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Solution properties of asphaltenes.

Loïc Barré1, Sébastien Simon, Thierry Palermo

  • 1Institut Français du Pétrole (IFP), 1&4 Avenue du Bois-Préau, 92852 Rueil-Malmaison, France. loic.barre@ifp.fr

Langmuir : the ACS Journal of Surfaces and Colloids
|March 5, 2008
PubMed
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Ultracentrifugation yields asphaltene fractions forming nanometric fractal aggregates. These structures trap solvent, and their viscosity and osmotic moduli align with hard sphere models when using effective volume fractions.

Area of Science:

  • Materials Science
  • Physical Chemistry
  • Colloid Science

Background:

  • Asphaltenes are complex molecules found in crude oil, known for their aggregation behavior.
  • Understanding asphaltene structure-property relationships is crucial for petroleum processing and stability.
  • Previous studies often dealt with polydisperse asphaltene fractions, complicating structural analysis.

Purpose of the Study:

  • To investigate the nanostructure of asphaltene fractions with reduced polydispersity.
  • To correlate structural parameters with solution properties like viscosity and osmotic moduli.
  • To develop a predictive model for asphaltene solution behavior based on aggregate structure.

Main Methods:

  • Preparation of asphaltene fractions using ultracentrifugation.

Related Experiment Videos

  • Characterization via viscosity measurements and small-angle X-ray scattering (SAXS).
  • Analysis of concentration-dependent properties and comparison with theoretical models (flat disc, fractal, hard sphere).

    • Main Results:

    • Asphaltene fractions exhibit reduced polydispersity, enabling detailed structural analysis.
    • A fractal model successfully describes viscosity, radius of gyration, and second virial coefficient dependencies.
    • Asphaltene-toluene solutions form nanometric mass fractal aggregates (fractal dimension ~2.1) that trap solvent.
    • Relative viscosities and reduced osmotic moduli merge onto master curves when using effective volume fractions, consistent with hard sphere behavior.
    • A hydrodynamic-to-gyration radius ratio of 0.6 predicts solution viscosities, aligning with the fractal aggregate model.

    Conclusions:

    • Asphaltene aggregation in solution is best described by a mass fractal model.
    • Effective volume fraction is a key parameter for unifying the behavior of different asphaltene fractions.
    • The fractal structure dictates solution properties, allowing for viscosity prediction based on aggregate characteristics.