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

LÜ Hai-yan; FANG Zheng-mei; ZHANG Yuan-yuan; QIAN Yu-feng; PAN Tie-ying; ZHANG De-xiang

Volume 47 Issue 11

Nov. 2019

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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.

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.

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.

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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

Funds:

the National Key Research and Development Program of China 2016YFB0600303

More Information

Corresponding author: ZHANG De-xiang, Tel:021-64252367, E-mail:zdx@ecust.edu.cn
Received Date: 2019-07-25
Rev Recd Date: 2019-10-07

Available Online: 2021-01-23

Publish Date: 2019-11-10

Abstract

Abstract

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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References(22)

References

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