Extraction kinetics of coals at subcritical and supercritical conditions

Abstract

The extraction kinetics of two lignites and one bituminous coal with benzene, toluene and pyridine were studied at both sub and supercritical 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. The data for Zonguldak coal and those for subcritical extraction of Cizre lignite could be fitted into a first order rate equation with the rate constants changing 0.02-0.05 min(-1) range.