A Study on the Chemical Structure of Pyridine Extract of Coal by High Resolution Nuclear Magnetic Resonance Spectroscopy (II):On the Constitution of the Petroleum Ether Soluble Portion of Pyridine Extract of Sumiyoshi Coal

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The chemical constitution of the petroleum ether soluble portion extracted from the pyridine extract of Sumiyoshi coal was studied by infra-red, ultra-violet and high resolution nuclear magnetic resonance spectroscopy. First, the petroleum ether extract was fractionated by liquid chromatography and separated into Fractions I to V. As a result of superimposing the separate spectroscopic analyses, it was shown that Fraction I consists of saturated hydrocarbons and Fraction II to V were aromatic compounds. The average molecular structure of each fraction was estimatted by elementary analysis, molecular weight and hydrogen distribution. As for the structural analysis of saturated hydrocarbon (Fraction I), the contents of the respective types of carbon grouping namely CH3, CH2, CH were estimated from the NMR analysis and elementary analysis. The numbers of naphthene rings were calculated based on their contents. The structural parameters of aromatic fractions of Fraction II to V were estimated by Williams' method which was originally applied to the structral analysis of petroleum fraction. The result of the structural analyses was as follows: the average molecular structure of Fraction I was naphthene with 4 to 5 rings, and Fraction II, III and V was alkyl benzene, alkyl naphthalene, and alkyl anthracene or alkyl phenanthrene derivatives respectively.
一般社団法人日本エネルギー学会の論文