SUPERCRITICAL-DIOXANE EXTRACTION OF TUNCBILEK LIGNITE

After preextraction with ethanol-benzene (1:2) in a Soxhlet apparatus Tuncbilek lignite was extracted with dioxane at 330 degrees C in an au toclave at different pressures and for different exposure times. The e xtracts were fractionated and many of the compounds they contain were identified by gas chromatography/mass spectrometry. The formation and yields of these compounds are discussed in terms of the structure of t he parent fuel and the mechanism of extraction.