Structural group composition of hydrocarbons from Ishimbaiskoe residual oil

The structural group composition of paraffin-naphthenic and aromatic hydroc arbons isolated from the Ishimbaiskoe residual oil was studied by the mass spectral technique. It was found that the Ishimbaiskoe residual oil contain ed half as much again the amount of higher normal paraffins and monocyclic naphthenes in the corresponding topped produced oil that the but had lower amounts of isoparaffins and total tetra-, penta-, and hexanaphthenic hydroc arbons. Of the aromatic hydrocarbons from the residual oil, those of a hybr id structure prevail. The component type contents of residual and topped pr oduced oils from the Ishimbaiskoe and Urshakskoe fields of Bashkortostan we re compared.