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Asphaltene Adsorption on Functionalized Solids.

Henri-Louis Girard1, Philippe Bourrianne1, Dayong Chen2

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Asphaltene adsorption on surfaces is complex. Substrate properties significantly influence adsorption kinetics, orientation, and packing density, impacting oil recovery and pipe flow.

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Area of Science:

  • Petroleum Geochemistry
  • Surface Science
  • Colloid and Interface Science

Background:

  • Asphaltenes are complex heavy aromatic compounds in crude oil.
  • Asphaltene adsorption on surfaces can cause operational issues like pipe clogging and reduced oil recovery.
  • Understanding asphaltene-surface interactions is crucial for optimizing oil production and transport.

Purpose of the Study:

  • To investigate how substrate physicochemical properties affect asphaltene adsorption.
  • To elucidate the mechanisms and kinetics of asphaltene deposition on various surfaces.
  • To correlate surface properties with asphaltene adsorption behavior.

Main Methods:

  • Wetting measurements to assess initial deposition kinetics and interfacial energy.
  • Quartz crystal microbalance and ellipsometry for long-term adsorption dynamics.
  • Force spectroscopy to study adsorption mechanism and morphology as a function of surface chemistry.

Main Results:

  • Different substrate functionalizations lead to distinct asphaltene adsorption regimes.
  • Alkane substrates slow down initial monolayer formation.
  • Fluorinated surfaces show rapid adsorption with weak bonding, while hydroxyl surfaces promote different orientations and dense packing.

Conclusions:

  • Substrate surface chemistry is a key determinant of asphaltene adsorption behavior.
  • Tailoring surface properties can control asphaltene deposition, potentially mitigating operational problems.
  • The findings provide insights into managing asphaltene-related challenges in the oil industry.