Abstract
Four crude oils of diverse API gravities were distilled on an 801 Autodest, Model 800 distillation unit to obtain vacuum gas-oil (VGO) distillates in the boiling range of 360–525°C. These distillates were separated into acids and bases by anion and cation exchange resins, and neutral nitrogenous compounds were removed by ferric chloride (FeCl 3) on cellulose. Saturates were separated from aromatics by silica-alumina gel chromatography. Characterization of the crude oils and VGO distillates was carried out according to IP and ASTM methods. Nuclear magnetic resonance (NMR) spectroscopy was used successfully to calculate average molecular parameters and to elucidate an average molecular structure of the separated fractions.
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