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Asphaltene aggregation in organic solvents.

Kyeongseok Oh1, Terry A Ring, Milind D Deo

  • 1Department of Chemical and Fuels Engineering, University of Utah, 50 S Central Campus Drive, Salt Lake City, UT 84112, USA.

Journal of Colloid and Interface Science
|February 6, 2004
PubMed
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This study introduces critical aggregation concentrations (CACs) for asphaltenes using near-infrared spectroscopy. These concentrations, similar to critical micelle concentrations (CMCs), indicate changes in asphaltene aggregation rates.

Area of Science:

  • Petroleum Geochemistry
  • Colloid and Surface Science

Background:

  • Asphaltenes are complex organic molecules found in crude oil.
  • Understanding asphaltene aggregation is crucial for oil production and processing.
  • Carbon dioxide flooding can induce asphaltene precipitation.

Purpose of the Study:

  • To determine the critical aggregation concentrations (CACs) of asphaltenes using near-infrared (NIR) spectroscopy.
  • To compare CACs with critical micelle concentrations (CMCs) derived from surface tension measurements.
  • To characterize asphaltenes using thermal gravimetric analysis (TGA) and elemental analysis.

Main Methods:

  • Heptane titration to induce asphaltene precipitation.
  • Near-infrared (NIR) spectroscopy to monitor precipitation onset.

Related Experiment Videos

  • Surface tension measurements to determine critical micelle concentrations (CMCs).
  • Thermal gravimetric analysis (TGA) and elemental composition analysis.

    • Main Results:

    • Distinct critical aggregation concentrations (CACs) were observed for asphaltenes in different solvents (toluene, trichloroethylene, tetrahydrofuran, pyridine).
    • CACs were found to be comparable to critical micelle concentrations (CMCs).
    • Heptane-insoluble asphaltenes exhibited a higher H/C ratio and lower molecular weight.

    Conclusions:

    • CACs represent key concentrations where asphaltene aggregation rates change.
    • NIR spectroscopy provides a viable method for determining asphaltene aggregation behavior.
    • Asphaltene properties vary based on their origin and solvent interactions.