Optical properties of supercritical toluene extraction residues obtained from Turkish coals

Vayisoglu E., Bartle K., Erbatur N.

ENERGY SOURCES, vol.19, no.6, pp.531-536, 1997 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 19 Issue: 6
  • Publication Date: 1997
  • Doi Number: 10.1080/00908319708908869
  • Title of Journal : ENERGY SOURCES
  • Page Numbers: pp.531-536


Two Turkish coals of subbituminous C and high-volatile bituminous rank were subjected to supercritical toluene extraction at 400 degrees C and 100 atm. The solid residues were examined microscopically in order to gain useful insight into the mechanisms involved in supercritical toluene extraction. The disappearance of liptinite macerals is a feature of the optical texture of both coals subjected to the extraction process. Residues of the two coals produced high-reflecting vitroplast. The amount of inertinite macerals in the residues increased and showed higher reflectance. No other alterations were observed for the inertinite macerals in the extraction residues.