(276a) On the Use of the Dual Process Langmuir Model for Predicting Mixed Gas Isotherms of Methane, Ethane and Ethylene Binary and Ternary Mixtures on Activated Carbon

The ability of the mixed gas dual process Langmuir (DPL) model to predict both binary and ternary mixtures of methane, ethane, and ethylene on activated from the work of Reich, Ziegler and Rogers¹ is evaluated against predictions carried out by ideal adsorbed solution theory (IAST) either globally or at each Langmuir process individually. Perfect positive correlations are assumed between all three species. Saturation loadings for each of process in all species are assumed to be different and hence not thermodynamically consistent, which is commonly don with the mixed gas DPL model. Predictions are evaluated against experimental data around 130, 350, 680 and 1280 kPa at 28.3 and -60.45 ^oC. The results show significant agreement between the mixed gas DPL model predictions and the experimental data, even though the experimental are well known to exhibit non-ideal behavior. The results also show that the mixed gas DPL is able to predict just as accurately as the far more complex models, such as the IAST.