Chemical Structure of Heavy Oil Derived from Coal Hydrogenation by Mass Spectroscopy
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Heavy oil derived from hydrogenolysis of Hiawatha, Utah, coal was separated by dual packed silica alumina liquid chromatography in accordance with the respective hydrocarbon types and each compound type was fractionated by gel permeation chromatography by the magnitude of their molecular size. It may be assumed that the molecular ion sensitivity coefficient for low-voltage mass analyses are not so largely different among components constituting the respective LC-GPC subfractions inasmuch as the structure of compound types and carbon numbers of alip hatic substitution are limited. Therefore, the structural analyses of GPC subfrac-tions from Fr-D-1 to Fr-D-7 of diaromatic compound were investigated by gas chromatography-mass spectrometry of a low resolution and low energy voltage (10eV) method, and by direct injection for higher molecular weight GPC subfractions eluted earlier. Mass spectra were measured with the integrating multiscan technique. Integrated mass spectra of molecular ion calculated by a computer were dealt with to esimate the hydrocarbon type and carbon numbers of alkyl groups substituted on the basis of Z values which indicates the deficiency of hydrogen in the compounds.<BR>From these results, it was shown that Fr-D-2 to Fr-D-7 consist mainly of homologous naphthalene derivatives with less amounts of mono-and triaromatic ring series. With regard to the respective type of naphthalen derivatives constituting each LC-GPC subfraction, the carbon number of alkyl substitution was found to decrease gradually with the increasing GPC fraction numbers from Fr-D-2 to Fr-D-7. For carbon numbers of alkyl substitution of the respective types of naphthalene de-rivatives, alkylnaphthalene series were found to have a range of 0 to 21, 0 to 18 for mononaphthenonaphthalene, 0 to 13 for dinaphthenonaphthalene, 0 to 8 for trinaphthenonaphthalene, respectively.
- 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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