Study the Vapor-Liquid Equilibrium and Excess Volume for the Binary Mixtures of Aqueous Solutions of Two Industrial Petroleum Solvents and Aromatic Hydrocarbon

Isobaric vapor-liquid equilibrium data were determined at 101.33 kPa for the binary mixtures of water + sulfolane and water + tetraethylene glycol. Calculations of the non ideality of the vapor phase were made with the second virial coefficients obtained from the Hayden-O’Connell method. The boiling points and vapor-phase compositions reported were well correlated by the Wilson, NRTL, and UNIQUAC models. In addition, the densities of binary mixtures of water + sulfolane, water + tetraethylene glycol, and benzene + tetraethylene glycol were determined over the entire concentration range at 298.15K and atmospheric pressure. Excess volumes were calculated for each data point. All mixtures exhibit negative excess volumes with a minimum which occurs at for the benzene + tetraethylene glycol system; it is shifted toward the water-rich region for the water + sulfolane and water + tetraethylene glycol systems. The experimental excess volumes were correlated using the Redlich-Kister equation.