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Distribution and Composition of High-Molecular-Mass Components in Oily Sludge

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Abstract

Three kinds of organic components, namely, entrapped oil and reversibly and irreversibly adsorbed on finely dispersed mechanical impurities oils, are identified in the oily sludge obtained by centrifugation of the extracted crude oil from the Abdrakhmanovo area of the Romashkino field. The entrapped oil (about 4 vol %) is enriched in resins and depleted of hydrocarbon components with increased fraction of low-molecular-mass n-alkanes. The content of reversibly adsorbed oil does not exceed 5 wt %. It contains ester fragments and increased fraction of high-molecular-mass alkanes; also, it is enriched in polar resins and “soft” asphaltenes. The content of irreversibly adsorbed oil is approximately 3 wt %. According to the thermal analysis data, irreversibly adsorbed oil consist mainly of weakly carbonized structures whose thermal oxidative degradation occurs at temperatures of up to 300°С. Relatively high content of hydrocarbons, including n-alkanes up to C24, in the entrapped oil makes oily sludge promising for the production of a wide range of oil products.

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ACKNOWLEDGMENTS

The authors are grateful to the Collective Spectral and Analytical Center of Physicochemical Investigations of the Structure, Properties, and Composition of Substances and Materials, Federal Research Center Kazan Scientific Center, Russian Academy of Sciences, for performing the IR and EPR studies.

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

    E. E. Barskaya, E. S. Okhotnikova, Yu. M. Ganeeva, V. I. Morozov & T. N. Yusupova

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  1. E. E. Barskaya
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Barskaya, E.E., Okhotnikova, E.S., Ganeeva, Y.M. et al. Distribution and Composition of High-Molecular-Mass Components in Oily Sludge. Pet. Chem. 62, 151–160 (2022). https://doi.org/10.1134/S0965544122060032

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