ANALYSIS OF STRUCTURE OF VITRAINS AND DURAINS ON THE BASIS OF A DUAL SORPTION MODEL

A thermodynamic model of isothermal sorption of small molecules on coa l is used to analyse the structure of some petrographic forms of coal. The process is viewed as consisting of absorption and adsorption. The sorbent is considered as containing aromatic domains, elastic chain c ompounds and submicropores. A generalized Flory equation describes the absorption process and a modified Langmuir equation the adsorption in submicropores. Energy interactions between the subprocesses are taken into account. Parameters representing the geometry of particles of th e sorbent components and of submicropores, as well as energy parameter s of the sorption system, are included in the model. They can be deter mined from empirical sorption data. The model is applied to the struct ure of vitrains and durains. Water and methanol are used as the sorbat es. Energy interactions in the sorption system are also characterized quantitatively.