Reaction between hydrogen atoms and solvent treated coal specimens has been studied.
Domestic subbituminous coal, Taiheiyo, was first treated with 1: 1 mixture composed of carbon disulfide and pyridine at room temperature. The residual coal was heated at 200°C or 400°C in a stream of helium. The coal specimens so prepared were then subjected to the reaction with hydrogen atoms at 200°C and under 133Pa, using a conventional hydrogen discharge flow apparatus.
The reactivity of coal decreased by the solvent extraction. Specific gravity, refractive index,
1H-nmr spectra, and distillation behavior revealed, all in a consistent manner, that coal liquids obtained in the present study comprised mainly cycloalkanes of carbon numbers ranging from 6 to 22. They were, however, rich in higher boiling fractions, in comparison with those obtained by similar reaction with raw coal.
The average structure of the coal extracts was estimated to be tri- and/or tetrabutyl-benzene, while condensed ring aromatics was grown in the residual coal upon its heat treatment. The structural change in the coal specimens was well reflected on the properties of the coal liquids.
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