| Popis: |
A monolayer of adsorption is used to interpret the adsorption onto silica gel of ternary solutions containing n-heptane, toluene, and methanol. The model takes into account the non-ideality of the bulk liquid using previously-evaluated Wilson parameters. It is found satisfactory to assume that the surface phase is ideal. Surface parameters of the theory are obtained from isotherm measurements and cumulative-heat-of-replacement measurements on the following binary systems: n-heptane/toluene, n-heptane/methanol, and toluene/methanol. These binary parameters are used to predict the adsorption properties (excess surface numbers and cumulative heat of replacement) of ternary solutions; the results are compared with experiment. General equations have been developed for ternary systems that allow one to interpret the heat measured in a flow calorimetry experiment. These equations relate to one another the cumulative heat of replacement, the heat of immersion, and the (theoretical) surface enthalpy. |
