ABSTRACT
In present study, the asphaltene precipitation was examined through pendant drop method regarding the impacts of oil composition, solvent type and concentration in both atmospheric and elevated pressures. Consequently, it is observed that there is a specific region for solvent concentration, in which the surface activity of nC5 is more than nC7 leading to the lower oil-water interfacial tension of nC5 diluted oil than that of nC7 diluted solutions. By decreasing resin to asphaltene ratio, this region will shift to the lower solvent concentrations. This finding could be of crucial value for analyzing the asphaltene precipitation in petroleum systems.