Isothermal vapor–liquid equilibria for the system ethanol and n-hexane in the near critical region

Isothermal VLE data of the n-hexane and ethanol system were obtained at near-critical temperatures. A circulating type equipment with a view cell has been used and compared with the data reported by [Fluid Phase Equilibria 145 (1998) 269] for the same system at 473.15 K. The critical pressure was also determined from the critical opalescence of the mixtures. This mixture is very non-ideal due to the association of ethanol, and the data could be correlated with sufficient accuracy by using the Peng–Robinson–Stryjek–Vera (PRSV) [Can. J. Chem. Eng. 64 (1986) 323] equation of state with the Wong–Sandler mixing rules [AIChE J. 41 (1995) 683].