GAS CHOMATOGRAPHIC STUDY OF THE COMPOSITION AND STRUCTURE OF COAL PITCH.

It is shown that coal pitch is a complex heterophase system consisting of a eutectic mixtures of individual compounds of the aromatic and heterocyclic groups, polymers of amorphic structure, and mesomorphic phases - liquid crystals and aromatic crystallites - similar to the graphite crystallite of soot formation and mechanical impurities of coal dust and coke. The gamma -fraction by weight consists of a eutectic mixture of compounds of the aromatic and heterocyclic groups. On an increase in temperature it becomes an isotropic liquid and has no fixed phase transition temperature. The beta -fraction has the fixed temperature interval typical of the phase transition of an amorphous polymer, and contains up to 10% aromatic and heterocyclic compounds with molecular weight to 330. The alpha //2-fraction has all the properties of a polymer of mesomorphic structure, and has two fixed temperature transitions: solid crystal to liquid and liquid crystal to isotropic liquid.