Robert J. Hanrahan
Separatory Funnel for Successive
University of Florida
Gainesville, Florida
Extraction of the Heavier Phase
A conventional separatory funnel is inconvenient for re-extraction of the heavier phase, which must be successively run out and returned to the bulb. We have devised a double separatory funnel (see the drawing) which overcomes this inconvenience; it is merely necessary to run the heavy phase back and forth between the two bulbs. The angle of approximately 90' between the two bulbs and the indicated placement of the necks are necessary to allow free flowing of liquid without trapping air while still permitting the utilization of almost the entire volume of the bulbs. Either a solid brace or a vent tube with stopcock may join the necks. As with any separatory funnel, the pear shaped bulbs must taper all the way down to the stopcock if trapping of a small portion of light phase is to he avoided. More versatility could be achieved by extending the principle to three bulbs and a three-way stopcock, but with some unwieldiness resulting. Although the double reparatory funnel was devised for experiments where
radioactive contamination, loss of material, or similar problems are involved, it should also prove useful in conventional preparative and analytical procedures. Acknowledy-ment. Mr. W. C. Blasky of our laboratory made some suggestions concerning the design and fabricated the first models of the double separatory funnel.
Double seporotory funnel for svcceulva extraction of the heavier phase,
Volume 40, Number 2, February 1963
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