Aromatic recovery process

Claim 1

A CONTINUOUS PROCESS FOR THE EXTRACTION AND RECOVRY OF AROMATIC HYDROCARBON FROM A NARROW BOILING RANGE STRAM OF AROMATIC AND PARAFFINIC HYDROCARBONS WHEREIN SAID STREAM OF HYDROCARBONS IS PASSED SUCCESSIVELY THROUGH EACH OF THREE BEDS OF ADSORPTION SILICA GEL COMPRISING PASSING SAID STREAM OF HYDROCARBONS THROUGH THE FIRST OF THE THREE BEDS OF ABSORBENT; PASSING A STREAM OF VAPOROUS BUTANE INTO SAID FIRST BED OF ADSORBENT AND CONDENSING SAID BUTANE THEREIN TO LIBERATE HEAT OF CONDENSATION, REMOVING FROM SAID FIRST BED THE UNADSORBED PORTION OF THE STREAM OF HYROCARBONS REMAINING IN SAID FIRST BED, AND SUBSEQUENTLY REMOVING THEREFROM A MIXTURE OF LIQUID BUTANE AND PARAFFINIC HYDROCARBONS; PASSING INTO SAID FIRST BED A STREM OF VAPOROUS BUTNAE AT A TEMPERATURE OF FROM 400* TO 600* F. AND REMOVING FROM SAID FIRST BED A MIXTURE OF AROMATIC HYDROCARBON AND BUTANE, RECOVERING FROM THIS LATTER MIXTURE AND AROMATIC HYDROCARBON AS ONE PRODUCT OF THE PROCESS, AND VAPOROUS BUTANE; PASSING VAPOROUS BUTANE AT 150* F. INTO SAID FIRST BED FROM WHICH AROMATIC HYDROCARBON HAS BEEN DESORBED AT 400* TO 600* F. TO COOL SAID FIRST BED OF GEL AND TO HEAT THE VAPOROUS BUTANE; AND AFTER THE COOLING OF SAID FIRST BED PASSING THEREINTO SAID TO COMPLETE THE CYCLE.