Chemical composition of high resin petroleum tar

The data from physico-chemical methods (elemental analysis, IR, NMR spectroscopy, etc.) and integral structural analysis are used to calculate the average structural parameters and to determine structural-molecular models of compounds contained in commercial tar of West Siberian, Romashkino and Arlan petroleums. The high molar mass compounds of the petroleums examined were characterized by unique principles of structural-molecular organization of corresponding typical fragments, which include similar naphthene-aromatic condensed systems of five-to-six rings; the results explain the possibility of mutual transitions of high molar mass petroleum compounds as well as the katagenic transformations of petroleum during processing. 12 references, 8 tables.