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Pb = bulk density of the adsorbent, kg/m3 pf = density of the gas phase, kg/m3 T = dimensionless time Literature Cited Basmadjian, D.; Ha, K. D.; Pan, C.-Y. Ind. Eng. Chem. Process Des. Dev. Carter. J. W. AIChE J . 1975. 21, 380. Cohan, L. H. J . Am. A simple method to evaluate the binary interaction parameters of the Mathias equation of state from the UNIFAC group-contribution model is proposed and is tested agahst experimental data. Results are satisfactory for moderately dissymmetric and sufficiently subcritical systems.

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Highly asymmetric molecules interacting during rniscible-gas processes of oil recovery are responsible for the form of the reservoir fluid phase diagrams, from which feasible displacement conditions can be chosen. In order to fit the expermental fluid phase behavior, current reservoir models employ classical equations of state which cannot easily account for the polydisperse and asymmetric nature of such systems.Using a continuous thermodynamics extension of the Simplified Perturbed Hard-Chain Theory (SPHCT) equation of state of Kim et al. (1986), an alternative molecular method for representing these equilibria in reservoir-fluid systems is presented. The approach yields results which compare well with both experimental data and classical calculation procedures. __Les molkcules hautement asymktriques qui interagissent durant les prockdks de rkcupCration du pktrole gaz miscibles sont responsables de la forme des diagrammes des phases fluides dans les rkservoirs, i partir desquels des conditions de dkplacement rkalisables peuvent &re choisies. Afin de caler le comportement expkrimental des phases fluides, les modkles de rkservoirs actuels utilisent des Cquations d'ktat classiques qui ne peuvent pas tenir compte facilement de la nature polydisperske et asymktrique de tels systkmes.Par une extension thermodynamique continue de I'kquation d'ktat de la thkorie des chaines dures perturbkes simplifike (SPHCT) de Kim et al. (1986), une nouvelle mkthode mol6culaire est introduite pour la reprksentation de ces kquilibres dam des systkmes fluides en rkservoir. Cette approche donne des rksultats qui se comparent bien tant aux donnkes expkrimentales qu'aux mkthodes de calcul classiques.

The hard-sphere model is used to predict a compact form of equation of state fluid mixtures.(AIP)