Patent ID: 6927314

Claim:
A process for the separation and treatment of a naphtha boiling range feed stock comprising compounds containing from five to seven carbon atoms, said process comprising a) passing the feedstock into a dividing wall column and separating the feed stock into a light fraction comprising compounds containing five carbon atoms or less, an intermediate fraction containing largely compounds having six carbon atoms, and a heavy fraction which comprises compounds containing more than six carbon atoms, wherein at least a portion of the feedstock is selected from the group consisting of FCC gasoline, coker naphtha, straight run gasoline, naptha fraction from a hydrocracking process, naphtha fraction from a thermal cracking process and mixtures thereof; b) passing the light fraction to a gasoline blending pool; c) treating the intermediate fraction in an isomerization zone to increase the octane number of the intermediate fraction and form an isomerate; d) passing the heavy fraction to the gasoline blending pool; and, e) passing the isomerate to the gasoline bending pool.