Abstract
The aim of this study was to get an atomic mass balance on nitrogen compounds in petroleum fractions such as crude oils, distillation cuts, or rock extracts. Two methods have been developed for the separation of basic compounds: a liquid−solid extraction on a commercial acid-bound silica and a new technique by liquid−liquid extraction. Both methods allowed for a selective and quantitative recovery of the basic compounds. For neutral nitrogen species, a method is proposed based on deprotonation by a strong base and liquid−liquid extraction. The efficiency of the three methods was checked on appropriate standards. These techniques were then applied to a crude oil from the Middle East and its distillation cut 375−550 °C. All the basic and neutral fractions were submitted to elemental analyses in order to get the total nitrogen balance to be compared to the initial amount present in the crude oil. Results show that a large part of nitrogen is contained in the residue of the oil distillation above 550 °C. The...
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