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

Gravimetric equilibrium isotherms are reported for adsorption of branc hed and cyclic C-6 paraffins on silicalite. In addition to the isother ms, Henry constants and heats of adsorption are reported for 2-methylp entane, 3-methylpentane, 2,2-dimethylbutane, 2,3-dimethylbutane, methy lcyclopentane, 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 temper ature. Adsorption equilibrium constants follow the trend double-branch ed < single-branched < cyclic paraffins. Heats of adsorption for the s ingle-branched paraffins increase slightly with loading, but for the d ouble-branched and cyclic paraffins the variation of heat of adsorptio n with coverage is more pronounced.