Citation: DU Jun-tao, ZHANG Da-kui, ZHANG Min-xin, JIA Hui-na, NIE Yi, SUN Yi-kai, DENG Wen-an, LI Chuan. Structure characteristics and association behavior of coal and petroleum C7-asphaltenes[J]. Journal of Fuel Chemistry and Technology, ;2020, 48(6): 674-682. shu

Structure characteristics and association behavior of coal and petroleum C7-asphaltenes

DU Jun-tao ¹ ,
ZHANG Da-kui ² ,
ZHANG Min-xin ¹ ,
JIA Hui-na ¹ ,
NIE Yi ^1,, ,
SUN Yi-kai ¹ ,
DENG Wen-an ³ ,
LI Chuan ³

1.
Department of Green Technology Research, Zhengzhou Institute of Emerging Industrial Technology(Institute of Process Engineering, Chinese Academy of Sciences, Zhengzhou), Zhengzhou 450000, China
2.
Ansteel Chemical Technology Co., Ltd., Anshan 114000, China
3.
State Key Laboratory of Heavy Oil, China University of Petroleum(East China), Qingdao 266580, China

Corresponding author: NIE Yi, ynie@ipe.ac.cn
Received Date: 1 June 2020
Revised Date: 5 June 2020

Fund Project: the National Natural Science Foundation of China 21908206The project was supported the National Natural Science Foundation of China (21908206)

Figures(5)

The structural characteristics and differences of coal tar and petroleum C7-asphaltenes were studied, such as chemical composition, functional groups and molecular structure, using nuclear magnetic resonance (NMR), small angle X-ray scattering (SAXS), X-ray photoelectron spectroscopy (XPS), improved B-L method and other methods. Furthermore, the association behavior and aggregation size of two different types of asphaltenes as well as the hydrogen bonds and acidic-basic interaction were analyzed by asphaltenes solubility parameters in polar solvents. The experiment results showed that the coal tar asphaltenes (CT-asp) was mainly composed of less aromatic rings with more short alkyl branched chains and possessed a high aromaticity degree. The higher content oxygen heteroatoms of CT-asp were mostly presented as aromatic ether bonds and phenolic hydroxyl groups. The aromatic nucleus size and the average relative molecular weight of petroleum asphaltenes (M-asp) were larger than that of CT-asp. The M-asp consisted primarily of more aromatic rings with more long alkyl branched chains and possessed a low aromaticity degree. The association and aggregation degree between CT-asp and M-asp was associated with the amount of substance ratio (n_CT-asp/n_M-asp) and their molecular structure characteristics. The association force of two types mainly was the hydrogen bonds and the acidic-basic interaction from heteroatomic functional groups.
- coal tar,
- petroleum,
- C7-asphaltene,
- molecular structure,
- association behavior
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