2-PHASE AND 3-PHASE EQUILIBRIA IN SYSTEMS CONTAINING BENZENE-DERIVATIVES, CARBON-DIOXIDE, AND WATER AT 373.15 K AND 10-30 MPA

Phase equilibria in binary and ternary systems containing benzene deri vatives, carbon dioxide, and water have been investigated experimental ly at a temperature of 373.15 K and pressures ranging from 10 to 30 MP a. The experimental results and literature data for further systems in cluding benzene derivatives, carbon dioxide, and water provide a basis of experimental phase equilibrium data, clearly showing the influence of the number and the position of methyl and hydroxy groups of benzen e derivatives that are in phase equilibria with carbon dioxide and wat er. The experimental data have been correlated using the equations of state by Peng and Robinson [D.-Y. Peng, D.B. Robinson, A new two-const ant equation of tate, Ind. Eng. Chem., Fundam., 15 (1976) 59-64] and Y u and Lu [J.-M. Yu, B.C.-Y. Lu, A three-parameter cubic equation of st ate for asymmetric mixture density calculations, Fluid Phase Equilibri a, 34 (1987) 1-19] with the mixing rule proposed by Mathias et al. [P. M. Mathias, H.C. Klotz, J.M. Prausnitz, Equation-of-State mixing rules for multicomponent mixtures: The problem of invariance, Fluid Phase E quilibria, 67 (1991) 31-44]. The phase behavior of ternary systems det ermined experimentally, can be predicted well, using two binary intera ction parameters per binary system, optimized to reproduce the phase e quilibria of the binary subsystems. (C) 1997 Elsevier Science B.V.