VOL.7, NO.3
CONTINUOUS EXTRACTOR FOR SOLIDS
593
A CONTINUOUS EXTRACTOR FOR SOLIDS JOHN H. GARDNER AND ZDWARD B. W. KERONE,W A S ~ N G T UNIVERSITY, ON ST.LOUIS. MISSOURI
A recent description of an automatic continuous percolator1 suggested a simple device for the continuous extraction of solids which can be readily and cheaply constructed by any one with a moderate knowledge of glassblowing. The only materials uecessary are a one-liter round bottom Pyrex flask, about two feet each of 15mm. and 7-mm. Pyrex tubing, and a little glass wool. The wide tube A is sealed to the flask B a t the neck and is bent a t right angles about 19 cm. from the flask. The smaller tube leads down from the bottom of the flask and is bent around t o connect with A at the point C, slightly above a line drawn through the center of the flask. A plug of glass wool is inserted a t D. For use, the extractor is connected with a flask of solvent and a condenser as shown and the flask B is about half-filled with the solid to !he extracted. The solvent is distilled into B, returning through D. The rate of flow can be regulated by loosening or tightening the glass wool plug. The efficiency is somewhat improved if the wide tube A is wrapped in asbestos. 'Jalade, Ann. fals., 22, 396405 (1929); Chem. Absts., 23, 5272 (Nov. 10, 1929); see Tms JOURNAL, 7, 685 (Mar., 1930).
