NMR STRUCTURAL-GROUP CHARACTERISTICS AND DETAILED SHIFT RANGES IN LIGHT, HEAVY AND CATALYZED OILS

Application of high resolution 13C nuclear magnetic resonance (NMR) spectroscopy to characterize of light, heavy and catalyzed oils was demonstrated. Molar fractions of primary, secondary, quaternary, tertiary, aromatic groups, aromatic factor and average hydrocarbon chain length of aliphatic hydrocarbons of these oil samples according to 13C NMR spectra were determined. The received parameters indicate about the success of the catalytic treatment of the studied heavy oil sample. The detailed assignment of the 13C NMR signals and their comparison between light, heavy and catalyzed oil samples were carried out. Changes in the chemical shifts of the 13C NMR signals upon a detailed study of the spectra also confirm the positive effect of catalytic treatment of studied sample