Coal solvent extraction is a clean coal technology that involves the extraction of organic matter from coal using solvents. In this study, the effects of various coal and solvent properties on extraction yield were studied and their correlations were observed. Solvent extraction was performed for fifteen coal samples of different ranks with eight solvents under mild conditions. Statistical analyses were then conducted to find correlations between the extraction yields and the coal and solvent characteristics. The extraction yield was strongly correlated with the atomic H/C ratio or volatile matter content. Among the solvent properties, the correlation between the electron donor, acceptor number (DNAN) and yield was confirmed to be high. The results of multiple regression showed that positive correlations were found with the content of volatile matter of coal and polar force, DN-AN of solvent. Whereas negative correlations were found with the Ca/Mg content of coal and dispersion force, hydrogen bonding force of solvent. The regressionequation-calculated value was similar to the experimental value.

Coal Solvent Extraction Extraction Yield Extraction Factor Multiple Regression

Berkowitz N, An Introduction to Coal Technology, Academic Press, Inc., New York (1994).
Okuyama N, Komatsu N, Shigehisa T, Kaneko T, Tsutuya S, Fuel Process. Technol., 85(8-10), 947 (2004)
Yoshida T, Takanohashi T, Sakanishi K, Saito I, Fujita M, Mashimo K, Fuel, 81(11-12), 1463 (2002)
Yoshida T, Li C, Takanohashi T, Matsumura A, Sato S, Saito I, Fuel, 87, 491 (2004)
Iino M, Takanohashi T, Obara S, Tsueta H, Sanokawa Y, Fuel, 68, 1588 (1989)
Krevelen DWV, Fuel, 44, 229 (1965)
Marzec A, Jozwa M, Betlej K, Sobkowiak M, Fuel Process. Technol., 2, 35 (1979)
Gutmann V, Wychera E, J. Inorganic Nuclear Chem., 2, 257 (1966)
Gutmann V, Electrochim. Acta, 21, 661 (1976)
Bodzek D, Marzec A, Fuel, 60, 47 (1981)
Chawla B, Davis BH, Fuel Process. Technol., 23, 133 (1989)
Iino M, Takanohashi T, Ohsuga H, Toda K, Fuel, 67, 1639 (1988)
Green TK, Kovzac J, Brenner D, Larsen JW, Coal structure, Academic Press, Inc., New York (1982).
Aida T, Tsutsumi Y, Yoshinaga T, Preprints of Papers - American Chemical Society, Division of Fuel Chemistry, 41, 744 (1996)
Shui HF, Wang ZC, Gao JS, Fuel Process. Technol., 87(3), 185 (2006)
Kashimura N, Takanohashi T, Masaki K, Shishido T, Sato S, Matsumura A, Saito I, Energy Fuels, 20(5), 2088 (2006)
Van Niekerk D, Mitchell GD, Mathews JP, Int. J. Coal Geol., 81(1), 45 (2010)
Shui HF, Zheng MD, Wang ZC, Li XM, Fuel, 86(10-11), 1396 (2007)
Shui HF, Lin CH, Zhang M, Wang ZC, Zheng MD, Fuel, 89(7), 1647 (2010)
Dyrkacz GR, Bloomquist CAA, Energy Fuels, 15(6), 1409 (2001)
Krevelen DWV, Fuel, 29, 269 (1950)
Hansen CM, J. Paint Technol., 39, 505 (1967)
Barton AFM, Handbook of solubility parameters and other cohesion parameters, second Ed., CRC Press (1991).
Damin T, Xiangyun L, Mingjie D, Mining Sci. Technol., 20, 562 (2010)
Maroto-Valer MM, Andresen JM, Snape CE, Fuel, 77(7), 783 (1998)
Hayamizu K, Ohshima S, Fuel, 64, 130 (1985)
Russell NJ, Wilson MA, Pugmire RJ, Grant DM, Fuel, 62, 601 (1983)
Vassallo AM, Wilson MA, Edwards JH, Fuel, 66, 622 (1987)
Lee S, Shon E, Park S, Korean Chem. Eng. Res., 33, 675 (1995)
Ashida R, Morimoto M, Makino Y, Umemoto S, Nakagawa H, Miura K, Saito K, Kato K, Fuel, 88(8), 1485 (2009)
Wang J, Li CQ, Sakanishi K, Nakazato T, Tao H, Takanohashi T, Takarada T, Saito I, Fuel, 84(12-13), 1487 (2005)
Zhang L, Takanohashi T, Kutsuna S, Saito I, Wang QY, Ninomiya Y, Fuel, 87(12), 2628 (2008)
Vassilev SV, Tascon JMD, Energy Fuels, 17(2), 271 (2003)