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Viscosity–Temperature Properties of Model Oil Systems Rich in Asphaltenes and Paraffins

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Abstract

The paper describes a comparative assessment of viscosity–temperature curves for a number of model mixtures prepared from crude oil maltenes isolated from unstable oils (with island-type asphaltenes) and stable oils (with archipelago-type asphaltenes) with the addition of 5 wt % of individual n-alkanes (C10 or C23) and/or asphaltenes (native or foreign). All the viscosity–temperature curves consist of two distinct regions, namely a low-temperature region (10–30°C) and a high-temperature region (30–50°C), within which the behavior of oil systems is governed by the presence of solid paraffin crystals and the aggregation state of asphaltenes, respectively. It is assumed that, at high temperatures, the most critical factors responsible for the viscosity–temperature properties of oil systems are the asphaltene structural type (island or archipelago) and the propensity of the asphaltenes to flocculation or paraffin–asphaltene aggregation. It is further demonstrated that the flocculation of asphaltenes is accompanied by the entrapment of n-alkanes contained in the dispersion medium, and that the amounts trapped by island-type asphaltenes are higher.

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ACKNOWLEDGMENTS

The authors are grateful to the researchers of the Multiple-Access Spectro-Analytical Center for Physical-Chemical Study of Structure, Properties and Composition of Substances and Materials, FRC Kazan Scientific Center of RAS, for their kind cooperation in the IR and EPR spectroscopy examination.

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Authors and Affiliations

  1. A.E. Arbuzov Institute of Organic and Physical Chemistry, Kazan Scientific Center, Russian Academy of Sciences, 420088, Kazan, Russia

    E. E. Barskaya, Yu. M. Ganeeva, E. S. Okhotnikova, T. N. Yusupova & Yu. L. Karabut

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  1. E. E. Barskaya
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  2. Yu. M. Ganeeva
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  3. E. S. Okhotnikova
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  4. T. N. Yusupova
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Correspondence to E. E. Barskaya.

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Barskaya, E.E., Ganeeva, Y.M., Okhotnikova, E.S. et al. Viscosity–Temperature Properties of Model Oil Systems Rich in Asphaltenes and Paraffins. Pet. Chem. 63, 128–137 (2023). https://doi.org/10.1134/S0965544123020160

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  • DOI: https://doi.org/10.1134/S0965544123020160

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