Kazan (Volga region) Federal University, KFU
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EPR STUDY OF SPECTRA TRANSFORMATIONS OF THE INTRINSIC VANADYL-PORPHYRIN COMPLEXES IN HEAVY CRUDE OILS WITH TEMPERATURE TO PROBE THE ASPHALTENES' AGGREGATION
Form of presentationArticles in international journals and collections
Year of publication2018
Языканглийский
  • Vakhin Aleksey Vladimirovich, author
  • Volodin Mikhail Aleksandrovich, author
  • Gafurov Marat Revgerovich, author
  • Mamin Georgiy Vladimirovich, author
  • Orlinskiy Sergey Borisovich, author
  • Rodionov Aleksandr Aleksandrovich, author
  • Sorokina Aleksandra Timurovna, author
  • Dolomatov Mikhail Yurevich, author
  • Bibliographic description in the original language Gafurov M.R. EPR study of spectra transformations of the intrinsic vanadyl-porphyrin complexes in heavy crude oils with temperature to probe the asphaltenes' aggregation / M.R. Gafurov, M.A. Volodin, A.A. Rodionov, A.T. Sorokina, M.Yu. Dolomatov, A.V. Petrov, A.V. Vakhin, G.V. Mamin, S.B. Orlinskii // Journal of Petroleum Science and Engineering. – 2018. – V. 166. – P. 363-368.
    Annotation Temperature dependencies of electron paramagnetic resonance spectra of intrinsic paramagnetic vanadyl complexes and dynamical viscosity for two heavy crude oils and asphalt samples are measured. Transitions between the different motional conditions (from the rigid to the fast motion regimes) are observed. The rotational correlation times (in the model of the isotropic diffusion) are extracted. It is shown that the characteristic temperatures for the motional regime transitions are mainly defined by the asphaltenes' content. From our analysis it follows that the thermal treatment leads to the destruction of the asphaltene complexes onto the 4–5 small pieces. The results indicate that paramagnetic vanadyl complexes are the sensitive intrinsic probes to study qualitatively and quantitatively structural transformations of aspahltenes of heavy crude oils in-situ.
    Keywords Bitumen, Crude oil, Heavy oil, Rotational correlation time, Temperature dependence,ESR
    The name of the journal Journal of Petroleum Science and Engineering
    On-line resource for training course http://dspace.kpfu.ru/xmlui/bitstream/handle/net/130812/S.EPR.Gafurov.pdf?sequence=1&isAllowed=y
    URL https://www.sciencedirect.com/science/article/pii/S0920410518301517
    Please use this ID to quote from or refer to the card https://repository.kpfu.ru/eng/?p_id=177331&p_lang=2
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