Equations of state for n-heptane, benzene and cyclohexane system based on density data

Abstract

Cubic equations of state were studied for the ternary system of n-heptane, benzene and cyclohexane based on density data at temperature of 308.15, 313.15, 323.15 and 333.15 K and pressure of 1.01325, 2, 5 and 10 bar. Prediction of molar volume of the ternary system with a modified Redlich-Kwong (MRK) is better than Peng-Robinson (PR), Peng-Robinson-Stryjek-Vera (PRSV2), and Peng-Robinson-Stryjek-Vera (PRSV) equations of state at all temperatures and pressures. The density data of the binary systems as well as the ternary system were measured by DMA512P densitometer. Molar volume, excess molar volume and partial molar volume by PR equation of state for binary systems were presented.