Advanced SearchSearch Tips
Comparative Characterization of AFC Precipitated Using Vacuum Drying, Dilution Precipitation and Spray Drying
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
  • Journal title : Korean Chemical Engineering Research
  • Volume 54, Issue 2,  2016, pp.234-238
  • Publisher : The Korean Institute of Chemical Engineers
  • DOI : 10.9713/kcer.2016.54.2.234
 Title & Authors
Comparative Characterization of AFC Precipitated Using Vacuum Drying, Dilution Precipitation and Spray Drying
Kwon, Ho Jung; Choi, Ho Kyung; Jo, Wan Taek; Kim, Sang Do; Yoo, Ji Ho; Chun, Dong Hyuk; Rhim, Young Joon; Lim, Jeong Hwan; Lee, Si Hyun; Rhee, Young Woo;
  PDF(new window)
Solid ash-free coal (AFC) samples recovered from solvent-extracted solution by vacuum drying, dilution precipitation and spray drying methods were compared in terms of physical properties and chemical structure. AFC was prepared by using Kideco coal (Indonesian sub-bituminous coal) and polar N-methyl-2-pyrrolidone (NMP) solvent as raw materials. The physical properties of the AFCs were characterized with proximate, ultimate, and calorific value analysis. In analyzing the chemical structure, FTIR and NMR were used. the proximate analysis showed much reduced ash in the AFCs compared to parent raw coal. The FTIR result showed that the extraction solvent was not fully removed from the AFC prepared by vacuum drying. However, the solvent was not detected in the AFC recovered by using dilution precipitation. Dilution precipitation has advantages over the other two methods, since it can be done at relatively low temperature and separate ash-free coal from extraction solvent more effectively.
Low-rank Coal;Solvent Extraction;Precipitation;Ash-free Coal;
 Cited by
Korea Energy Economics Institute, Yearbook of Energy Statistics( 2014).

BP, Statistical Review of World Energy(2014).

Rahman, M., Samanta, A. and Gupta, R., "Production and Characterization of Ash-Free Coal from Low-Rank Canadian Coal by Solvent Extraction," Fuel Process. Technol., 115, 88-98(2013). crossref(new window)

Sato, Y., Kushiyama, S., Tatsumoto, K. and Yamaguchi, H., "Upgrading of Low Rank Coal with Solvent," Fuel Process. Technol., 85, 1551-1564(2004). crossref(new window)

Park, K. Y., Choi, H. K., Kim, S. D., Yoo, J. H., Chun, D. H., Rhim, Y. J., Lim, J. H., Lee, S. H. and Na, B. K., "Characteristics of Coal Extracted Using Solvent at Mild and High Temperature Conditions," Chemistry for Engineering, 23, 529-533(2012).

Lee, S. H., Kim, S. D., Jeong, S. K., Rhim, Y. J., Kim, D. H. and Woo, K. J., "Ultrasonic Effect on the Extraction of Ash-Free Coal from Low Rank Coal," Korean Chem. Eng. Res., 46(3), 555-560 (2008).

Lee, S. H. and Kim, S. D., "Technology for the Preparation of Ash-Free Coal from Low Rank Coal (LRC)," Korean Chem. Eng. Res., 46(3), 443-450(2008).

Kim, S. D., Woo, K. J., Jeong, S. K., Rhim, Y. J. and Lee, S. H., "Production of Low Ash Coal by Thermal Extraction with N-methyl- 2-pyrrolidinone," Korean J. Chem. Eng., 25(4), 758-763(2008). crossref(new window)

Okuyama, N., Komatsu, N., Shigehisa, T., Kaneko, T. and Tsuruya, S., "Hyper-Coal Process to Produce the Ash-Free Coal," Fuel Process. Technol., 85, 947-967(2004). crossref(new window)

Renganathan, K., Zondlo, J. W., Mintz, E. A., Kneisl, P. and Stiller, A. H., "Preparation of an Ultra-Low Ash Coal Extract under Mild Conditions," Fuel Process. Technol., 18, 273-278(1988). crossref(new window)

KIER Research Report, Development of Technology for the Ashless Coal Production and its Application(2010).

Mozgawa, W., Krol, M., Dyczek, J. and Deja, J., "Investigation of the Coal Fly Ashes using IR Spectroscopy," Spectrochimica Acta, 132, 889-894(2014). crossref(new window)

Kim, K. H., "A Study on Effect of Coal and Solvent Properties on Coal Solvent Extraction," Ph.D. dissertation, Seoul National University(2014).

Lee, S. H., Shon, E. K. and Park, S. W., "Changes in Organic Structure of Coals after Treatment with Molten Caustic Leaching," Korean J. Chem. Eng. Res., 33, 675-683(1995).

Yoshida, T., Sasaki, M., Ikeda, K., Mochizuki, M., Nogami, Y. and Inokuchi, K., "Prediction of Coal Liquefaction Reactivity by Solid State $^{13}C$ NMR Spectral Data," Fuel, 81(11-12), 1533-1539 (2002). crossref(new window)