Chemical Model Structure for Taiheiyo Subbituminous Coal

Abstract

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.