Abstract
Six samples of Japanese coal were extracted by creosote oil (200-300°cfraction) and the yield of extract (Y%) was determined at the temperature 200-375°C (T).
Assuming that a maximum of dY/dT vs T corresponds to a component of coal and that the energy which is necessary for extraction shall be shared to the energies to divide each component into the-unit substance (Softening heat, QY) and to disperse the units into solvent (QM), QY of each componentwas calculated.Mean QY is in the range of 3.5-36kcal/mol.In the case of low rank and non caking coal, the structure of coal seems to be the non extractable substance forming a rigid skeleton and low QY component is absorbed in the space.High swelling and weakly coking coal consists of the low QY components alone.The QY of strongly coking coal is higher than that of high swelling coal, although it is not so high.Anthracite is composed of high QY and non extractable component.
Molecular weight of extractable component is also calculated from QM.The mean molecular weight of each component is in the range of 101-1012 and the relation to the sorts of coal is almost similar to QM.
