IR Spectra and the Aromaticities of Pyridine Extracts of Coals
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Petroleum ether insoluble and chloroform soluble parts (γ2 fractions) of pyridine extracts of Australian Moura and Chinese Tatung coals were separated into 6 parts by solvent extractions and liquid chromatography, respectively. These parts were analyzed by <SUP>1</SUP>H-, quantitative <SUP>13</SUP>C-NMR and IR spectrometry.<BR>A linear relationship exists between the ratio of optical densities of 1, 600 to 2, 920 cm<SUP>-1</SUP> bands in the IR spectrum, D1600/D2920, and the ratio of aromatic carbon atoms to alkyl hydrogen atoms in the average molecular structural parameters calculated from the <SUP>1</SUP>H-and <SUP>13</SUP>C-NMR spectra, <SUP>*</SUP>Ca/<SUP>*</SUP>Hal. Further, it has been found that this relationship applies in γ2 fractions of Japanese coals (Taiheiyo, Akabira, Yubari and Miike) and hydrogenated products of γ2 fraction of Nakayama lignite. Assuming that H/C molar ratio of alkyl groups is 2, the estimated values of aromaticities (fa) in original coals that are only slightly soluble in solvents can be calculated from the D1600/D2920 values and this linear relationship.These estimated aromaticities in the original coals agree fairly well with the values obtained by the other methods.
- 一般社団法人 日本エネルギー学会の論文
一般社団法人 日本エネルギー学会 | 論文
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