Separation process with reduced energy consumption

Claim 1

A PROCESS FOR THE RECOVERY OF SELECTED PRODUCTS FROM A VAPOURS MIXTURE OF NORMALLY GASEOUS AND GASOLINE BOILING HYDROCARBONS AND HYDROGEN WHICH COMPRISES THE STEPS OF: A. COUNTERCURRENTLY CONTACTING SAID MIXTURE WITH AN ABSORBER OIL IN AN ABSORPTION ZONE UNDER CONDITIONS TO ABSORB IN SAID OIL AND SEPARATE FROM THE MIXTURE HYDROCARBONS OF MORE THAN TWO CARBON ATOMS PER MOLECULE, B. REMOVING FROM THE UPPER PORTION OF SAID ZONE HYDROGEN AND HYDROCARBONS OF LESS THAN THREE CARBON ATOMS PER MOLECULE, C. REOVING FROM THE LOWER PORTION OF SAID ZONE A RICH ABSORBER OIL CONTAINING THE ABSORBED HYDROCARBONS AND ENTRAINED HYDROGEN AND HYDROCARBONS OF LESS THAN THREE CARBON ATOMS, D. STRIPPING SAID RICH ABSORBER OIL OF HYDROGEN AND HYDROCARBONS OF LESS THEN THREE CARBON ATOMS IN A STRIPPING ZONE, THEREBY FORMING A STRIPPED OIL PRINCIPALLY COMPRISING HYDROCARBONS OF THREE AND MORE CARBON ATOMS PER MOLECULE, INCLUDING GASOLINE BOILING HYDROCARBONS, E. SUPPLYING SAID HYDROGEN AND HYDROCARBONS OF LESSTHAN THREE CARBON ATOMS STRIPPED FROM SAID RICH ABSORBER OIL IN SAID STRIPPING ZONE TO THE LOWER PORTION OF SAID ABSORPTION ZONE, F. SUPPLYING A PORTION OF SID STRIPPED OIL TO SID ABSORPTION ZONE AS A PORTION OF SAID ABSORBER OIL, G. FRACTIONATING THE REMAINDER OF SAID STRIPPED OIL IN A FRACTIONATION ZONE MAINTAINED UNDER CONDITIONS TO SEPARATE THE SAME INTO A LIQUEFIED PETROLEUM GAS PRODUCT AND A STABILIZED GASOLINE PRDUCT, H. SUPPLYING A PORTION OF SAID STABILIZED GASOLINE PRODUCT TO SAID ABSORPTION ZONE AS ANOTHER PORTION OF SAID ABDORBER OIL, AND I. RECOVERING THE REMAINDER OF SAID STABILIZED GASOLINE PRODUCT AND SAID LIQUEFIED PETROLEUM GAS PRODUCT.