The asphaltene substances of methane-naphthenic and naphthenic-aromatic oils are characterized via methods of extraction, adsorption chromatography, IR and NMR spectroscopy, and chromatography-mass spectrometry. The data on the composition of their high-molecular components and compounds adsorbed/occluded by molecules of asphaltenes are represented. The role of nitrogenous compounds in the course of structuring of asphaltene components is shown.
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