Distribution of Vanadium and Nickel in the Case of Two-Step Solvent Fractionation of Asphaltenes of Heavy Oils
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General features of the distribution of vanadium and nickel in the products of two-step solvent fractionation of asphaltenes have been using the exampley of heavy crude oils from various fields of the Volga–Urals oil-and-gas basin (Russia). At the first step, during the treatment of a solution of asphaltenes in toluene with an excess of n-hexane, vanadium and nickel are predominantly concentrated in the insoluble fraction that is characterized by increased molecular weight, aromaticity, and degree of condensation with a decreased fraction of heteroatomic sulfur- and oxygen-containing structures. At the second step, during the treatment of the solution of asphaltene fractions in toluene with an excess of dimethylformamide, characteristic features of the distribution of vanadium and nickel in the obtained fractions have been revealed for heavy oils from different fields. As a result, differences in the concentration of metal complexes of vanadyl with asphaltenes have been determined for the heavy oils from Carboniferous and Permian productive sediments.
Keywords:heavy petroleum asphaltenes vanadium nickel extraction N,N-dimethylformamide
The authors are grateful to the employees of the distributed collective spectral and analytical Center for the Studies of the Structure, Composition, and Properties of Substances and Materials of the Federal Research Center “Kazan Scientific Center of the Russian Academy of Sciences” for the performed studies on the determination of the concentration of the metals.
This work was supported by the Russian Science Foundation, agreement no. 19-13-00089.
CONFLICT OF INTEREST
The authors declare no conflict of interest to be disclosed in this paper.
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