Gas-gas immiscibility in hydrogen mixtures

Abstract

Measurements are reported of the slope of the critical locus of binary mixtures of a series of hydrocarbons, and two fluorocarbons, with hydrogen near the critical point of the hydrocarbon (or fluorocarbon).These systems exhibit gas-gas immiscibility of the first kind. The results are compared with predictions from the one-fluid model together with 'a hard sphere + attractive term' equation of state proposed by Guggenheim.

The results can be predicted from the theory provided the energy interaction parameter, ξ, is allowed to be somewhat less than that calculated from the Hudson and McCoubrey rule. This is discussed in terms of values of ξ from other measurements, and possible deficiencies in the theory.