(257ae) Thermodynamic and Spectroscopic Study of Binary Mixtures of (Diethyl Malonate + Butanol) at Different Temperatures and Atmospheric Pressure

Thermodynamics properties of binary and multicomponent liquid mixtures are required in many chemical engineering calculations involving fluid flow, heat and mass transfer. Their derived properties can provide valuable information about molecular interactions and structural effects. In order to support thermodynamics data, spectroscopic studies allow to draw detailed conclusions about the influence of solvents and formation of inter and intramolecular hydrogen bonds. As a continuation of our studies on excess properties of binary liquid mixtures containing alcohols, in this study we report density, speed of sound and viscosity data of binary mixtures of {diethyl malonate (DEM) + butanol}, over the whole composition range, at the temperatures of 288.15, 293.15, 298.15, 303.15 and 308.15 K and atmospheric pressure. The experimental results have been used to calculate the excess molar volume, the isentropic compressibility deviation and the viscosity deviation. The results were correlated using a Redlich-Kister equation. Diethyl malonate (Sigma-Aldrich, purity > 99.7%), butanol (Merck, purity > 99.9%) were used without further purification. The purity of each substance was evaluated by chromatography and the measurements of density, speed of sound and viscosity of pure liquids were compared with the corresponding values available in the literature. The binary mixtures were prepared by weighing the pure components on OHAUS Adventurer (Model AR2140) balance. The densities and speed of sound of pure components and their solutions were measured using a commercial density and speed of sound analyzer manufactured by Anton Paar (Model DSA 5000), whereas the viscosities were determined by using a Stabinger viscosimeter (Model SVM 3000/ G2) manufactured by Anton Paar. FT-IR spectra was recorder using a Thermo Scientific (Model Nicolet 6700) FT-IR, and NMR spectra was registered by means of a Burker (Model Avance III 600 HD) NMR. Excess molar volumes were positive while the viscosity deviation and isentropic compressibility deviation were negative over the entire composition range. Excess molar volume and viscosity deviation increase whereas isentropic compressibility deviation decrease with increasing in temperature. The results obtained were discussed in terms of intermolecular interactions, particularly hydrogen-bonding interactions between like and unlike molecules.