Abstract
Structure of an n-heptane asphaltene obtained from atmospheric residue of crude oil has been analyzed using ultraviolet, infrared, and nuclear magnetic resonance (1H and 13C) spectroscopy and elemental analysis. The molecular weight of asphaltene was deduced by GPC (M n 3372 g · mole−1). Asphaltene exhibited H/C ratio of 0.905 and high sulfur content, being of thioether, thiophene rings or other C-S-C structures. Detailed ultravioletspectra of asphaltene recognized its construction as sets of fused aromatic rings, with each set having an average of three rings, thus, deducing a model structure. The onset point and aggregation behavior of asphaltene have been studied in the presence of alcohols(n-C6OH, n-C7OH, n-C8OH and n-C10OH) versus n-heptane, n-hexane and n-pentane as precipitating agents. The aggregation study has been carried out using dynamic light scattering. N-heptanol and n-hexanol showed the most delaying influence for the asphaltene aggregation versus n-heptane, n-hexane and n-pentane, respectively. Similarly, the aggregation behavior explored by dynamic light scattering showed that the use of n-hexanol and n-heptanol results in aggregate sizes that were smaller than those obtained when using n-octanol and n-decanol.
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