Combination process of isomerization and a sorption process followed by selective frationation

Claim 1

A PROCESS FOR PRODUCING A HEXANE HAVING A HIGH OCTANE NUMBER FROM A FEED STOCK MIXTURE OF C6 PARAFFINS AND NAPHTHENES WHICH COMPRISES SUBJECTING SAID FEED STOCK MIXTURE OF C6 PARAFFINS AND NAPHTHENES TO ISOMERIZATION IN THE PRESENCE OF AN ISOMERIZATION CATALYST AT ISOMERIZATION CONDITIONS WITHIN A REACTION ZONE, DEBUTANIZING THE RESULTING ISOMERIZATION REACTION ZONE PRODUCT AND THEREAFTER CONTACTING THE LATTER WHICH A SOLID SORBENT IN A SORPTION ZONE TO EFFECT THE SELECTIVE SORPTION OF THE NORMAL HEXANE COMPONENT OF THE ISOMERIZATION PRODUCT AND THE SELECTIVE REJECTION OF BRANCHED CHAIN HEXANES AND CYCLOPARAFFINS, SEPARATELY WITHDRAWING FROM THE SORPTION ZONE A STREAM COMPRISING THE THUS REJECTED HYDROCARBON STREAM HAVING AN OCTANE NUMBER GREATER THAN SAID FEED STOCK SEPARATELY CONTACTING SPENT SORBENT WITH LIQUID BUTANE FROM THE DEBUTANIZING STEP TO REMOVE SAID NORMAL HEXANE COMPONENT FROM THE SPENT SORBENT, RECOVERING A DESORBED EFFUENT COMPRISING NORMAL HAXINE AND PASSING THE LATTER TO SAID ISOMERIZATION REACTION ZONE FOR ISOMERIZATION TREATMENT THEREIN TOGETHER WITH SAID FEED STOCK MIXTURE, PASSING THE REJECTED HYDROCARBON STREAM TO A FIRST FRACTIONAL DISTILLATION ZONE, SEPARATING THEREFROM A FIRST OVERHEAD COMPRISING DIMETHYLBUTANES, SUBJECTING THE RESIDUE OF SAID FIRST FRACTIONAL DISTALLATION TO A SECOND FRACTIONAL DISTILLATION ZONE AND THEREBY SEPARATING AN OVERHEAD COMPRISING MONOMETHYLPENTANES, RECYCLING SAID LAST MENTIONED OVERHEAD TO SAID ISOMERIZATION REACTION ZONE, AND RECOVERING A SECOND DISTILLATION RESIDUE COMPRISING BRANCHED CHAIN AND CYCLIC C6 HYDROCARBONS FROM THE BOTTOM OF SAID SECOND FRACTIONATION ZONE.