Production of ethylene

Claim 1

THE PROCESS OF RECOVERING ETHYLENE FROM A NORMALLY GASEOUS MIXTURE THEREOF WHICH INCLUDES HYDROGEN, WHICH COMPRISES PASSING SAID MIXTURE IN COUNTERCURRENT RELATION TO A HYDROCARBON ABSORPTION OIL WHICH IS LARGELY AROMATIC UNDER A SUBSTANTIAL SUPERATMOSPHERIC PRESSURE AND AT A TEMPERATURE WHEREIN ALL MATERIALS BOILING ABOVE METHANE PLUS SOME METHANE ARE ABSORBED, REMOVING HYDROGEN AND A SUBSTANTIAL PART BUT LESS THAN ALL OFF THE METHANE OVERHEAD, MAINTAINING A BOTTOMS TEMPERATURE SUFFICIENT TO DRIVE MOST OF THE METHANE OUT, REMOVING THE ABSORBENT MIXTURE FROM THE BOTTOM OF THE ABSORBER AND RECTIFYING IT IN THE PRESENCE OF REFLUX CONDENSATE INTO AN OVERHEAD COMPRISING THE VOLATILE HYDROCARBONS OF NOT MORE THAN TWO CARBONS ATOMS PER MOLECULE, AND A LIQUID BOTTOMS COMPONETN, FURTHER RECTIFYING SAID VOLATILE OVERHEAD IN A SECOND STAGE IN THE PRESENCE OF REFLUX CONDENSATE TO RE-