1824. ---------------. [KOCH, H., AND HILBERATH, F.] [Suitable Apparatus for Fractional Distillation at Low Temperature.] Brennstoff-Chem., vol. 21, 1940, pp. 197-203; Chem. Abs., vol. 35, 1941, p. 7239.

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Literature Abstracts

Previously proposed apparatus are described briefly with reference data. The fact that the new column, which is described in detail, employs complete condensation permits recovery of distillates of ether liquid or gas at will. Arrangement of the column head and accessories allows desired reflux conditions and the maintenance of constant operating adjustments. The possibility of overheating or overcooling of the temperature indicators is prevented, and progress of the fractionation is followed easily by true temperature measurement with thermometer or thermocouple. Manipulation of the column, with a glass tube spiral as exchanger, is described. Efficiency is demonstrated by separation of mixtures of propene-propane, isobutane-butane, and motor-fuel oil. In addition to the form of column for preparation purposes, an analytical arrangement also is described. Illustrated.