Compositional studies on hydrocarbon type fraction from deasphalted oils and asphalts by NMR spectrometry

Detailed compositional studies of heavy ends of petroleum are necessary to predict what products to expect in what volume from their conversion, in pr ocesses like Fluid Catalytic Cracking and Hydrocracking. This communication presents the compositional data on hydrocarbon constituents isolated from deasphalted oils and asphaltics of Bombay High and Assam mix crudes employi ng liquid chromatography and NMR spectrometry respectively. In addition to paraffinic and naphthenic carbons, various types of aromatic quarternary ca rbons and number of biaryl linkages were estimated on predominantly polycyc lic structures. These detailed studies of polycyclic structures would furth er help in understanding more fully the chemical changes occurring during c onversion processes.