What is Buchner funnel and what size pump for it?

A Büchner funnel is a specialized device used to filter mixtures of liquids and solids. It consists of two main parts: an upper part, called the filter funnel, and a lower part with a perforated or porous partition that separates the liquid from the solids. The principle of operation of a Buchner funnel is based on creating a pressure difference between the upper and lower parts. Under the influence of a vacuum created by a special pump, the liquid passes through the filter material, which leaves the solids on the surface of the septum.

What size pump for Büchner funnel?

Choosing the right size pump for a Büchner funnel is critical to the efficient operation of this instrument. A pump that is too weak may not provide sufficient vacuum, resulting in slow filtration and incomplete liquid removal. On the other hand, a pump that is too powerful may cause over-pumping, which will damage the filter media and reduce the quality of the result.

To identify the appropriate pump size, consider the volume of the filter funnel, the type of filter media used, and the liquid characteristics. Manufacturers of Büchner funnels usually provide recommendations for small vacuum pump choice, depending on the funnel model and its intended use.