Prediction of density and refractive index in furfural plus lubricating oil systems

摘要

Lubricating oil cuts are obtained by vacuum distillation of residues followed by a series of refining processes, such as aromatic removal. The aromatic content of vacuum distillates is reduced by solvent extraction, usually with furfural. Among the different properties of lubricating oils, density and refractive index are key to determine their final quality. In this work, density (D-20) and refractive index (n(20)) at 20 degrees C of lubricating oil mixtures were determined from a pseudo-component characterization of the fluid using mixing rules. For that purpose, correlations between these properties and the average boiling point of the feedstock (T-50%) were determined. These correlations were applied to different feedstock, thus obtaining the corresponding pseudo-component D-20 and n(20) values. Finally, D-20 and n(20) of the studied mixtures were calculated by using mixing rules relating pseudo-component properties and composition of samples.