Quaternary, Ternary, Binary, and Pure Component Sorption on Zeolites 1. Light Alkanes on Linde S-115 Silicalite at Moderate to High Pressures

Pure component and multicomponent equilibrium data are reported for the adsorption of the first four n-alkanes on Linde S-115 silicalite in the temperature range 275-350 K and at pressures up to 1.723 MPa. The intrinsic Henry constants and the heats of adsorption are extracted from the data by using virial isotherm techniques. The data were modeled by using five isotherms explicit in partial pressure, four simple isotherms (LRC, Toth, Mathews and Weber, Jaroniec), and one statistical thermodynamic isotherm (Ruthven). The Toth model was observed to fit the data best for both the pure component and multicomponent data. The Toth model reduces to the Langmuir isotherm for methane and ethane except at 275 °K for the latter.