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

Abstract

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