COMPOSITIONS AND STRUCTURES OF DIFFERENT ASPHALTENES IN TAHE ATMOSPHERIC RESIDUE

Abstract

Abstract: The samples of C5-As, C6-As and C7-As asphaltene were separated from the Tahe atmospheric residue (THAR) by n-pentane, n-hexane and n-heptane solvent, respectively. The surface morphology, crystal structure, functional groups and pyrolysis performance of samples were characterized by SEM, XRD, FT-IR and TG-DTG techniques. The results showed that with increase of solvent carbon chain length, the yield of C5-As, C6-As and C7-As becomes 33.57 %, 26.98 % and 21.12 %, respectively; the surface of three samples were gradually more rough, the particle size decreases; the layer number of aromatic ring and aromatization degree in the molecular structure cell are increased; aromatic ring substitution decreases and condensation extent increases; the thermal stability and the residual carbon of the samples are increased.

Key words: residual oil, asphaltene, structural parameter

CLC Number:

References

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