Thermodynamic properties like excess volume VE m, excess partial volume VE m,i , in isentropic compressibility deviations Δ Ks, and refractive index deviations ΔnD, have been calculated based on experimental density ρ, speed of sound u, and refractive index nD, 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. TheVE m is negative for + 2- propanol and positive sign for other systems observed. The Δ Ks is negative for all systems, except for + 2- heptanol system is positive. The ΔnD 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 VE m data of binary mixtures. The fitting data for all systems reasonable consistency with experimental data for all the systems
