Water-in-hydrocarbon emulsions stabilized by asphaltenes at low concentrations

被引:254
作者
Yarranton, HW [1 ]
Hussein, H
Masliyah, JH
机构
[1] Univ Calgary, Dept Chem & Petr Engn, Calgary, AB T2N 1N4, Canada
[2] Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 2G6, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
asphaltenes; emulsions; water-in-oil; stability;
D O I
10.1006/jcis.2000.6938
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The role of Athabasca asphaltene particles and molecules in stabilizing emulsions was examined by measuring the surface area of water-in-toluene/hexane emulsions stabilized by various asphaltene fractions, each with a different proportion of soluble and insoluble asphaltenes. The stabilized interfacial area was found to depend only on the amount of soluble asphaltenes. Furthermore, the amount of asphaltenes on the interface was consistent with molecular monolayer coverage. Hence, at low concentrations, asphaltenes appear to both act as a molecular surfactant and stabilize emulsions. The effect of the hexane : toluene ratio on emulsion stability was examined as well. At lower hexane:toluene ratios, more asphaltenes were soluble but the surface activity of a given asphaltene molecule was reduced. The two effects oppose each other but, in general, a smaller fraction of asphaltenes appeared to stabilize emulsions at lower hexane:toluene ratios. The results imply that the emulsifying Capacity of asphaltenes is reduced but not eliminated in better solvents. (C) 2000 Academic Press.
引用
收藏
页码:52 / 63
页数:12
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