9 research outputs found
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.
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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