Densities and Refractive Indices of Binary Mixtures of Olive Oil + Alkanols at 298.15 K

Abstract

Densities and refractive indices of mixing of olive oil with the alkanols: methanol, ethanol, 1-propanol, 2-propanol and 1-butanol, have been measured as a function of the composition at T = 298.15 K. Excess molar volumes, $$ V_{\text{m}}^{\text{E}} $$ , and deviation in refractive index, Δn D, were calculated and correlated by a Redlich–Kister type function, to derive the coefficients and estimate the standard error. For mixtures of olive oil with alkanols, $$ V_{\text{m}}^{\text{E}} $$ is positive, except with ethanol and methanol where a sigmoidal variation is observed. Δn D is positive over the entire range of mole fraction. The effect of chain length of the alkanols on the excess molar volumes and deviation in refractive index of the mixtures with olive oil are discussed.