Application of the extended real associated solution (ERAS) theory to excess molar enthalpies of benzaldehyde + 1-alkanols (C1 to C5) at T = 298.15 K

Abstract

This paper reports excess molar enthalpies, HmE, for the binary mixtures of {1-alkanols (2), namely, {methanol, ethanol, 1-propanol, 1-butanol, and 1-pentanol} with benzaldehyde (1)} at T=298.15K at ambient pressure over a whole range of mole fraction. The sign of HmE for all systems are positive and the magnitude of HmE values with increasing of chain length, increase. The Redlich–Kister polynomial equation was used to correlate HmE. The excess partial molar enthalpies of benzaldehyde, Hm,1E, excess partial molar enthalpies of 1-alkanols (C1 to C5), Hm,2E, and excess partial molar enthalpies at infinite dilution, Hm,iE,0, are calculated according to experimental excess molar enthalpies and Redlich–Kister polynomial equation. The extracted date were used to evaluated the so-called intermolecular interaction functions ∂Hm,iE/∂xi and ∂Hm,iE/∂xj in terms of enthalpy. The ERAS, Wilson and NRTL models have been applied for describing the HmE.