The phase behaviour of binary mixtures containing hydrogen

Abstract

The solubility and gas-liquid critical temperatures of mixtures of hydrogen with the permanent gases has been discussed in terms of the one-fluid model and 'hard sphere + attractive term' equations of state as proposed by Carnahan and Starling and Guggenheim. The solubilities of hydrogen and 'moderately-sized' hydrocarbons such as benzene and cyclohexane and higher hydrocarbons such as decalin and bicyclohexyl have also been discussed in terms of the one-fluid model. Finally, examples of the solubilities of other small molecules, methane, nitrogen and carbon dioxide, in both 'moderately sized' and higher hydrocarbons are considered in terms of the one-fluid model. It is concluded that :

(A) The best fit values of the interaction parameter, ζ, for all mixtures, except the permanent gas+ hydrogen systems, are considerably smaller than predicted by the Hudson and McCoubrey rule.

(B) The values of ζ for the hydrogen+ hydrocarbon mixtures are considerably smaller than those for similar hydrocarbons + other small molecules.

(c) Often the best fit value of ζ decreases with an increase in temperature.