Binary Liquid–Liquid Equilibria of γ-Valerolactone with Some Hydrocarbons

Liquid–liquid equilibrium data in binary systems γ-valerolactone + hydrocarbon ( n -heptane, n -decane, n -dodecane, cyclohexane, and 2,4,4-trimethyl-1-penetene) were determined by direct analytical and cloud-point methods. The experimental data were smoothed by the extended scaling law equation which respects nonclassical behavior of fluid mixtures in critical loci. The nonrandom two-liquid equation’s parameters were evaluated from the data obtained, as well. Since the molecule of γ-valerolactone retains a quite high dipole moment, the acquired experimental data on liquid–liquid equilibrium were used for the testing of predictive capabilities of the perturbed-chain polar SAFT equation of state (PCP-SAFT) in comparison to the original PC-SAFT model. Vapor pressures of γ-valerolactone in the temperature range from 264 K to 313 K and its liquid densities at temperatures from 288 K to 363 K were measured and utilized for evaluation of the PCP-SAFT and PC-SAFT parameters. It was found that prediction of liquid–liquid equilibrium performed by the polar PCP-SAFT equation with pure component parameters can be classified as relatively successful.