BARZAS COAL-LIQUEFACTION UNDER NONISOTHERMAL CONDITIONS

Barzas coal liquefaction was studied using non-isothermal methods. Three stages of liquefaction are recognised. First (< 375-degrees-C), extraction of the coal molecular phase predominates. Second (375-425-degrees-C), marcromolecular network decomposition, and third (> 425-degrees-C), is characterized by intensive following of secondary reactions leading to formation of low molecular weight products and coke. It is shown that the initial stages, corresponding to temperatures < 425-degrees-C, are described by parallel kinetic schemes with equal values of apparent activation energies of reactions of all considered grouped species (asphaltenes, resin, oil) formation. It is found that asphaltense are the main primary products of the coal network decomposition.