A dielectric spectroscopic study of the disperse structure of asphaltene solutions at high pressures
- Gubkin Oil and Gas Institute, Moscow (Russian Federation)
The disperse structure of oil asphaltenes in benzene and toluene solutions at different temperatures and concentrations were studied at pressures up to 1.0 GPa. The polarity of the asphaltene molecules allows the dielectric spectroscopic method to be used. A sharp increase in the relaxation time and the sizes of the asphaltene aggregates, calculated according to the Debye model near the phase transition point, were found in the benzene solution. The pressure value corresponding to crystallization is much higher in the toluene solution, and only the border region can be investigated. An explanation of the pressure dependences of the relaxation times are presented. The activation energies and the coefficients of isothermal compressibility are calculated.
- OSTI ID:
- 83345
- Journal Information:
- Colloid Journal of the Russian Academy of Sciences, Vol. 56, Issue 2; Other Information: PBD: Mar-Apr 1994; TN: Translated from Kolloidnyi Zhurnal; 56: No. 2, 229-234(1994)
- Country of Publication:
- United States
- Language:
- English
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