Viscosity measurement and correlation research of one biodiesel component (methyl octanoate) with five 1-alcohols

Alcohols are commonly used as additives in biodiesel to improve its viscous and dense properties for better applicability in the industrial field. In this work, experimental investigations are conducted on the dynamic viscosities for the binary mixture of methyl octanoate (one component of biodiesel) with one 1-alcohol containing 1-propanol, 1-butanol, 1-pentanol, 1-hexanol, and 1-heptanol from 293.15 to 333.15 K at atmospheric pressure. The excessive viscosity shows negative deviation from the ideal solution for each binary system and is fitted with the Redlich-Kister equation. The McAllister three-body model is used for the kinematic viscosity correlation of binary mixtures. To acquire dynamic viscosity, the experimental density is measured and correlated as a function of temperature and mole fraction of methyl octanoate. Meanwhile, the McAllister three-body model, Heric's model, Frenkel model, and Grunberg-Nissan model are used to correlate the viscosities of the mixtures. Furthermore, some research has also been done on the improvement of the prediction performance for McAllister three-body model based on the studied systems.