Extension to mixtures of two robust hard-sphere equations of state satisfying the ordered close-packed limit

Two new hard-sphere EOS are proposed and tested using the same attractive p otential terms used by the SAFT EOS. Generalized expressions for the pair R DF at contact value, the compressibility factor, and the excess chemical po tentials have been derived. Extension to mixtures is tested using three mix ing rules for multicomponent hard-sphere fluids. The proposed EOS combined with the Santos et al. and the Barrio-Solana mixing rules reproduced the co mpressibility factors and the excess chemical potentials more accurately th an the Boublik-Mansood-Carnahan-Starling-Leland (BMCSL) EOS. However the pa ir RDF at contact value had larger deviations than those obtained with the BMCSL EOS. The combination of the proposed equations and the Barrio-Solana mixing rule gave an accurate reproduction of the compressibility factor for binary hard-sphere fluids with high diameter ratio even in the low concent ration regions of the larger spheres.