13C n.m.r. and multivariate statistical analysis of adsorbed surface-active crude oil fractions and the corresponding crude oils

Six crude oils from the North Sea and the corresponding silica-adsorbed fractions are analysed by 13C nuclear magnetic resonance spectroscopy and subsequent principal component analysis. Solvent shifts, integrals and peak heights are used as input in the principal component analysis. The silica-adso...

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Bibliographic Details
Published in:Fuel (Guildford) 1992-07, Vol.71 (7), p.739-746
Main Authors: Urdahl, Olav, Brekke, Trond, Sjöblom, Johan
Format: Article
Language:English
Subjects:
13C n.m.r
Applied sciences
Constitution and properties of crude oils, shale oils, natural gas and bitumens. Analysis and characteristics
crude oil
Crude oil, natural gas and petroleum products
Energy
Exact sciences and technology
fraction
Fuels
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Summary:Six crude oils from the North Sea and the corresponding silica-adsorbed fractions are analysed by 13C nuclear magnetic resonance spectroscopy and subsequent principal component analysis. Solvent shifts, integrals and peak heights are used as input in the principal component analysis. The silica-adsorbed fractions are enriched in condensed aromatics relative to the crudes. The individual crudes vary from being relatively naphthenic/aromatic to relatively paraffinic. The principal component loadings for the peak heights strongly indicate the presence of a long straight chain aliphatic compound containing a heteroatom substituent. The compound is particularly abundant in the paraffinic oils. It is believed that it may be active in the formation of stable water-in-crude oil emulsions.
ISSN:0016-2361
1873-7153
DOI:10.1016/0016-2361(92)90122-5