Sorption of Water Vapour on Exinite Concentrates

Maceral concentrates of the exinite group, isolated from the hard coals from the Janina and Brzeszcze Mines were studied. Sorption studies in the coal-water vapour system and the concentrates maceral-water vapour system were carried out using the volumetric method (under isothermal-isobaric conditions) at 298 K, at the following relative sorbate pressures: 0.19; 0.34; 0.52; 0.70 and 0.88.The presented sorption isotherms show that the exinites isolated from coals have higher water vapour sorption capacities than the coals from which they were isolated. Their sorption capacity is closely related to the accessibility of their porous structure during the interfacial-volumetric process of water vapour interaction in the coal substance.