Characteristics of Asphaltene Fractions Responsible for the Formation of Stable Water‑Oil Emulsions

Stable water-oil emulsions are formed due to the strong armor layer at the oil/water interface able to prevent the coalescence of water droplets in oil. The stability of water-oil emulsions obtained by mixing solutions of asphaltene in toluene and in heptol (a mixture of n -heptanol and toluene) wit...

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Published inChemistry and technology of fuels and oils Vol. 59; no. 6; pp. 1162 - 1168
Main Authors Ganeeva, Yu. M., Barskaya, E. E., Okhotnikova, E. S., Gazylzyanova, G. R., Yusupova, T. N., Karabut, Yu. L., Kemalov, R. A.
Format Journal Article
LanguageEnglish
Published New York Springer US 2024
Springer Nature B.V
Subjects
Aggregates
Asphaltenes
Chemistry
Chemistry and Materials Science
Distilled water
Emulsions
Geotechnical Engineering & Applied Earth Sciences
Industrial Chemistry/Chemical Engineering
Mineral Resources
Thin walled shells
Toluene
Water drops
stability of water-oil emulsions
water-oil emulsions
asphaltenes
asphaltene aggregates
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Summary:Stable water-oil emulsions are formed due to the strong armor layer at the oil/water interface able to prevent the coalescence of water droplets in oil. The stability of water-oil emulsions obtained by mixing solutions of asphaltene in toluene and in heptol (a mixture of n -heptanol and toluene) with distilled water was found to be a function of two asphaltene fractions, namely, a fraction soluble in heptol enriched with ester fragments and a fraction tending to form aggregates in heptol. The surfactant properties of the first fraction permit the formation of a thin shell with low mechanical strength at the oil/water interface. The asphaltene aggregates adsorbed onto this thin shell are compacted over time, imparting rigidity and mechanical strength to the oil/water interface layer.
ISSN:0009-3092
1573-8310
DOI:10.1007/s10553-024-01631-y