Abstract
Precipitation of asphaltenes by alkane solvents from the Qaiyarah heavy crude oil resulted in relatively higher yields under both cooling and solvent reflux temperature conditions as compared to room temperature. Resins occlusion in the cold precipitation conditions is suggested. From detailed elemental analysis, molecular weight and spectroscopic measurements, it is suggested that at reflux temperatures a rearrangement of the asphaltene moeity takes place through molecular degradation followed by a reaction with resins to form new modified asphaltic materials. A typical light crude oil behaved differently, the asphaltene yield increasing continuously with temperature of precipitation.
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