GAS OIL HYDROCARBONS TO INCREASE THE RECOVERY OF A LIQUID GAS OIL FRACTION FURTHER UP SAID FRACTIONATING ZONE, SAID HYDROCARBON GAS BEING SELECTED FROM THE GROUP CONSISTING OF C4 AND LIGHTER HYDROCARBON GASES, AND REMOVING SAID LIQUID GAS OIL FRACTION FROM THE UPPER PORTION OF SAID FRACTIONATING ZONE.