Group contribution multifluid lattice theory for simultaneous predictions of thermodynamic properties of pure fluids and mixtures

A unified group contribution (GC) lattice equation of state (EOS) was formu lated based on the multifluid approximation of the nonrandom lattice fluid theory. The GC-EOS requires segment size and interaction energy parameter f rom functional group characteristics. The unique feature of the approach is that a single set of group parameters are used for both pure fluids and mi xtures. The approach was found to be quantitatively applicable for predicti ng thermodynamic properties of real pure fluids and mixtures. Its potential utility was demonstrated for vapor pressures, vapor-liquid coexistence den sities of pure fluids and phase equilibrium properties of mixtures includin g polymeric solutions. (C) 1999 Elsevier Science B.V. All rights reserved.