抄録
In order to investigate the initial stage liquefaction of coal in the process of rising temperature, heat-treatment of slurries consisting of wandoan coal and hydrogenated anthracene oil (1: 3 by weight) were carried out under three heating patterns with a pipe reactor which was designed to obtain six samples in the course of heating.
Solvent insoluble matters such as toluene insolubles (TI) and pyridine insolubles (PI), viscosities and relative weight average molecular weight to polystyrene of filtrates, 50% mean particle size of unreacted coal and concentrations of hydrogen donor components in filtrates were affected by heating pattern.
TI and PI began to decrease at about 300°C and 250°C, respectively. Both decreased steeply above 400°C.
Relation between viscosities of heated slurries at room temperature and heating patterns were not observed, but in any case, viscosities of heated slurries increased with an increase in sampling temperature.
50% mean particle size of unreacted coal gradually increased up to about 400°C by swelling and decreased above 400°C by disintegration. The disintegration of unreacted coal steeply increased°Ciscosities of filtrates and weight average molecular weight because of solubilization of coal into the vehicle.
Concentrations of hydrogen donor components such as dihydrophenanthrene, tetrahydrofluoranthene and dihydropyrene in the filtrates decreased with an decrease in TI and PI, that is, those components contributed effectively to coal liquefaction.
