Structural Parameters of Asphaltene Fraction of Gujarat Crude Mix using FT-NMR Spectrometry

The Fourier transform nuclear magnetic resonance (cmr and pmr) spectra of asphaltene fraction (nC7 -insoluble) of Gujarat crude mix were recorded at room temperature on a Jeol pulsed FT-NMR (FX- 100) and a Perkin-Elmer R-32 spectrometers respectively. The structural parameters, such as fraction of different types of aromatic carbons, compactness factor and carbonfhydrogen ratio of the asphaltene have been calculated from the relative amount of protonated, bridgehead and substituted carbons in the aromatic region of cmr spectrum and the relative amounts of aromatic and saturated protons in the pmr spectrum. The qualitative details of saturated carbons have also been presented from the saturate region of the cmr spectrum

Hydrocarbon class type distribution of crude oils by high performance liquid chromatography

172-177High performance liquid chromatography (HPLC) provides a rapid analytical technique for chemical group type separation for evaluating crude oils. Seven crude oils of different origins and a technical blend of these crudes were taken up for this study. Crude oils were separated into total saturates and total aromatics on amino bonded silica column through HPLC system using UV and RI detectors. The quantitation of all class types were carried out by applying the response factors of separated concentrates from the technical blend of crude oils and calculating their response factors. The precision and the accuracy of the method was demonstrated by determining the standard deviation for the peak areas using pure compounds and comparison of HPLC procedure with their gravimetric data obtained by open column chromatography on technical blend of crude oils. The method is simple, accurate and provides compound class type analysis with microgram sample and is suitable for quick compositional surveys of crude oils. It uses a single solvent elution, requires minimum sample preparation and the time required for single analysis is less then an hour. Therefore, the method can be adapted for routine analysis of crude oils and streams from various processes. </span

Molecular Fingerprints and Speciation of Crude Oils and Heavy Fractions Revealed by Molecular and Elemental Mass Spectrometry: Keystone between Petroleomics, Metallopetroleomics, and Petrointeractomics

International audiencePetroleum and its fractions are some of the most complex mixtures found in analytical chemistry. Mass spectrometry currently plays an increasing role in the characterization of these matrices. Since the last review on this topic in 2011, several new approaches have been introduced, and these approaches increasingly use sample fractionation by extraction and/or liquid chromatographic techniques. This review considers molecular mass spectrometry (with special emphasis on the use of ion mobility) and inorganic mass spectrometry. The combination of both techniques paves the way to "petrointeractomic" approaches, which are introduced as a novel, important part of "petroleomic" approaches