Es. Vayisoglu et al., CHEMICAL-COMPOSITION OF SCG EXTRACTS OBTAINED FROM COAL AND MACERAL CONCENTRATES, Fuel processing technology, 46(2), 1996, pp. 99-115
Five Turkish coals and macerals were subjected to supercritical toluen
e extraction at 400 degrees C and 100 atm The extracts were separated
into three fractions, namely preasphaltene, asphaltene and oil. Oil fr
actions were further separated into paraffinic, aromatic and polar sub
-fractions. This paper discusses the spectroscopic and chromatographic
analysis of these paraffinic, aromatic and polar sub-fractions obtain
ed from the supercritical extraction of whole coals and of their corre
sponding maceral concentrates.