Structural Transformations of Bitumen Asphaltenes after Ultrasonic Treatment

The aggregation and sedimentation stability of asphaltene solutions in toluene treated in an ultrasonic field (field intensity, 18 W/cm 2 ; frequency, 22 kHz) for 5 and 10 min was examined. To study the microstructure of the supramolecular formations of asphaltenes and the structural group compositi...

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Bibliographic Details
Published inSolid fuel chemistry Vol. 56; no. 2; pp. 133 - 137
Main Authors Volkova, G. I., Morozova, A. V.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.04.2022
Springer Nature B.V
Subjects
Agglomeration
Asphaltenes
Chemistry
Chemistry and Materials Science
Fragments
Physical Chemistry
Sedimentation
Sedimentation & deposition
Stability
Toluene
Ultrasonic processing
ultrasonic treatment
structural group analysis
asphaltenes
sedimentation stability
structural fragments
aggregation stability
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Summary:The aggregation and sedimentation stability of asphaltene solutions in toluene treated in an ultrasonic field (field intensity, 18 W/cm 2 ; frequency, 22 kHz) for 5 and 10 min was examined. To study the microstructure of the supramolecular formations of asphaltenes and the structural group composition of their averaged molecules, asphaltenes were repeatedly isolated from toluene solutions. It was found that the degree of dispersion of asphaltene aggregates and the aggregation and sedimentation stability increased as a result of ultrasonic treatment for 10 min. In this case, the relative concentration of aliphatic fragments and the numbers of rings in the naphthene–aromatic system, heteroatomic structural fragments, and blocks in the average asphaltene molecule decreased.
ISSN:0361-5219
1934-8029
DOI:10.3103/S0361521922020112