Abstract
The molecular weight of the humic acid obtained from the hydrogenolysis product of Onoura bituminous coal was estimated by the cryoscopic measurement of the aqueous solution of the potassium humate.It was concluded that the structural unit of this coal should be demonstrated by the following formula.
C24.9 H22.4 O1.2 N0.4 S0.1, Molecular weight 350
A structural model of Onoura bituminous coal was proposed and the alteration in the chemical structure of coal by the rank was discussed, according to the empirical evidences which have been published by the present authors.That is, the chemical structure of this coal would be understood by the following illustration and the heterogeneity in the structure would be improved by the advance of the coalification up to the higher rank bituminous coal.
