A Simple Apparatus for Filtering Air-Sensitive Solids Sometimes there is a need to remove or separate an air-sensitive solid from a solution under an inert atmosphere. There is no convenient technique for this purpose, and we describe here a simple device, illustrated in part A of the figure. A septum is pierced by a double-tipped needle, after which the end is wrapped with Teflon" tape. A section of filter paper is then wrapped around the tip and attached with wire. To provide an example, we will describe the use of the apparatus (part A of figure) to remove oil from a hydride.
b double-tipped needle
wire
~ c f ~ otope n filter paper
A
0
C
A slurry of hydride and oil (0.5 g) was inkoduced under an inert atmaphere in the reaction flaskequipped with a stirring bar. Degassed anhydrous pentane is introduced with the syringe while the apparatus is kept above the level of the liquid (see part B of figure). After being stirred for 1min, the solution is removed by lowering the filter device below the level of the liquid (see part C of figure) and introducing pressure with an inert gas. The same device can be used for filtering and washing solids a t low temperature (by cooling the flask),and the filtration system can be cleaned easily. J. Cossy A. Feigenbaum Laboratoire de Photochimie U.E.R. Sciences B.P. 347.51062 Reims Cedex
France
Volume 61
Number 5
May 1984
453
