Vacuum Filtration - Definition, Glossary, Details - OilgaeA filtration technique where suction is applied to the mixture of solid and liquid being filtered so as to pull the liquid through the filter. This technique is much faster than gravity filtration. Vacuum filtration usually involves the use of a vacuum filter flask, a filter trap, a water pump, and either a Buchner funnel or sintered glass crucible. The liquid mixture is poured into the filter (Buchner or sintered glass), the liquid is sucked down into the filter flask by the action of the water pump, and any excess liquid that overflows out of the filter flask is caught in the filter trap. The solid matter is left on the surface of the filter.Links
Vacuum filtration device: The vacuum filtration device has a disposable filter funnel and a disposable filtrate receptacle. The funnel and receptacle are used with a reusable base that is connected to a vacuum source. When the receptacle and funnel are mounted on the base the vacuum is applied through a connecting passage to the receptacle to draw the filtrate from the funnel into the receptacle.
Vacuum Filtration: When it is necessary to separate and save the solid phase that precipitates from a solution, suction filtration is commonly employed. This technique makes use of the fact that the laboratories are equipped with aspirators (left) -- a device associated with a water tap that permits access to a vacuum while water is flowing through it. This is a practical application of Bernoulli's principle, which describes the reduced pressure caused by a flowing fluid when it passes through a constriction.