Schlenk frit
A Schlenk frit or reverse frit is a frit ( i.e. a laboratory device) for filtering under protective gas conditions ( Schlenk conditions ). It is therefore used to separate air- or water-sensitive suspensions into liquid and solid. A Schlenk frit consists of a glass tube with double-sided grinding , a remelted and filter taps on both sides (see figure).
use
Before use, the Schlenk frit must be baked out to remove traces of water. The Schlenk frit is placed on the product flask in a protective gas countercurrent, then the upper end is closed with a second flask. The structure is now rotated by 180 °. The liquid components of the raw product or the reaction mixture can now run through the filter, while the solid components remain.
A negative pressure can be generated in the lower piston for acceleration. However, this should not be so large that the solvent evaporates.
Individual evidence
- ↑ Jürgen Ackermann, Reinhold Tacke, Ulrich Wannagat , Ulrich Koke, Friedrich Meyer: Sila-Pharmaka, 181, derivatives of 1- (4-chlorophenyl) silacyclohexane with 3- (diethylamino) propyl and 2- (diethylamino) ethyl groups. In: Liebig's annals of chemistry. 1979, 1979, pp. 1915-1924, doi: 10.1002 / jlac.197919791128 .
- ↑ Jie Zhang, Alan M. Bond, Douglas R. MacFarlane, Stewart A. Forsyth, Jennifer M. Pringle, Andrew WA Mariotti, Abigail F. Glowinski, Anthony G. Wedd: Voltammetric Studies on the Reduction of Polyoxometalate Anions in Ionic Liquids. In: Inorganic Chemistry. 44, 2005, pp. 5123-5132, doi: 10.1021 / ic050032t .