Safin V. Role of oxygen and sulfur in coal thermal decomposition processes

The thesis is devoted to studying of the oxygen and sulfur influence on structure, reactivity, thermal and thermochemical destruction of coals. The behavior the coals of different genetic types by reductivity (LRC and RC) in various processes of pyrolysis (semicoking, pyrolysis in a water vapor stream, thermofiltration) are investigated. The research has demonstrated that sulfur containing coals formed a higher quantity of liquid products than low-sulfur containing coals. The plastic layer of RC and LRC has a differing composition and contain n-alkanes, polycyclic aromatic compounds and heterocyclic hydrocarbons. The obtaining data shows that organic mass of LRC undergoes more profound transformation in the pyrolysis process than organic mass of RC. These facts have been explained by various associations of high-condensed aromatic blocks in coal macromolecules. In conclusion, the comparison of liquid products proved that more valuable products for petroleum production are formed from semi-coking tar of high sulfur containing coals. Such coals are valuable raw material for adsorbent producing.