Solubility/Molecular Structure Relationships of Asphaltenes in Polar and Nonpolar Media

Solubility/Molecular Structure Relationships of Asphaltenes in Polar and Nonpolar Media

Asphaltenes separated from a Maya type of crude oil were suspended in toluene and later fractionated by solubility in a polar (acetone) and a nonpolar (n-heptane) precipitating solvent. The two sets of derived fractions were characterized using size exclusion chromatography (SEC), elemental analysis...

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Veröffentlicht in:Energy & fuels 2002-05, Vol.16 (3), p.732-741
Hauptverfasser: Buenrostro-Gonzalez, E, Andersen, S. I, Garcia-Martinez, J. A, Lira-Galeana, C
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Sprache:eng
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Applied sciences
Constitution and properties of crude oils, shale oils, natural gas and bitumens. Analysis and characteristics
Crude oil, natural gas and petroleum products
Energy
Exact sciences and technology
Fuels
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container_issue 3
container_start_page 732
container_title Energy & fuels
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creator Buenrostro-Gonzalez, E
Andersen, S. I
Garcia-Martinez, J. A
Lira-Galeana, C
description Asphaltenes separated from a Maya type of crude oil were suspended in toluene and later fractionated by solubility in a polar (acetone) and a nonpolar (n-heptane) precipitating solvent. The two sets of derived fractions were characterized using size exclusion chromatography (SEC), elemental analysis, Fourier transform infrared spectroscopy (FTIR), and synchronous fluorescence spectroscopy and proton nuclear magnetic resonance (1H NMR) spectroscopy. The results show that the acetone-precipitated asphaltene fractions have larger structural differences compared with those of n-heptane. The average size of the aromatic and aliphatic-substitutions regions of each fraction was also found to correlate with asphaltene solubility in such a way that the smaller the aromatic region and the larger the aliphatic substitutions, the greater the solubility. These correlations may provide further explanations as to the role of structural properties on the solubility of asphaltenes in polar and nonpolar media.
doi_str_mv 10.1021/ef0102317
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The average size of the aromatic and aliphatic-substitutions regions of each fraction was also found to correlate with asphaltene solubility in such a way that the smaller the aromatic region and the larger the aliphatic substitutions, the greater the solubility. These correlations may provide further explanations as to the role of structural properties on the solubility of asphaltenes in polar and nonpolar media.</description><identifier>ISSN: 0887-0624</identifier><identifier>EISSN: 1520-5029</identifier><identifier>DOI: 10.1021/ef0102317</identifier><identifier>CODEN: ENFUEM</identifier><language>eng</language><publisher>Washington, DC: American Chemical Society</publisher><subject>Applied sciences ; Constitution and properties of crude oils, shale oils, natural gas and bitumens. 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subjects Applied sciences
Constitution and properties of crude oils, shale oils, natural gas and bitumens. Analysis and characteristics
Crude oil, natural gas and petroleum products
Energy
Exact sciences and technology
Fuels
title Solubility/Molecular Structure Relationships of Asphaltenes in Polar and Nonpolar Media
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