Abstract
A simple two-step procedure has been developed for the isolation of trace nitrogen compounds remaining after hydrotreatment of shale oil. Open-column alumina chromatography quickly separates saturates plus monoaromatics from poly-aromatics and nitrogen compounds. The nitrogen compounds are then fractionated by preparative high-performance liquid chromatography using an amino bonded-phase column. Individual compounds may then be resolved and identified by gas chromatography—mass spectrometry. The procedure has been applied to whole hydrotreated shale oils prepared using catalysts of different activity and to four distillation fractions of a hydrotreated shale oil.
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