Heavy Petroleum Composition. 4. Asphaltene Compositional Space

Asphaltenes and maltenes are defined operationally by solubility (in, e.g., heptane). Asphaltenes self-associate in solution and form putative nanoaggregates composed of approximately 6–10 asphaltene monomers per subunit. Bulk measurements indicate that asphaltenes are more aromatic than maltenes and contain more heteroatoms and metals (nitrogen, sulfur, oxygen, nickel, and vanadium). Numerous direct imaging, molecular diffusion, and mass spectral results agree that asphaltenes and maltenes are defined by similar, overlapped carbon number ranges, drastically restricting the acceptable carbon number and aromaticity “compositional space” for asphaltene compounds. Thus, when viewed by a plot of aromaticity versus carbon number for a given heteroatom class, asphaltenes must occupy different compositional space than maltenes because they share the same carbon number range but differ in bulk aromaticity and solution phase behavior. Boduszynski’s work supported overlapping asphaltene/maltene molecular weights, a...

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