Asphaltenes as a surface active agent
Conference
·
OSTI ID:229611
- Texaco Research and Development, Beacon, NY (United States)
Asphaltene represents the heavy-end materials of the crude oil, conventionally defined via solvent solubility (either heptane or pentane). Chemically, it consists of polynuclear aromatics with the H/C ratio close to unity. Additionally, it contains a great deal of heteroatoms, such as sulfur, nitrogen, nickel, vanadium, etc. Several experiments have revealed the surface activity of asphaltenes in some selected solvents through measurements of their rheology or critical micelle concentrations in these solvents. The asphaltene micelles were found thermodynamically reversible. In a two phase asphaltene/water system, asphaltenes appear to vary their surface activities depending upon the polarity of the aqueous phase. Our recent experiment further showed that asphaltene/water/toluene may form, water-in-oil emulsion under certain conditions.
- OSTI ID:
- 229611
- Report Number(s):
- CONF-9502114--Vol.2
- Country of Publication:
- United States
- Language:
- English
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