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 1413.    HIBSHMAN, H. J.  Separation of Iso- and Normal Paraffins by Adsorption.  Ind. Eng. Chem., vol. 42, 1950, pp. 1310-1314; Chem. Abs., vol. 44, 1950, p. 9143.

       Activated C selectivity adsorbs n-C₅, -C₆, and –C₇ paraffins from iso-octane at room temperature.  Based on experimental data, a flow plan for a continuous separation of iso-octane and heptane is presented by using fluidized solids technique.  C introduced at the top of a column fails countercurrently to the feed and liquid reflux streams introduced at the center and bottom, respectively.  The C withdrawn at the bottom contains heptane in high purity, which is removed from the C by washing with pentane, the pentane and heptane being separated by distillation.  The pentane on the C need not be removed before the C is reused, since it appears in the filtrate with the iso-octane and is separable by distillation.  The filtrate is 90% pure iso-octane.  The process is analogous to the conventional extraction and distillation.