The study of thermodynamic properties of diethylene glycol monoethyl ether with 2-alkanols (C3 − C7) with use of PFP and ERAS modeling

Abstract

Thermodynamic properties like excess volume $V_m^E$, excess partial volume ${\overline{V}}_{m,i}^E,$ in isentropic compressibility deviations Δ $K_s$, and refractive index deviations $\Delta n_D,$ have been calculated based on experimental density ρ, speed of sound u, and refractive index $n_{D,}$ by an Anton Paar / DSA 5000/ densimeter and Anton Paar Abbemat / 500/ refractometer. The systems of diethylene glycol monoethyl ether (DEGEE) + 2-propanol, or + 2-butanol, or + 2-pentanol, or + 2-hexanol, or + 2-heptanol, were given at T = (298.15–318.15) in 10 K intervals at ambient pressure (81.5 kPa) have been investigated. Data was fitted by Redlich-Kister relation.${TheV}_m^E$ is negative for + 2-propanol and positive sign for other systems observed. The Δ $K_s$ is negative for all systems, except for + 2-heptanol system is positive. The $\Delta n_D$ is negative for + 2-hexanol or + 2-heptanol systems and is positive for all the rest. The The intermolecular interactions and structure factors were discussed for the binary mixtures. In addition the Prigogine–Flory–Patterson theory (PFP) and Extended Real Associated Solutions (ERAS) models were used to correlate $V_m^E$ data of binary mixtures. The fitting data for all systems reasonable consistency with experimental data for all the systems.