Scholarly record
FEATURES OF THE COMPOSITION AND PROPERTIES OF HEAVY OIL ASPHALTENES OF VARIOUS PRODUCTIVE COMPLEXES OF THE DEPOSITS FROM VOLGA-URAL OIL AND GAS BASIN
Abstract
Vanadium and nickel are concentrated in the asphaltene-resinous part of the oil; while the maximum amount of these metals is found in asphaltenes. Vanadium as the vanadyl cation VO2+ and nickel in the form of the cation Ni2+ are coordinated predominantly by porphyrins and their tetrapyrrole analogs. Petroleum feedstock with high metals content is unsuitable for catalytic refining processes. In addition, vanadium and nickel significantly affect the thermal cracking and hydrodemetallization of heavy oil residues. Primary removal of the metals from petroleum feedstock can be performed by deasphalting, and the main part of vanadium and nickel remains in the asphaltene concentrate. However, the amount and ratio of the metals in the resulting products is usually estimated empirically; thus, and it is impossible to predict these quantities in a feedstock of another composition. Therefore, it is important to reveal the trends in vanadium and nickel concentrations in asphaltenes of heavy oils of different compositions. In this work, composition and distribution of vanadium and nickel in asphaltenes are studied by the example of heavy oils from the Permian and the Carboniferous productive complexes of the deposits from Volga-Ural oil and gas basin. Determination of the bulk composition of the oils and isolation of asphaltenes were conducted according to the conventional procedure. The concentration of vanadium and nickel was determined by direct flame atomic absorption spectrometry on an AAS-1N spectrophotometer. The discrepancy in the results of determination of the metals did not exceed 0.0001. Trends in the vanadium and nickel concentrations in asphaltenes of heavy oils from different oilfields, in which the total content of these metals vary from 0.0049 to 0.1795 wt %, have been studied. It has been shown that as the vanadium and nickel content in heavy oils increases, vanadium concentrates faster than nickel in asphaltenes. In heavy oils, asphaltenes contain approximately 40?90% of total vanadium and 25?75% of total nickel. The summed concentration of vanadium and nickel in heavy oil asphaltenes can reach 1 wt %.
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