58.種々の分子をプローブとする溶媒膨潤炭の構造評価(1)

抄録

Structural and interfacial properties of coals (C=65-91wt%) were investigated by means of inverse liquid chromatography, the stationary phase of which was coal particles preswollen in solvents. The carrier phase was acetonitrile, methanol or n-hexane. The molecular probes used were alkylbenzenes, polycyclic aromatic hydrocarbons (PAHs) and n-alkanes. The retention volume of the probes was measured in the temperature range of 20-50℃. The elution of the aromatic probes was controlled by the adsorption onto the coal surface. In most cases, the capacity ratio increased with increasing molecular volume of probe compound for each group of alkylbenzenes or PAHs. The capacity ratio of the PAHs was much larger than that of alkylbenzenes when their molecular volumes were equal, which indicates that the aromatic ring of a probe molecule was recognized by the coal more selectively than were alkyl chains. The π-π interaction was important for high-rank coals, and the OH-π interaction for low-rank coals.