Abstract
The effect from the combined action of a low-frequency acoustic field, a demulsifier (DE), and the temperature factor on the stability of the water-in-oil emulsions formed by crude oils differing in the contents of resins, asphaltenes, and paraffin hydrocarbons was examined. It was shown that the DE acts on the emulsions more effectively after acoustic treatment which accelerates the process of coalescence and separation of free aqueous phase. Preliminary exposure of the emulsion to the physical field facilitates migration of the DE molecules towards the interfacial film and causes loosening of the protective shells around the water droplets, thereby leading to formation of new disperse structures via redistribution of the oil components. An IR-spectroscopic analysis showed that the resin molecules in the emulsion are more susceptible to the acoustic field exposure than the asphaltene molecules, which causes a change in their structural-group composition.
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This study was supported by the Ministry of Science and Higher Education of the Russian Federation within the framework of the State Assignment to the Institute of Petroleum Chemistry, Siberian Branch, Russian Academy of Sciences.
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Loskutova, Y.V., Yudina, N.V. Destruction of a Water-in-Oil Emulsion under Combined Action of a Low-Frequency Acoustic Field and a Demulsifier. Pet. Chem. 62, 506–514 (2022). https://doi.org/10.1134/S0965544122020220
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DOI: https://doi.org/10.1134/S0965544122020220