Ultrasonic treatment conditions on the properties of emulsions

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The influence of ultrasonic treatment modes on microstructure and structural-rheological properties of emulsions of oils with distilled and formation water was investigated. Emulsions were treated in ultrasonic field (frequency 22 kHz, intensity 2, 6 and 18 W/cm2). The microstructure of emulsions was studied using an optical microscope AXIO LAB.A1 (Carl Zeiss, Germany). The dispersion analysis of emulsion micrographs was carried out and the influence of processing conditions, type of dispersed phase on the average particle size, dispersibility and position of the maximum of the size distribution of water droplets in the emulsion was revealed. Rheological parameters of emulsions before and after ultrasonic treatment were studied using HAAKE Viscotester iQ rotational viscometer (ThermoScientific, USA). For high-viscosity oil with high content of resinous-asphaltene components after ultrasonic treatment in pulse mode at field intensity of 6 W/cm2 and 2 modes (5 cycles with 10 s of operation and 10 s of pause; 10 cycles with 5 s of operation and 5 s of pause) a decrease in the degree of dispersibility of water droplets was observed.

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Sobre autores

G. Volkova

FGBUN Institute of Petroleum Chemistry SB RAS

Autor responsável pela correspondência
Email: galivvol@yandex.ru
Rússia, 634055 Tomsk

E. Smirnova

FGBUN Institute of Petroleum Chemistry SB RAS

Email: smirnova.chemtsu@gmail.com
Rússia, 634055 Tomsk

Bibliografia

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2. Fig. 1. Differential curves of water droplet size distribution after short-term ultrasonic treatment of oil emulsion UN with an intensity of 6 (a) and 18 (b) W/cm2.

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3. Fig. 2. Differential curves of water droplet size distribution after pulsed ultrasonic treatment of UN oil emulsion with formation water: 6 (a) and 18 (b) W/cm2.

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4. Fig. 3. Micrographs of emulsion with PV after ultrasonic treatment with a field intensity of 6 and 18 W/cm2.

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5. Fig. 4. Effect of the ultrasonic treatment time on the viscosity of the emulsion with PV in the absence of resonance at an intensity of 18 W/cm2.

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6. Fig. 5. Effect of the UZO mode on the viscosity of the emulsion with PV in the absence of resonance at an intensity of 18 W/cm2.

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7. Fig. 6. Effect of ultrasound intensity on the viscosity of emulsion with PV after pulse treatment 5 (5 × 5).

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8. Fig. 7. Rheological curves of VNE with SK oil after UZO: (a) – forward and reverse flow curves, (b) – dependence of viscosity on the shear rate of VNE treated for 5 min at 6 and 18 W/cm2.

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9. Fig. 8. Differential curves of water droplet size distribution after ultrasonic treatment of SK oil emulsion at 18 W/cm2.

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10. Fig. 9. Micrographs of SK oil emulsion.

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