Densities and Viscosities for Binary Liquid Mixtures of n-Aldehydes + Ethanol from 283.15 to 343.15 K at 0.1 MPa

Abstract

This work reports densities and viscosities of four binary mixtures of aldehydes (C7–C10) + ethanol from 283.15 to 343.15 K at 0.1 MPa. A vibrating tube densimeter is used to measure the experimental densities, while a rolling ball microviscometer measures the dynamic viscosity. Excess molar volumes and viscosity deviations are calculated from the experimental densities and viscosities, respectively. Excess molar volumes show negative deviations, while viscosity deviations are positive. The behavior of these derived properties reflects the formation of hemiacetals by the interaction of the carbonyl and the hydroxyl group as reported in the literature. The aldehyde–alcohol interaction becomes weaker as the temperature rises, reflected in the data behavior. A Redlich–Kister equation is used to correlate both the excess molar volume and the viscosity deviation, within average absolute percentage deviations of 2.738 and 5.928%, respectively. Kinematic viscosities are correlated using the three-body and four-body McAllister equations and the Nava-Ríos equation. The average absolute percentage deviations from the experimental measurements are 2.07, 0.99, and 1.22%, respectively.