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ABSTRACT
Thermal extraction yields were obtained for 13 coals in supercritical ethanol at 250°C. The direct and indirect relationships between extraction yield and coal properties were determined using correlation and path analyses. Both nitrogen content and hydrogen content have significant and positive correlations with thermal extraction yield. However, moisture content, sulfur content, and oxygen content exhibited negative correlations with extraction yield. Path analysis demonstrated that nitrogen and carbon contents had significant direct and indirect influences on extraction yield, respectively. Nitrogen content is the preferential factor for a high extraction yield, followed by carbon and hydrogen contents.
Funding
This research work was supported by the Fund from National Natural Science Foundation of China (Grant 21306153), the Special Research Foundation of Education Bureau of Shaanxi Province (Grant 14JK1748 and 15JK1692), the National Key Technology Research and Development Program (Grant 2015BAL01B04), and the Fund from Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education (China University of Mining and Technology).