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Experimental measurement of the mass distribution of petroleum asphaltene aggregates using ultracentrifugation and small-angle X-ray scattering

✍ Scribed by D. Fenistein; L. Barré

Publisher: Elsevier Science
Year: 2001
Tongue: English
Weight: 165 KB
Volume: 80
Category: Article
ISSN: 0016-2361
DOI: 10.1016/s0016-2361(00)00072-7

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✦ Synopsis

Fractionation of petroleum asphaltene in toluene has been carried out using ultracentrifugation. The separated asphaltenes are examined by small-angle X-ray scattering (SAXS). The radii of gyration and molar mass of the separated asphaltenes range over a wide scale that provides a good indication of the self-similar structure of asphaltene aggregates. The relations between mass and radius of gyration M G R D G and between scattered intensity and wave vector Iq G q 2d were studied. Values of both D ( 1.99) and d ( 2.06) show a fractal dimension D f of the asphaltene structure close to 2. The mass distribution of these aggregates can be calculated from the knowledge of both the quantity of separated fractions and the mass M of every fraction. We found experimentally a mass distribution with a power-law shape NM G M 2t with exponent t 1:66. The fractal dimension values and the mass distributions of asphaltene aggregates are similar to those predicted by the RLCA model.

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