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The measured data (549 points) of density, (ρ), speed of sound, (u), and refractive index, (n D ) are presented in this work for binary and ternary mixtures containing dibutyl ether (DBE), 1-butanol, toluene, and cyclohexane at 298.15 K and 0.1 MPa. Therefore, derivative properties such as excess volume, V E , deviation in the speed of sound, (Δu), isentropic compressibility, (k s ), deviation in isentropic compressibility, (Δk s ), and deviation in refractive index, (Δn D ) were generated from the reported experimental data. Some of these derivative properties are fitted using the Redlich−Kister equation. Moreover, the measured data of density are modeled using the perturbed-chain statistical associating fluid theory equation of state. Intermolecular interactions between each binary and ternary mixtures have been discussed.

New measurement density data (1360 points) for dibutyl ether (1) + 1-heptanol (2) + heptane (3) were measured at various temperatures, T (298.15–393.15) K, and various pressures, p (0.1–140) MPa, adopting an Anton-Paar densimeter (DMA HPM). The excess molar volumes, V E, of the studied ternary system were derived from the measured density data. Subsequently, they are calculated with the Singh and Redlich–Kister equations. V E values were employed to obatin the different interactions implied in the mixture. The Peng–Robinson and the perturbed chain-statistical association fluid theory (PC-SAFT) equations of states were performed for their potential to correlate and predict the experimental density for the ternary mixture. The PC-SAFT parameters of pure compounds that constituted the studied ternary mixture were regressed by the measured data of density of each pure compound.