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

IF 1.3 4区工程技术 Q3 CHEMISTRY, ORGANIC Petroleum Chemistry Pub Date : 2024-06-21 DOI:10.1134/s0965544124030113

Shengchao Wei, Dan Lu, Zhilin Yao, Lijun Zhu, Changlong Yin, Daohong Xia

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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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透视沥青烯经化学处理分解后的结构

摘要为了解沥青烯经化学加工分解后的结构，以酰化沥青烯为例，对沥青烯经化学加工后的结构变化进行了综合研究。通过傅立叶变换红外光谱、XPS、XRD、1H NMR、扫描电镜和 IFM（倒置荧光显微镜）方法分析了酰化沥青质的官能团、晶体参数、氢类型和微观形态。此外，还采用荧光光谱法分析了酰化对沥青质聚集能力的影响。实验结果表明，酰化沥青质表面的 C=O 双键增强，O-C=O 含量增加。酰化后沥青质的堆积层数和聚集尺寸明显减小。荧光光谱分析显示，与未加工的沥青质相比，酰化沥青质的临界聚集浓度有所增加。这些结果表明，酰化反应可以分解沥青质，并阻碍其在溶液中重新聚集。沥青烯酰化的解聚效应可归因于沥青烯分子中氢键的减弱和立体阻碍的增强。这项研究使人们进一步了解了沥青烯经化学处理后的结构变化。

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来源期刊

Petroleum Chemistry 工程技术-工程：化工

CiteScore

2.50

自引率

21.40%

发文量

102

审稿时长

6-12 weeks

期刊介绍： Petroleum Chemistry (Neftekhimiya), founded in 1961, offers original papers on and reviews of theoretical and experimental studies concerned with current problems of petroleum chemistry and processing such as chemical composition of crude oils and natural gas liquids; petroleum refining (cracking, hydrocracking, and catalytic reforming); catalysts for petrochemical processes (hydrogenation, isomerization, oxidation, hydroformylation, etc.); activation and catalytic transformation of hydrocarbons and other components of petroleum, natural gas, and other complex organic mixtures; new petrochemicals including lubricants and additives; environmental problems; and information on scientific meetings relevant to these areas. Petroleum Chemistry publishes articles on these topics from members of the scientific community of the former Soviet Union.