Experimental results for the adsorption of the binary gas mixtures oxygen-nitrogen, oxygencarbon monoxide and nitrogen-carbon monoxide on two synthetic zeolites are reported. In a l l of these experiments the temperature was -200°F. and the total pressure was 1 atm. Also reported are the isotherms for the three pure gases on the two zeolites a t -200°F. The results indicate that these zeolites have a surface selectivity which is independent of any sieving effect based on the size of the adsorbed molecules. It does not appear that the strong separations obtained can be explained in terms of the van der Waals forces which are generally believed to be dominant in physical adsorption. The available methods of predicting binary adsorption data from the pure gas isotherms have been examined, Data on the adsorption equilibria of gas mixtures are important both from a practical viewpoint for the design of gas adsorbers and on a theoretical basis for the understanding of the interactions between gases and solid surfaces. Compared to the voluminous data in the literature on pure gas adsorption, very little data are available on the adsorption of gas mixtures. For a complete understanding of the behavior of gas molecules in the sphere of influence of a solid, the forces of molecular interactions must be quantitatively treated. Such a statistical mechani- R. P. Danner is at the

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A comparative study has been made on the predictive capabilities of a number of the more popular equations of state in use today. The equations were compared in their ability to predict the locus of points for which the Joule‐Thomson coefficient is zero, the inversion curve.The prediction of an inversion curve is an extremely severe test of an equation of state. To date inversion curves have been calculated only for the Van der Waals, Dieterici, Lennard‐Jones and Devonshire, and DeBoer‐Michels equations of state. This study covers the Van der Waals and Dieterici equations as well as the Virial, Berthelot, Redlich‐Kwong, Beattie‐Bridgeman, Benedict‐Webb‐Rubin, and Martin‐Hou equations of state.The results of the investigation show, among other things, that the Redlich‐Kwong equation is quite unusual in that it predicts the inversion locus with more accuracy than any of the much more complex equations of state. Its predictive capabilities extend into the liquid region.

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