Transport Properties and Modeling of Viscosity for Binary Mixtures of Butanol Isomers plus Hydrocarbons

As butanol would be the potential oxygenates, viscosity of twelve binary systems of butanol isomers with hydrocarbons (cyclohexane or benzene or toluene) was measured with Ubbelohde viscometer over the entire range of composition at 308.15 K. The calculated viscosity deviation values were fitted to Redlich-Kister polynomial. The deviations in viscosity were coupled with previously reported excess molar volume data in order to study the intermolecular interaction in these binary mixtures with one associated component. This approach was proposed for the viscosity of binary mixtures with self-associating component and here applied on butanol + cyclohexane or benzene or toluene mixtures at 308.15 K. It was suggested that depolymerization power of aromatic hydrocarbon toward isomers of butanol as well as strength of intermolecular interactions (electron donor-acceptor type) between monomer of butanol and aromatics depends on pi-electron density of aromatic hydrocarbon. The viscosity of these binary mixtures was also correlated by Grunberg-Nissan, Tamura-Kurata, Hind-McLaughlin-Ubbelohde and Katti-Chaudhari correlations. It was found that the viscosity of these binary mixtures was best predicted by Grunberg-Nissan correlation except for n-butanol + cyclohexane or toluene and tert-butanol + benzene mixtures.