Intermolecular interactions in binary mixtures of 2-diethylethanolamine with 1-propanol and 1-butanol at different temperatures

The densities, ρ and ultrasonic speeds, u of binary mixtures of 2-diethylethanolamine (2-DEEA) with 1-propanol and 1-butanol, including those of pure liquids, are measured at 293.15, 303.15 and 313.15 K, over the entire composition range. From the experimental values of ρ and u, molar volume, Vm, isentropic compressibility, κs, acoustic impedance, Z, excess molar volume, VmE, excess ultrasonic velocity, uE, excess acoustic impedance, ZE, excess isentropic compressibility, κSE and excess molar isentropic compressibility, Ks,mE are calculated. Further, the partial molar isentropic compressibility K¯s,m,1 and K¯s,m,2, and excess partial molar isentropic compressibility K¯s,m,1E and K¯s,m,2E over the entire composition range, the partial molar isentropic compressibility K¯s,m,10 and K¯s,m,20, and excess partial molar isentropic compressibility K¯s,m,10E and K¯s,m,20E of the individual components at infinite dilution are also deduced. The variations of the consequent parameters indicate the presence of specific intermolecular interactions between the binary liquid systems. The infrared spectra are also recorded at room temperature (293.15 K).