Citation: LÜ Hai-yan, FANG Zheng-mei, ZHANG Yuan-yuan, QIAN Yu-feng, PAN Tie-ying, ZHANG De-xiang. Revalidation of measurement method of free radical concentration and its application in coal chemistry[J]. Journal of Fuel Chemistry and Technology, ;2019, 47(11): 1281-1287. shu

Revalidation of measurement method of free radical concentration and its application in coal chemistry

1.
School of Resources and Environment Engineering, East China University of Science and Technology, Shanghai 200237, China
2.
Analysis and Testing Center, East China University of Science and Technology, Shanghai 200237, China

Corresponding author: ZHANG De-xiang, zdx@ecust.edu.cn
Received Date: 25 July 2019
Revised Date: 7 October 2019

Fund Project: The project was supported by the National Key Research and Development Program of China (2016YFB0600303)the National Key Research and Development Program of China 2016YFB0600303

Figures(3)

The standard curve method established by predecessors to measure the concentration of free radicals in coal was optimized to take the quadratic integral area ratio of the DPPH standard sample to the reference sample as new parameters. The results show that the relative error between the measured and theoretical values of the new parameter standard curve method is less than 5%, and the relative standard deviations of repeatability and reproducibility are less than 3%. The new parameter standard curve method was used to analyze the free radical concentration of the coal with different coal ranks and the asphaltene of Xinjiang Heishan Coal (HS). It is found that with the increase of coal rank, the free radical concentration in the coal increases gradually, from 8.531×10¹⁷/g for low-rank lignite to 3.37899×10¹⁹/g for high-rank anthracite. In the process of HS coal liquefaction, with the increase of liquefaction temperature, the free radical concentration of asphaltene decreases gradually, from 1.5793×10¹⁸/g at 290℃ to 7.410×10¹⁷/g at 450℃. The change trend of free radical is concentration in the asphaltene consistent with that of asphaltene yield.
- free radical concentration,
- standard curve method,
- coal chemistry,
- asphaltene,
- revalidation
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沈阳化工大学材料科学与工程学院沈阳 110142