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Colloidal Properties of Asphaltenes in Organic Solvents

  • Eric Y. Sheu
  • David A. Storm

Abstract

Asphaltene is a component of the petroleum liquids defined operationally. It represents the most refractory (or the heaviest) fraction. A generally accepted definition of asphaltenes is by their solvent solubility. The fraction insoluble in heptane (or pentane) but soluble in toluene is called asphaltene [1]. This fraction usually has high apparent molecular weight (often measured by vapor pressure osmometry, VPO). Because it is very refractory, asphaltenes cannot be refined with currently technology. Thus, in many vacuum residua, asphaltene is the main component. In addition to the non-refinerable nature, asphaltene has been known to initiate wellbore plugging, pipeline deposition; hinder the refining yields, and initiate coking, et cetera. Such hinderance on production and processing have made asphaltene one of the most focused materials in petroleum research. The ultimate goal is to either separate asphaltene from the petroleum liquids before entering the refining processes or “upgrade” it to a less refractory (or lighter) fraction. For both cases, one needs to understand the fundamental chemistry of asphaltene.

Keywords

Critical miceBar Concentration Small Angle Neutron Scattering Dynamic Surface Tension Colloidal Property Unit Particle 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1995

Authors and Affiliations

  • Eric Y. Sheu
    • 1
  • David A. Storm
    • 1
  1. 1.Texaco Research and DevelopmentBeaconUSA

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