Distribution of vanadium and vanadyl porphyrins during fractionation of resins of heavy sulfurous oils.

Features of the content and distribution of vanadium and vanadyl porphyrins in the fractions of resins, which were obtained by separation using column chromatography on silica, have been studied on heavy sulfurous oils of various deposits of the Volga-Ural basin (Russia). The difference of the vanadium and vanadyl porphyrin contents in the fractions of oils of various production complexes has been shown. Features of structural-group composition and predominant types of vanadyl porphyrins in the fractions of resins have been determined. [ABSTRACT FROM AUTHOR]