Abstract

The aggregation and sedimentation stability of asphaltene solutions in toluene treated in an ultrasonic field (field intensity, 18 W/cm²; 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.

中文翻译：

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超声处理后沥青质的结构转变

摘要

检测了在超声波场（场强，18 W/cm ²；频率，22 kHz）中处理 5 分钟和 10 分钟的甲苯中沥青质溶液的聚集和沉降稳定性。为了研究沥青质超分子结构的微观结构及其平均分子的结构基团组成，反复从甲苯溶液中分离出沥青质。结果表明，超声处理10 min后，沥青质集料的分散程度和聚集沉降稳定性均有所提高。在这种情况下，脂肪族碎片的相对浓度和环烷烃-芳烃体系中的环数、杂原子结构碎片和平均沥青质分子中的块的数量减少了。