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The degree of coalification and chemical properties of macerals were studied concerning the sub-bituminous coal in the Kushiro coal field, eastern Hokkaido.The reflectance of vitrinite ranges from 0.55% to 0.65% in oil. The peak of fluorescence spectra pattern of sporinite and resinite ranges from 490nm to 520nm and from 480nm to 520nm respectively.As the result of the maceral analysis, the macerals of the coal in this field are mainly composed of vitrinite group with under 5% exinite and inertinite groups. The vitrinite group is composed of collinite, telinite and degradinite.Degradinite is characteristic of the Japanese coal and is characterized by higher volatile matter content and carolific value in comparison with collinite and telinite.In the same stage of coal rank, the distribution of normal alkane, CPI value and total n-alkanes of degradinite seems to be different from those of collinite and telinite. That is to say, the distributional maxima of degradinite are n-C29 and n-C31, on the other hand, the maxima of collinite and telinite fall to n-C18 and n-C19. CPI value ranges from 2.3 to 3.4 for the coal with 30-40% degradinite content, and 2.1 for the coal composed of collinite and telinite. Total n-alkanes content is higher in the coal with 30-40% degradinite content than that of collinite and telinite.
石油技術協会の論文