Abstract
Abstract A new separation scheme has been developed to concentrate nickel and vanadium complexes in selected fractions before attempting a molecular characterization of these organometallic species in heavy crude oils. It involves a combination of solubility- (n-heptane deasphalting and pyridine/water extraction of asphaltenes) and polarity- (S03-modined silica gel column) based steps The proposed method has been applied to Belayim crude oil.The nature of pyridine/water extract from asphaltenes has been investigated using both preparative gel permeation chromatography (GPC) and reverse phase liquid chromatography (RP-HPLC) combined (off-line) to graphite furnace atomic absorption (GFAA). The fractions obtained after the separation of the extract on a S03-modified silica gel column have been submitted to a series of analytical techniques such as GFAA, mass spectrometry using fast atom bombardment lionization technique (MS-FAB),UV-VIS spectroscopy and electron paramagnetic resonance (EPR) All the analytical...
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