Common techniques: Büchner filtration

Laboratory techniques manual
Common techniques

Büchner Filtration


Figure 1 Büchner Filtration

Büchner filtration is used primarily to collect a desired solid, for instance, the collection of crystals in a recrystallization procedure. Büchner filtration is faster than gravity filtration, because the solvent or solution and air is forced through the filter paper by the application of a vacuum. The filter paper, is placed on the plate of the funnel, and the filter paper is moistened with a solvent to prevent initial leakage. The liquid to be filtered is poured into the funnel and drawn through the perforated plate by the vacuum.(see video below)

Last modified: Tuesday, 7 August 2012, 10:08 AM