Abstract
By use of a 300ml high pressure batch autoclave, in the presence of a massive quantity of zinc chloride hydrocracking of akabira coal and akabira coal extract was carried out at the reaction temperature from 300°C to 425°C under the hydrogen pressure of about 190kg/cm2. The changes of the conversion and of the properties of the reaction products were investigated with the reaction time and the reaction rate was analyzed. The conversion increased with the reaction time and temperature but had a tendency to decrease at higher temperature. The gaseous product increased in the yield and changed into methane, ethane and propane-rich component gas with the reaction time and temperature. By the measurements of the gel permeation chromatography, the liquid product was found to consist of three compound groups whose weight-avarage molecular weight were about 120, 250 and 800 to be ultimately hydrocracked into the 120 molecular weight compound group by a way of a parallel and consecutive mixed reaction. Taking account of the changeable properties of reactants and products, i. e. these changeable reactivities, kinetics was considered. Assuming that instantaneous reaction rate was linearly proportional to the quantity of unreacted coal or extract (benzene-insolubles), the overall rate constants at an arbitrary conversion satisfied the Arrhenius equation. The activation energy increased with the conversion and it could be shown that the overall hydrocracking reaction was changing into the difficult with the progress of the reaction.
