Low-molecular-mass asphaltene compounds from Usa heavy oil

By the extraction, adsorption chromatography, it has been shown that asphaltene macromolecules from Usa crude oil contain compounds with a relatively low molecular mass represented by normal and branched alkanes; mono- and polycyclic naphthenes; mono-, bi-, tri-, tetra-, and pentacyclic aromatic hydrocarbons; their phenyl and naphthenic derivatives; benzo-, dibenzo-, and naphthobenzothiophenes; carbazoles and benzocarbazoles; ethyl esters of higher fatty acids; and dibenzofurans and fluorenones; as well as by acids, amides, and sulfoxides.