Solution behavior of asphaltic residues and deasphalted oil prepared by extraction of heavy oil

- Heavy petroleum was fractionated into solid and liquid with propane at HT-Hp.
- Components with functional groups predominate in solid residue.
- The solid residue contains heptane, hexane and pentane-soluble components.
- The deasphalted liquid extract from crude still presents a relatively high viscosity.
- Petroleum viscosity depends on other polar compounds not included in asphaltenes.