Experimental determination and modeling of densities and refractive indices of the binary mixtures of dimethylphthalate (or dimethyladipate) + 1-butanol, or +2-butanol, or +2-butanone at T = (288.15–323.15) K

The experimental density ρ and refractive index nD of the six binary mixtures of dimethylphthalate and dimethyladipate with 1-butanol, 2-butanol and 2-butanone have been determined. All measurements of ρ and nD have been performed simultaneously at eight temperatures (288.15, 293.15, 298.15, 303.15, 308.15, 313.15, 318.15 and 323.15) K, and atmospheric pressure. Excess molar volumes VmE and deviations of refractive indices ΔnD were correlated by the Redlich–Kister equation.In addition, correlation of VmE have been performed with the Peng–Robinson–Stryjek–Vera cubic equation of state (PRSV CEOS) with two different types of mixing rules: the van der Waals (vdW1) and mixing rule introduced by Twu et al. (TCBT). For the refractive index calculations several mixing rules were employed: Lorentz–Lorenz, Dale–Gladstone, Eykman, Arago–Biot, Newton and Oster.

► ρ and nD of dimethylphthalate (or dimethyladipate) + 1-butanol, +2-butanol, +2-butanone.
► For the correlation of VmE data three parameters models (vdW1-3 and TCBT) are recommended.
► Oster mixing rules are suggested for refractive indices calculations.