Patent ID: 7037422

Claim:
A process for producing a high RON naphtha which comprises contacting a hydrocarbon feed stream comprising a mixture of the isomers of C 5 and C 6 paraffins with CFI zeolite in an adsorption zone, whereby the branched isomers of the C 5 and C 6 paraffins are preferentially adsorbed by the CFI zeolite as compared to the straight chain isomers, desorbing the branched isomers of the C 5 and C 6 paraffins from the CFI zeolite, and recovering a naphtha product from the adsorption zone having a higher RON than the hydrocarbon feed stream wherein the adsorption zone is maintained under hydroisomerization conditions and the CFI zeolite also serves as a hydroisomerization catalyst to selectively isomerize pentane to methylbutane and isomerize monomethylpentane and n-hexane to dimethylbutane.