MULTIPHASE BEHAVIOR AND CRITICAL LOCI IN BINARY-MIXTURES USING A NEW EQUATION OF STATE-BASED ON THE NONRANDOM LATTICE-FLUID THEORY

A nonrandom lattice theory-based equation of state presented previousl y by the present authors(1) is extended to model the multiphase behavi or and critical loci of binary complex mixtures at high pressure. Main ly for CO2-based supercritical fluid mixtures, the calculated P-T, T-c hi, and T-rho projections of the three phase SLV and LLV behaviors and the critical loci agree relatively well with the experimental data wi th only two molecular parameters for each pure component and with one binary interaction energy parameter.