Analysis of Crude Oils by Frequency Domain Spectroscopy—Effect of Composition and Physical Properties on Conductivity and Dielectric Response

Autor: Andreas Hannisdal, Sébastien Simon, Dag Lihnjell, Lars E. Lundgaard, Øyvind Spets, Cédric Lesaint, Heléne Vrålstad, Johan Sjöblom
Rok vydání: 2011
Předmět:
Zdroj: Journal of Dispersion Science and Technology. 32:874-880
ISSN: 1532-2351
0193-2691
DOI: 10.1080/01932691.2010.488461
Popis: The dielectric properties and the composition of fourteen light to heavy crude oils have been analyzed. Frequency domain spectroscopy (FDS) has been used in order to determine their dielectric response in the frequency range 0.01 to 1000 Hz. For all the crude oils, over the whole frequency range under study, dielectric loss, ϵ″, shows a linear dependence of frequency indicating a pure direct current (DC) conductivity. As temperature is gradually increased, the dielectric loss, ϵ″, increases as well, showing a strong temperature dependence. The storage modulus, ϵ′, shows an explicit behaviour at low frequency that could be due to adsorption of oil components onto the electrodes. We tried to correlate some physical and chemical properties (density, viscosity, SARA, TAN, water content) of the studied crude oils with their conductivity measured at various temperatures. No correlation was found and different hypothesis are suggested by the authors to explain this phenomenon.
Databáze: OpenAIRE
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