Abstract
Asphaltenes obtained from raw vacuum residue from Russian (Ural) petroleum have been characterized by means of elemental analysis and 1H proton nuclear magnetic resonance (NMR) and compared with asphaltenes separated from the residue desulfurized in the H-oil process. The latter have much lower molecular weight and more aromatic character. In high-temperature conditions of fractionation of the whole H-oil product and in the presence of catalyst dust carried away from reactors, asphaltenes tend to condense, dehydrogenate, and separate from the desulfurized oil as a coke-like sediment. Some correlations have been found between the asphaltene contents of raw and desulfurized residue and the tendency of sediment formation in desulfurized residual oil that causes serious operating problems in H-oil units.
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