Isothermal VLE data of n-pentane and ethanol system were obtained at near critical temperatures. A circulating type equipment with the view cell has been built and tested with the data reported by Campbell et al. [S.W. Campbell, R.A. Wilisak, J. Thodos, J. Chem. Thermodyn. 19 (1987) 449-460] for the same system at 422.6 K. 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 modified Soave-Redlich-Kwong [J.A. Sandarusi, A.J. Kidnay, V.F Jessavage, Ind. Eng. Chem. Process Des. Dev. 25 (1986) 957-963] equation of state with Huron-Vidal mixing rules [M.H. Huron, J. Vidal, Fluid Phase Eqilibria 3 (1979) 255-271].