Paraffin hydrocarbon isomerization using swing reactor system

Claim 1

IN THE ISOMERIZATION OF A LIGHT NAPHTHA HYDROCARBON STREAM IN THE PRESENCE OF ALUMINUM BROMIDE ON A SUPPORT AND IN THE PRESENCE OF ALUMINUM BROMIDE DISSOLVED IN SAID HYDROCARBON WHEREIN THE ISOMERIZATION REACTION IS CARRIED OUT IN THE LIQUID PHASE, THE IMPROVEMENT WHICH COMPRISES CONTINUOUSLY FLOWING SAID HYDROCARBONS IN THE SAME DIRECTION OF FLOW THROUGH A TRAIN OF AT LEAST THREE REACTION ZONES IN SERIES, WHEREIN THE TEMPERATURE OF THE ISOMERIZATION REACTIONS TAKING PLACE IN THE REACTION ZONES ARE OF DECREASING MAGNITUDE GRADUALLY FROM A TEMPERATURE OF ABOUT 125*F. TO A TEMPERATURE OF ABOUT 105*F. IN THE SUCCESSIVE ISOMERIZATION REACTION ZONES, ALL OF SAID ZONES EXCEPT THE LAST ONE INITIALLY CONTAINING SAID ALUMINUM BROMIDE ON SAID SUPPORT, THE LAST REACTION ZONE OF THE SERIES INITIALLY CONTAINING SAID SUPPORT SUBSTANTIALLY DEVOID OF ALUMINUM BROMIDE, MAINTAINING HYDROCARBON ISOMERIZATION CONDITIONS IN AT LEAST ALL OF SAID REACTION ZONES EXCEPT SAID LAST ZONE, CONTINUING HYDROCARBON FLOW THROUGH SAID SERIES OF ZONES WHEREIN THE ENTIRE HYDROCAR-