Electrophoretic Measurements of Crude Oil Fractions Dispersed in Aqueous Solutions of Different Ionic Compositions—Evaluation of the Interfacial Charging Mechanisms

Umer Farooq Ugelstad Laboratory, Department of Chemical Engineering, Norwegian University of Science and Technology (NTNU), Trondheim, Norway; SINTEF Materials and Chemistry, Trondheim, Norway

Sébastien Simon Ugelstad Laboratory, Department of Chemical Engineering, Norwegian University of Science and Technology (NTNU), Trondheim, Norway

Medad T. Tweheyo Statoil R&D Centre, Trondheim, Norway

Johan Sjöblom Ugelstad Laboratory, Department of Chemical Engineering, Norwegian University of Science and Technology (NTNU), Trondheim, Norway

Gisle Øye Ugelstad Laboratory, Department of Chemical Engineering, Norwegian University of Science and Technology (NTNU), Trondheim, NorwayCorrespondence[email protected]

Abstract

Electrophoretic measurements were carried out as a function of pH for various fractions of an acidic crude oil dispersed in pure water and low salinity solutions of NaCl and CaCl₂. The acidic and basic components were selectively extracted from the crude oil in order to elucidate their importance for the interfacial charges and implicitly the zeta potentials. Ionization of basic and acidic components at low and high pH, respectively, could not fully account for the obtained zeta potentials. The results could, however, be explained by additional consideration of interfacial hydroxide ions, coming from the water phase.

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Acknowledgments

VISTA is acknowledged for the financial support.

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Electrophoretic Measurements of Crude Oil Fractions Dispersed in Aqueous Solutions of Different Ionic Compositions—Evaluation of the Interfacial Charging Mechanisms

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Electrophoretic Measurements of Crude Oil Fractions Dispersed in Aqueous Solutions of Different Ionic Compositions—Evaluation of the Interfacial Charging Mechanisms

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