Fluorescence rejection in Raman spectra of Syncrude Sweet Blend distillation fractions

These fluorescence rejection methods were applied to two groups of Syncrude Sweet Blend distillation fractions. For light gas oils (boiling range, 195-343 °C) the ratio of monocyclic and bicyclic aromatic species was determined and bands due to aliphatic CHn groups were characterized. Heavy gas oils (343-524 °C) yielded bands that allowed quantitation of monocyclic, bicyclic and total aromatic groups. Bands due to aliphatics were also identified for the heavy gas oils. These results constitute a significant advance compared to the information obtainable using conventional dispersive and FT-Raman spectroscopy for the analysis of hydrocarbon distillation fractions.