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Insight into the Structure of Asphaltene after Its Disaggregation by Chemical Processing

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Abstract

In order to understand the structure of asphaltene after its disaggregating by chemical processing, a comprehensive study for exploring the structural changes of asphaltene after acylation as a case of chemical processing was conducted. Functional groups, crystal parameters, hydrogen types, and micromorphology of acylated asphaltenes were analyzed by FT-IR, XPS, XRD, 1H NMR, SEM and IFM (inverted fluorescence microscope) methods. Additionally, fluorescence spectroscopy methods were performed to analyze the effect of acylation on the aggregation ability of asphaltene. Experimental results indicated that the C=O double bond was enhanced and the content of O–C=O was increased on the surface of acylated asphaltene. The number of stacking layers and the aggregate size of asphaltene decreased obviously after acylation. Fluorescence spectral analysis showed that the critical aggregation concentration of acylated asphaltenes increased compared to the raw asphaltenes. These results indicate that acylation reaction can disaggregate asphaltenes and hinder their re-aggregation in a solution. The disaggregation effect of asphaltene acylation can be attributed to the weakening of a hydrogen bonding and enhancement of a steric hindrance in the asphaltene molecule. This study provided the further understanding of the structural changes of asphaltene after the chemical treatment.

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Funding

This work was partially supported by the postgraduate innovation project of China University of Petroleum (East China, project no. YCX2020047).

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Authors and Affiliations

  1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum (East China), 266580, Qingdao, China

    Shengchao Wei, Dan Lu, Zhilin Yao, Lijun Zhu, Changlong Yin & Daohong **a

  2. College of Chemistry & Chemical Engineering, China University of Petroleum (East China), 266580, Qingdao, China

    Lijun Zhu, Changlong Yin & Daohong **a

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  1. Shengchao Wei
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  2. Dan Lu
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Contributions

S. Wei: Investigation, Validation, Writing and Editing. D.Lu: Validation, Formal analysis and Writing. Z. Yao: Methodology, Investigation. L. Zhu: Investigation, Resources. C. Yin: Measurement, Validation. D. **a: Conceptualization, Funding acquisition, Review.

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Wei, S., Lu, D., Yao, Z. et al. Insight into the Structure of Asphaltene after Its Disaggregation by Chemical Processing. Pet. Chem. 64, 346–356 (2024). https://doi.org/10.1134/S0965544124030113

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