THE INFLUENCE OF THE SOLVENT MEDIUM ON THE AGGREGATION OF ASPHALTENE MACROMOLECULES AND DETERMINATION OF THEIR MOLAR MASS

被引：0
|
作者：
Middea, Antonieta [1 ]
de Mello Monte, Marisa Bezerra [2 ]
Lucas, Elizabete Fernandes [1 ]
机构：
[1] Univ Fed Rio de Janeiro, Inst Macromol, Rio De Janeiro, Brazil
[2] Mineral Technol Ctr CETEM, Ilha Do Fundro, RJ, Brazil
来源：
CHEMISTRY & CHEMICAL TECHNOLOGY | 2008年 / 2卷 / 02期
关键词：
crude oil; asphaltenes; aggregation; viscosity; interfacial tension; molar mass;
D O I：
暂无
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The formation of aggregates of a fraction of asphaltenes extracted from Brazilian crude oil was investigated by measuring the interfacial tension and kinematic viscosity of their solutions prepared in different solvents. The interfacial tension results indicate the existence of critical micelle concentration (CMC) levels of the asphaltenes in solvents with solubility parameters sufficiently different from those of the asphaltene tested. The kinematic viscosity measures revealed the formation of aggregates at concentrations above the CMC. The interfacial tension measures of asphaltenes in organic solutions, although infrequently mentioned in the literature, were used to calculate the molar mass, permitting the comparison of various molar masses attributed to the asphaltenes in the form of aggregates.
引用
收藏
页码：91 / 97
页数：7
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