Characteristics of Coals Extracted Using Solvent at Mild and High Temperature Conditions

온순조건과 고온조건에서 용매 추출한 석탄의 특성 비교

  • Park, Keun Yong (Department of Chemical Engineering, Chungbuk National University) ;
  • Choi, Ho Kyung (Clean Fuel Department, Korea Institute of Energy Research) ;
  • Kim, Sang Do (Clean Fuel Department, Korea Institute of Energy Research) ;
  • Yoo, Ji Ho (Clean Fuel Department, Korea Institute of Energy Research) ;
  • Chun, Dong Hyuk (Clean Fuel Department, Korea Institute of Energy Research) ;
  • Rhim, Young Joon (Clean Fuel Department, Korea Institute of Energy Research) ;
  • Lim, Jeong Han (Clean Fuel Department, Korea Institute of Energy Research) ;
  • Lee, Si Hyun (Clean Fuel Department, Korea Institute of Energy Research) ;
  • Na, Byung Ki (Department of Chemical Engineering, Chungbuk National University)
  • 박근용 (충북대학교 화학공학과) ;
  • 최호경 (한국에너지기술연구원 청정연료연구단) ;
  • 김상도 (한국에너지기술연구원 청정연료연구단) ;
  • 유지호 (한국에너지기술연구원 청정연료연구단) ;
  • 전동혁 (한국에너지기술연구원 청정연료연구단) ;
  • 임영준 (한국에너지기술연구원 청정연료연구단) ;
  • 임정환 (한국에너지기술연구원 청정연료연구단) ;
  • 이시훈 (한국에너지기술연구원 청정연료연구단) ;
  • 나병기 (충북대학교 화학공학과)
  • Published : 2012.12.10

Abstract

In this study, we compare various physicochemical properties of solvent extracted coals obtained at both mild and high temperature conditions. In order to characterize the extraction behavior, experiments were performed using a sub-bituminous coal (Kideco) and a polar solvent (N-methyl-2-pyrrolidinone, NMP), where the extraction temperature and the effect of solvent recycling were evaluated. As the extraction temperature increased up to $350^{\circ}C$, an extraction yield and a calorific value of the extracted coal increased, while an ash content of the extracted coal decreased. FT-IR results revealed that the surface of the coal extracted at $350^{\circ}C$ was found to contain more amide, aromatic ester, and aliphatic ether groups than that at the lower temperatures. The result of MALDI-TOF/MS analysis confirmed that the smaller molecules with 300~500 m/z were extracted at a mild condition, while the bigger molecules in the range of 500~1500 m/z were extracted at the high temperature.

Keywords

coal;mild condition;solvent extraction;ash-free coal

References

  1. K. M. Steel and J. W. Patrick, Fuel, 80, 2019 (2001). https://doi.org/10.1016/S0016-2361(01)00092-8
  2. S. H. Lee and S. D. Kim, J. Korean Ind. Eng. Chem., 46, 443 (2008).
  3. S. H. Lee, S. D. Kim, S. K. Jeong, Y. J. Rhim, D. H. Kim, and K. G Woo, J. Korean Ind. Eng. Chem., 46, 555 (2008).
  4. H. K. Choi, S. D. Kim, J. H. Yoo, D. H. Chun, J. H. Lim, Y. J. Rhim, and S. H. Lee, Korean Chem. Eng. Res., 50, 449 (2012). https://doi.org/10.9713/kcer.2012.50.3.449
  5. N. Kashimura, T. Takanohashi, and I. Saito, Energy & Fuels, 20, 1605 (2006). https://doi.org/10.1021/ef060050a
  6. A. Jorge, R. Orrego-Ruiz, E. Cabanzo, and M. Ospino, International Journal of Coal Geology, 85, 307 (2011). https://doi.org/10.1016/j.coal.2010.12.013
  7. T. Yoshida, T. Takanohashi, K. Sakanishi, I. Saito, M. Fujita, and K. Mashimo, Fuel, 81, 1463 (2002). https://doi.org/10.1016/S0016-2361(02)00068-6
  8. K. Miura, M. Shimada, and H. Y. Sock, Fuel, 80, 1573 (2001). https://doi.org/10.1016/S0016-2361(01)00036-9
  9. Kobe Steel Ltd., Final Report of Hyper Coal Project (2005).
  10. E. Rusin, A. Rusin, and W. Potyka, Fuel. 67, 1143 (1988). https://doi.org/10.1016/0016-2361(88)90385-7