Vacuum Filtration

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A simple technique for removing a solid-phase particle from a liquid phase. Nanosized particles should be washed via centrifugation instead.

Standard vacuum filtration setup

Equipment

People often use an alumina vacuum flask with a rubber gasket, and a Erlenmeyer flask with a vacuum port. This can be hooked up to a laboratory vacuum line. Common laboratory filters are made of paper, but alternative filter materials include Nylon, polypropylene, and PVDF.

Simple Procedure

Assemble the vacuum filter assembly. Wet the filter with solvent first, then add the mixture to be flask.

When using a paper filter, it is critical to fully dry the filter paper before attempting to remove the filtered product, or paper fibers can detach into the product. Paper filters should be dried at 60 degrees C to prevent charring of the filter paper.