Laura Mosteiro

Relative permittivities of binary mixtures of 1-butanol + n-alkane AT 298.15 k

A previous study on the physical properties of 1-alkanol + n-alkane has establised a correlation between dielectric permittivity at 1 GHz and excess molar volumes for all binary systems that were studied. In order to determine whether this behaviour is similar at lower frequencies, relative permittivity was measured at 100 kHz. The refractive index was measured to explore the effects at higher frequencies. Mixtures under study are in particular the systems (1-butanol + n-hexane, or n-octane, or n-decane) at the temperature of 298.15 K and atmospheric pressure, over the entire composition range.

Temperature dependence of volumetric behaviour for methyl tert-butylether+1-butanol system

Excess molar volumes and excess isoentropic compressibilities of methyl tert-butylether (MTBE)+1-butanol at 288.15, 293.15, 298.15, 303.15 and 308.15 K and atmospheric pressure have been studied. In order to analyse the temperature dependence of this mixture, isobaric expansibility a, (dVme dT)P,xand (dHme dP)T,x, were computed by analytical differentiation of the density and excess molar volume fitting equations. Cubic equation of state (Soave-Redlich-Kwong) has been applied to excess molar volume correlation obtaining binary interaction parameters using different mixing rules.

Estimation of carbonate–alcohol interaction parameters for Nitta–Chao group contribution model: application of a Genetic Algorithm

Abstract In this work, the characteristic parameters for the interaction of carbonate–hydroxyl pair for the Nitta–Chao model have been calculated using an updated data base of vapour–liquid equilibria, activity coefficients at infinite dilution, excess molar enthalpies and excess molar volumes of carbonate+1-alkanol binary mixtures. In the process of optimisation of the interaction parameters a Genetic Algorithm (GA) has been used.