SYNOPSIS: -On the basis of the analysis of the light naphtha fraction of a coal liquid obtained by liquefaction of Wandoan coal by the NEDOL process, the reaction behavior of some typical components on H-Ga-silicate was examined. n-Paraffins, cyclohexane, and alkylcyclohexanes, which were the major components of the light naphtha fraction, showed high reactivities and afforded aromatics with high selectivities. Because of the reactant-shape selectivity of Ga-silicate, however, some minor components with large molecular sizes, such as 1, 2-dimethylcyclohexane, showed relatively low reactivities, albeit with high armatic selectivities. Tetralin aiso showed a low reactivity which was attributed to its small molecular flexibility. Indan and tetralin afforded indene and naphthalene, respectively, as the predominant product, which were explained by direct dehydrogenation of the naphthene rings, while dealkylation was the major reaction path for the reactions of alkylbenzenes on Gasilicate.
A simulated moving bed reactor was constructed by assuming a new coke oven which produces metallurgical coke rapidly and continuously. Using this reactor, a trial was made to produce metallurgical coke from 4 kinds of coals. The point of the new coke oven lies in a unigue heating pattern of coal: rapid heating up to 450-500°C, holding time for 20 to 30 min, and subsequent slow heating up to 800°C. This heating pattern of coal was realized by use of the simulated moving bed reactor, and the coke comparable to a commercial coke from viewpoint of the CO2 reactivity and the micro strength was produced in about 2 h from highly coking coals. The coke comparable to the commercial coke could also be produced from a slightly coking coal by mixing it with a highly coking coal or by adding a pitch to it, although the coke could not be produced from the slightly coking coal only.
Chemical model structure for Taiheiyo coal was presented. To obtain a information of real structure of coal, it was hydrogenated with mild stepwise methods and the coal derived liquid was analysed precisely. For the construction of chemical model structure, ultimate analysis, chemical analysis and reference data were considered. Figure 2 showed a chemical model structure for Taiheiyo coal. The molecular weight of coal was assumed to be 5000, and the contents of saturates, aromatics and polar parts in oil were reflected in the unit structures of the model. The most characteristic points of this model were the followings that all aromatic units contained hydroxyl groups and bonded with long alkyl chains, esteric and etheric groups. Aromatic units have ring assemblies like a biphenyl. This model can well explains the behavior of Taiheiyo coal under the general liquefaction condition that many of hydrocarbon gases, water and phenols were observed. Carbonization and oxidation reaction were also discussed.