Results are reported of an experimental study on the infra-red absorption of a coalification series of Japanese coals (vitranis).
The results are summarized as follows;
1.Hydroxyl group content decreases rapidly from a carbon content of 75 per cent, withincreasing carbon content.
2.Aliphatic C-Hhydrogen content increases with carbon content, and it becomes maximumat the carbon content of 84 per cent, beyond which this hydrogen content decreases rapidly.
3.Young coal had much -C-O-, -C-O-C- bonds, but these decrease mith coalification asstraight line.
4.An average spectrum of polycondensed aromatics at 11.75, 12.3, 13.3μ, becomes clear from a carbon content of 78 per cent.
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