Chemical structure of coal tar during devolatilization

摘要: Three coals of different rank were pyrolyzed in a drop-tube reactor at maximum temperature 900 K and residence time 160 ms. The coal char analyzed with solid-state 13 C NMR. tar was dissolved deuterated methylene chloride. It found that the only partially soluble CD 2 Cl . nonsoluble portion same manner as char, while using recently developed high-resolution NMR technique for liquid phases. structure to be significantly from coal. number bridges loops per cluster up 65% lower than char. In addition, aromatic carbons either or Since molecular weight is reported average weights, these data imply made multiple clusters (dimers, trimers, etc.) well single (i.e., monomers). mass nitrogen These experimental findings suggest changes may necessary current network devolatilization models accurately describe chemical structure.