Asphaltene self-association

被引:54
作者
Yarranton, HW [1 ]
机构
[1] Univ Calgary, Dept Chem & Petr Engn, Calgary, AB T2N 1NA, Canada
关键词
asphaltenes; resins; colloid; polymer; micelle; vapor pressure osmometry; gel permeation chromatography; molar mass;
D O I
10.1081/DIS-200040234
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
Recent characterizations of asphaltene structures suggest that asphaltene monomers may consist of several small polynuclear aromatic clusters linked by alkyl chains and containing a variety of heteroatoms. This structure lends itself to the view that asphaltenes self-associate in a manner analogous to oligimerization rather than simple stacking. If asphaltenes are assumed to be oligimers, some of the interesting features of asphaltene behavior can be explained in a self-consistent approach, including: measured changes of asphaltene molar mass in different solvents and at different temperatures; the precipitation of asphaltenes from alkane-diluted heavy oils; and the interfacial behavior of asphaltenes. Recent work in these areas indicates that asphaltene monomers are in the order of 1000 to 2000g/mol and that self-associated asphaltenes consist of two to six monomers per aggregate on average.
引用
收藏
页码:5 / 8
页数:4
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