Influence of quantum effects on the high-pressure phase behavior of binary mixtures containing hydrogen

Abstract

The critical properties of binary mixtures containing hydrogen + argon, nitrogen, carbon monoxide, carbon dioxide, methane, and ethane are calculated and compared with experimental data. The properties of these mixtures are likely to be influenced by the quantization of translational motion at high densities. It is shown that the addition of a theoretically based quantum correction term to the equation of state can dramatically improve the quality of the agreement between theory and experiment. Even the simple van der Waals equation can then be used to calculate the critical properties of these mixtures with a reasonable degree of accuracy. The only additional experimental input data are the molecular weights of the constituent components. The experimental {xi}{sub 12} parameters obtained from the analysis indicate weak interaction between the different component molecules of the mixture. 35 refs., 7 figs., 1 tab.