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

Thermodynamic properties like excess volume V-m(E), excess partial volume V-m,V-i<overline>(E), in isentropic compressibility deviations Delta K-s, and refractive index deviations Delta n(D), have been calculated based on experimental density rho, 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 Delta 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.