Methane adsorption capacity of extracted coals under control of solvent polarity

CHEN Run; WANG Zhi-yang; QIN Yong; WANG Lin-lin; WEI Chong-tao; WANG You-yang

Volume 43 Issue 10

Oct. 2015

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Article Navigation > Journal of Fuel Chemistry and Technology > 2015 > 43(10): 1153-1157

CHEN Run, WANG Zhi-yang, QIN Yong, WANG Lin-lin, WEI Chong-tao, WANG You-yang. Methane adsorption capacity of extracted coals under control of solvent polarity[J]. Journal of Fuel Chemistry and Technology, 2015, 43(10): 1153-1157.

Citation:

CHEN Run, WANG Zhi-yang, QIN Yong, WANG Lin-lin, WEI Chong-tao, WANG You-yang. Methane adsorption capacity of extracted coals under control of solvent polarity[J]. Journal of Fuel Chemistry and Technology, 2015, 43(10): 1153-1157.

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Methane adsorption capacity of extracted coals under control of solvent polarity

1.
Key Laboratory Coal-based CO₂ Capture & Geological Storage of Jiangsu Province, Low Carbon Energy Institute, China University of Mining and Technology, Xuzhou 221008, China;
2.
Low Carbon Energy Institute, China University of Mining and Technology, The Key Laboratory of coal-based CO₂ Capture & Geological Storage, Jiangsu Province, Xuzhou 221008, China

Funds: The project was supported by the National Natural Science Foundation of China (41202117, 41572138), the China Postdoctoral Science Foundation (2013M540473), the Jiangsu Postdoctoral Science Foundation (1301035B), the Fundamental Research Fund for Central University (2014QNA17) and the Scientific Research Foundation of Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process, Ministry of Education (2013-006).

Received Date: 2015-04-24
Rev Recd Date: 2015-05-29
Publish Date: 2015-10-31

Abstract

Abstract

Based upon isothermal methane adsorption on raw and solvent extracted coals, relationship between solvent polarity and methane adsorption capacity change of the coal was analyzed, and the possible geochemical mechanism was discussed from polarity of the solvents. The results show that methane isothermal adsorption curves on the extracted coals follow the Langmuir equation. Extraction with CS₂ and C₆H₆ enhances methane adsorption capacities on extracted coals, and that with tetrahydrofuran (THF) and acetone is opposite. There is a negative correlation between methane adsorption capacity change of the coal and the solvent polarity, which can be explained by similarity-intermiscibility theory. The polarities of CS₂ and C₆H₆ are weaker, which can extract more alkane and aromatic hydrocarbons with nonpolar molecule structure (-CH₃ and -CH₂-) to increase the adsorbed space of coal surface for methane adsorption. The polarities of THF and acetone are stronger, which can extract more non-hydrocarbon and asphaltene with polar molecule structure (-CHO, -OH and -COOH) to reduce the adsorbed space of coal surface for methane adsorption.
- adsorption,
- organic solvent extraction,
- similarity-intermiscibility theory,
- solvent polarity

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References(12)

References

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