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Structural Characteristics and Interfacial Properties of n-Hexane- and n-Heptane-Asphaltenes

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In this study, n-hexane-asphaltenes (X–A) and n-heptane-asphaltenes (P–A) were separated and collected by n-hexane and n-heptane respectively. The two asphaltenes were divided into six subfractions (A1–A6) by the mixed solvent (toluene/n-hexane or toluene/n-heptane). The differences between X–A and P–A were studied and the differences between subfractions were compared. And the effects of X–A, P–A and subfractions on oil-water interfacial tension (IFT) were evaluated. The content and polarity of X–A are greater than that of P–A. The ability of X–A reducing oil/water IFT is stronger than that of P–A. The structures of X–A and P–A were simply speculated by the improved B–L method (Bitumen–Liquid product method is used to calculate structural parameters). Both P–A and X–A are cata-condensed and they are mainly tricyclic-aromatics. Moreover, X–A is a kind of high condensation aromatic polymer with regular arrangement, short alkyl chains, low rigidity and more naphthenic rings. P–A is a kind of high condensation aromatic polymer with poor arrangement regularity, long alkyl chains, large rigidity, more aromatic rings but slightly less condensation degree than X–A.

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Authors and Affiliations

  1. College of Chemistry, Jilin University, 130012, Changchun, China

    Yuwen Wang, Tiexin Cheng & Guangdong Zhou

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  1. Yuwen Wang
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  2. Tiexin Cheng
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Correspondence to Guangdong Zhou.

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Wang, Y., Cheng, T. & Zhou, G. Structural Characteristics and Interfacial Properties of n-Hexane- and n-Heptane-Asphaltenes. Pet. Chem. 62, 740–751 (2022). https://doi.org/10.1134/S0965544122050139

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