Abstract
The supercritical fluid extraction and fractionation method (SFEF) can realize deep cut and separation for heavy oils, which have provided a powerful tool for heavy oil chemistry research. This work summarizes recent research progress on aspects include the association and aggregation, the diffusion phenomena of SFEF cuts, the association and interaction between trace metal species and asphaltene in liquid solvent and supercritical conditions. The molecular level composition changes in supercritical extraction, thermal reaction and hydrotreating processes will also be discussed. The inspiration of the relevant chemical fundamentals to the development of heavy oil multi-stage separation by supercritical fluid processing technologies will be introduced as well.
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