Regarding the effect that different twin-tailed surfactant have on a solid stabilized petroleum emulsion |
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Authors: | Paula V Messina Olga Pieroni Valeria Verdinelli Pablo C Schulz |
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Institution: | (1) Departamento de Química, Universidad Nacional del Sur, (8000) Bahía Blanca, Argentina |
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Abstract: | An industrial petroleum emulsion stabilized by colloidal silica particles was treated with four different twin-tailed surfactants:
sodium bis-2-(ethylhexyl) sulfosuccinate (AOT), didodecylammonium bromide (DDAB), calcium oleate (Ca(OL)2), and dioctadecyldimethylammonium bromide (DODAB). Fourier transform infrared (FT-IR) spectroscopy, optical microscopy, centrifuge
test, and conductivity measurement were employed to determine the effect of the amphiphile molecules on the crude oil emulsion.
AOT and DDAB produce emulsion breakdown, while Ca(OL)2 does not alter the emulsion stability and DODAB produces an extra stabilization of it. The AOT adsorption at the oil–water
droplet interface is a spontaneous process (ΔHads < 0), which promoted the emulsion breakdown through an inter-droplet interaction mechanism. DDAB needs extra energy (via
centrifugation) to destabilize the emulsion. Ca(OL)2 dissolves in oil phase and remains there without altering the emulsion strength, while DODAB increases the emulsion stability. |
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Keywords: | Solid stabilized emulsion AOT Twin-tailed surfactants Demulsification Inter-droplet interaction mechanisms |
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