Density, Speed of Sound, Refractive Index, and the Derived Properties of Binary Mixtures of N,N-Dimethylacetamide with 1-Butanol, 1-Pentanol, Furfural, or Furfuryl Alcohol at Different Temperatures

The density (ρ), speed of sound (c), and refractive index (n_D) of N,N-dimethylacetamide (DMA) with 1-butanol, 1-pentanol, furfural (FFL), or furfuryl alcohol (FA) as a function of composition and at T = 293.15 to 323.15 K with an interval of 10 K and atmospheric pressure were measured. From the experimental data, the excess molar volume (V_m^E), isentropic compressibility (κ_s), intermolecular free length (L_f), specific acoustic impedance (Ζ), relative association (R_A), relaxation strength (r), Rao’s molar sound function (R), excess isentropic compressibility (k_s^E), and excess refractive index (n_D^E) properties were calculated. These results were successfully fitted to the Redlich-Kister polynomial equation. The obtained results were discussed in terms of the nature of molecular interactions. The perturbed chain statistical associating fluid theory equation of state (PC-SAFT EoS) as a predictive approach was used for modeling the density of the binary mixtures. Schaaffs's collision factor theory (SCFT) and Nomoto’s relation (NR) were successfully applied for predictive modeling the speed of sound of the binary mixtures, and four mixing rules were used for the modeling of the refractive index of the mixtures.