ADSORPTION OF BRANCHED AND CYCLIC PARAFFINS IN SILICALITE .1. EQUILIBRIUM

Gravimetric equilibrium isotherms are reported for adsorption of branched and cyclic C-6 paraffins on silicalite. In addition to the isotherms, Henry constants and heats of adsorption are reported for 2-methylpentane, 3-methylpentane, 2,2-dimethylbutane, 2,3-dimethylbutane, methylcyclopentane, and cylohexane. Adsorption capacities are in the range of 4-7 wt %. All isotherms are of type 1 in Brunauer's classification. Adsorption saturation limits, estimated from the experimental results by Langmuir regression, show a deceasing trend with increasing temperature. Adsorption equilibrium constants follow the trend double-branched < single-branched < cyclic paraffins. Heats of adsorption for the single-branched paraffins increase slightly with loading, but for the double-branched and cyclic paraffins the variation of heat of adsorption with coverage is more pronounced.