Dispersibility of Coal in a Supersonic Field

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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

  1. 1

    Kiebler, M. W., Carnegie Inst. Contrib. No. 87 (1942).

  2. 2

    Bangham, D. H., Introductory Lecture, Conf. Ultraflne Structure of Coals and Cokes (BCURA, 1944).

  3. 3

    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 Berkowitz, N. (unpublished work).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) doi:10.1038/163809b0

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