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The infra-red spectra of three Chinese vacuum residua and their SARA fractions, together with their average chemical structure parameters obtained from elementary analyses, molecular weight determination and 1 H NMR measurement, have been employed to elucidate, to some extent, how the colloidally dispersed mixed asphaltenes-heavier resins clusters in the three typical Chinese petroleum vacuum...
Transmission electron micrographs obtained with the freeze-fracture replication technique on three typical Chinese vacuum residues and their fractions demonstrate that petroleum vacuum residues are colloidal systems, in which asphaltenes (the n-heptane-insoluble, toluene-soluble fraction) and heavier resins constitute the dispersed phases and the remaining lighter resins, aromatics and saturates the...
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