The Reaction of Coals with Hydrogen Atoms at High Temperature

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Other Title
  • 高温での石炭と水素原子との反応

Abstract

Reactions between coals (Taiheiyo, Hongai) and hydrogen atoms were investigated in a discharge flow apparatus at various temperatures (Table 1) under 133 Pa. Coals were first heated under helium until dry distillation was substantially completed, and then irradiated with hydrogen atoms. The specific gravity, refractive index (Table 2), 1H-NMR spectra (Fig.1), distillation behavior (Fig.2), Fl-MS spectrum (Fig.3) and gas chromatogram- were determined on liquid products (coal liquid) obtained by runs A∼C in Table 1. Coal liquid C was found to contain a larger amount of alkenes and aromatic compounds compared with those of A, although the ranges of their carbon numbers were nearly the same. The results of the reactions at higher temperature are summarized in Tables 4 and 5. The higher temperature of the heat treatment lowered the reactivity (A; B; D). The higher reaction temperature increased the proportion of the gaseous products (D; E; F). These results are closely related to the O-content and H/C atomic ratio of the heat-treated coals (Table 3). The main product of the gaseous hydrocarbons was mostly methane. No acetylene was detected. Products of the reaction at 600°C comprised about 90% of gaseous hydrocarbons rich in methane and ethylene, while coal liquid (10% of the products) consisted of a great amount of benzene, toluene and xylenes (Table 6).

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1985 (5), 925-930, 1985-05-10

    The Chemical Society of Japan

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