Recovery of desorbent components

Claim 1

IN A CYCLIC ADSORPTION PROCESS WHEREIN A BED OF ADSORBED ON WHICH AROMATIC HYDROCARBONS ARE ADSORBED IN PREFERENCE TO SATURATED HYDROCARBONS IS ALTERNATIVELY CONTACTED WITH A HYDROCARBON CHARGE STOCK COMPRISING ARMOATICS AND SATURATES BOILING IN THE LUBRICATING OIL RANGE IN ADMIXTURE WITH A LOWER BOILING SATURATED HYDROCARBON DILUENT, AND WITH A DESORBENT COMPRISING AN AROMATIC HYDROCARBON BOILING BELOW THE BOILING RANGE OF THE CHARGE STOCK IN ADMIXTURE WITH A FURTHER QUANTITY OF SAID DILUENT, THE DILUENT BOILING BELOW THE SAID DESORBENT AROMATIC COMPONENT, AND IN WHICH DURING EACH CYCLE THE EFFLUENT FROM THE ADSORBENT IS COLLECTED IN A FIRST PORTION COMPRISING CHARGE SATURATES, DILUENT, AND DESORBENT AROMATICS, AND IN A SECOND PORTION COMPRISING CHARGE AROMATICS, DILUENT, AND DESORBENT AROMATICS; THE IMPROVEMENT WHICH CONSISTS IN SUBJECTING EACH OF SAID PORTIONS TO FRACTIONAL DISTILLATION, RECOVERING FROM SAID FRACTIONAL DISTILLATION A CHARGE SATURATE FRACTION, A CHARGE AROMATICS FRACTION, A VAPORIZED DILUENT FRACTION, AND A FRACTION COMPRISING DILUENT AND DESORBENT AROMATICS, SAID CHARGE SATURATE FRACTION AND CHARGE AROMMATICS FRACTION CONTAINING MINOR AMOUNTS OF DESORBENT AROMATICS, SEPARATELY CONTACTING THE CHARGE SATURATED FRACTION AND THE CHARGE AROMATICS FRACTION WITH A PORTION OF SAID VAPORIZED DILUENT FRACTION IN AN AMOUNT AND AT A TEMPERATURE SUFFICIENT TO SUBSTANTIALLY COMPLETELY STRIP DESORBENT AROMATICS FROM THE SAID FRACTIONS, AND RECOVERING A CHARGE SATURATE FRACTION AND A CHARGE AROMATICS FRACTION ESSENTIALLY FREE OF DESORBENT AROMATICS.