Abstract
IN the course of experiments on the solubility (or dispersibility) of coals in organic solvents, it was observed that the pyridine-insoluble (α) fraction of a Northumberland coal (82·6 per cent carbon and 5·1 per cent hydrogen on the dry ash-free basis) became partially dissolved (or dispersed) when suspended in pure dry pyridine and exposed to supersonic waves (c. 25 kc./sec.) for 15 min. When the extract thus formed was recovered by removal of the solvent under reduced pressure in an atmosphere of dry oxygen-free nitrogen, it formed a black, free-running solid that was only very slightly soluble in boiling pyridine. The elementary composition of this material was practically identical with that of the original α-fraction, both being reduced to the pure coal basis.
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References
Kiebler, M. W., Carnegie Inst. Contrib. No. 87 (1942).
Bangham, D. H., Introductory Lecture, Conf. Ultraflne Structure of Coals and Cokes (BCURA, 1944).
Dryden, I. G. C., Nature, 162, 959 (1948). Berkowitz, N. (unpublished work).
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BERKOWITZ, N. Dispersibility of Coal in a Supersonic Field. Nature 163, 809–810 (1949). https://doi.org/10.1038/163809b0
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DOI: https://doi.org/10.1038/163809b0
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