Patent ID: 7029572

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