Phase equilibrium in the system water–acetonitrile–cyclohexene–cyclohexanone

Abstract

Phase equilibrium in the water–acetonitrile–cyclohexene–cyclohexanone quaternary system and in its binary and ternary constituents was studied using experimental and calculation methods. The parameters were determined for the NRTL equation that adequately describes liquid–vapor, liquid–liquid–vapor, and liquid–liquid–liquid equilibria. The evolution of the three-phase splitting region inside the concentration tetrahedron was studied on the basis of the obtained model, and its transformation into the two-phase region through the critical node was shown. Thermodynamic analysis involving topological representation for the diagram of the phase equilibrium in a quaternary system was performed, and schemes for the complete separation of the reaction mixture were proposed.