EXTRACTION KINETICS OF COALS AT SUBCRITICAL AND SUPERCRITICAL CONDITIONS

The extraction kinetics of two lignites and one bituminous coal with b enzene, toluene and pyridine were studied at both sub and supercritica l conditions in a batch reactor equipped with a coal basket. The time- extract yield data of lignites at supercritical conditions could'nt be treated due to severe thermal decomposition and heating-up effects. T he data for Zonguldak coal and those for subcritical extraction of Ciz re lignite could be fitted into a first order rate equation with the r ate constants changing 0.02-0.05 min(-1) range.