VAPOR-LIQUID-EQUILIBRIA OF SOME HYDROGEN PLUS HYDROCARBON SYSTEMS WITH THE WONG-SANDLER MIXING RULE

Owing to the highly supercritical nature of hydrogen in hydrogen-hydro carbon systems, it is difficult to accurately predict, or even correla te, the phase behavior of such mixtures with cubic equations of state and conventional mixing rules, especially as the critical point of the mixture is approached. Here we show that an extended Peng-Robinson eq uation of state and the recently introduced Wong-Sandler mixing rule c an correlate these systems successfully, and more importantly that the mixing rule parameters can be generalized in terms of temperature and acentric factor of the hydrocarbon so that quite acceptable extrapola tions and predictions are possible.