Experimental Study and Modeling Using the PFP Theory and the ERAS Model of the Excess Molar Volume and Isentropic Compressibility of Dimethylbenzylamine with Alkanol Mixtures at Different Temperatures

In the current study, molecular forces in the binary fluids of dimethylbenzylamine and normal alkanols (1-propanol, 1-butanol, 1-pentanol, and 1-hexanol) were studied at 298.15-318.15 K regarding experimental values of density and speed of sound. Negative values of excess molar volume, V-m(E), and isentropic compressibility deviation, Delta kappa(s), were obtained for all binary mixtures. Findings indicate that an increase in alcohol chain length reduces its interaction with dimethylbenzylamine molecules. The ERAS (Extended Real Associated Solutions) model and the PFP (Prigogine-Flory-Patterson) theory were applied to correlate the excess molar volumes, and the outcomes of the two models indicate that for all binary mixtures, the agreement between two sets of data is acceptable. Experimental density and speed of sound for the above binary mixtures have not been reported in the scientific literature yet.