Abstract
IN the course of recent studies of the effect of solvents on bituminous coals, a number of solvents have been found to share with pyridine and with ethylene diamine1 the property of extracting a considerable quantity of coal at atmospheric temperatures. The difference between these and other solvents is sufficiently marked to warrant their designation as specific solvents for coal. The main types of specific solvent appear to be : (1) aliphatic compounds containing at least one primary amino group ; (2) aromatic compounds containing at least one primary amino group attached to an aliphatic side-chain ; (3) certain heterocyclic nitrogen compounds, such as pyridine, piperidine, morpholine (but not piperazine or pyrrole).
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References
Dryden, I. G. C., Nature, [162, 959 (1948)].
Losikov, B. V., Izvest. Vsesoynz. Teplotekh. Inst., 14, 26 (1941).
For example, Bakes, Fuel Research Technical Paper No. 37 (H.M. Stationery Office, 1933). Usznetzov, 1935 (see Fuel, 16, 114; 1937). Agde and Hubertus, Braunkohlen Archiv, No. 46, 3 (1936).
Kiebler, M. W., Indust. Eng. Chem., 32, 1389 (1940). See Lowry, "Chemistry of Coal Utilisation", 1, 737.
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DRYDEN, I. Specific Solvents for Lower Rank Bituminous Coals. Nature 163, 141 (1949). https://doi.org/10.1038/163141a0
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DOI: https://doi.org/10.1038/163141a0
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