COMPOSITIONAL DIFFERENCES BETWEEN SUPERCRITICAL FLUID EXTRACT AND SHORT-PATH DISTILLATES OF PETROLEUM SHORT RESIDUE

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Abstract
Short-path distillation (SPD) and supercritical fluid extraction (SFE) procedures were employed to obtain portions of a short residue (500°C+). The physicochemical and compositional data of SF extract and SP distillates at four wall temperatures were obtained employing various analytical techniques such as vapour pressure osmometry, simulated distillation, infrared and mass spectrometry. The comparison of these data reveals that although the yield of SF extract is small under the present experimental conditions, it contains relatively higher concentrations of paraffins and alkylbenzenes as compared to SP distillates. The hydro carbon type distribution of distillates was found to be the same, independent of the wall temperature used. The comparison of overall composition of SF extract and SP distillates depicts that former is more suitable to be used as lube stocks.