Abstract
The association behaviors of asphaltene (heptane insoluble fraction) and maltene (heptane soluble fraction) fractionated from Iranian Light (IL) vacuum residue were investigated by measuring the surface tensions of their solutions in quinoline, 1-methylnaphthalene (1-MN), and toluene. Both asphaltene and maltene showed surface activity in quinoline. On the other hand, the surface tension of asphaltene little changed with concentration in 1-MN or toluene. In most systems, some small discontinuities could be observed on the surface tension-log concentration plots, suggesting that stepwise association of asphaltene and maltene components proceeds with increasing concentration.
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