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Diagram of the vacuum filtration apparatus By flowing through the aspirator , water will suck out the air contained in the vacuum flask and the Büchner flask . There is therefore a difference in pressure between the exterior and the interior of the flasks : the contents of the Büchner funnel are sucked towards the vacuum flask.
This type has a tube at the bottom of the collection vessel to allow the organic solvent at the bottom to flow back into the reaction vessel. The water generated during the reaction floats on top of the organic phase. The entire volume must be drained to remove the water and the organic layer can be separated to be returned to the system.
The earliest water-cooled laboratory condenser was invented in 1771 by the Swedish-German chemist Christian Weigel (1748–1831). [6] Weigel's condenser consisted of two coaxial tin tubes, which were joined at their lower ends, forming a water jacket, and open at their upper ends. Cold water entered the jacket via an inlet at the bottom and ...
On top of the funnel-shaped part there is a cylinder with a fritted glass disc/perforated plate separating it from the funnel. The Hirsch funnel has a similar design; it is used similarly, but for smaller quantities of material. The main difference is that the plate of a Hirsch funnel is much smaller, and the walls of the funnel angle outward ...
This Wikipedia page provides a comprehensive list of boiling and freezing points for various solvents.
Condensers with forced-circulation cooling usually employ water as the cooling fluid. The flow may be open, from a tap to a sink, and driven only by the water pressure in the tap. Alternatively, a closed system may be used, in which the water is drawn by a pump from a tank, possibly refrigerated, and returned to it. Water-cooled condensers are ...
Schematic diagram of a cryogen-free, or dry, dilution refrigerator precooled by a two-stage pulse tube refrigerator, indicated by the dotted rectangle. A 3 He/ 4 He dilution refrigerator is a cryogenic device that provides continuous cooling to temperatures as low as 2 mK , with no moving parts in the low-temperature region.
Preferably this is done through a trap (see below), which is designed to prevent the sucking back of water from the aspirator into the Büchner flask. The purpose of applying a vacuum is to speed the filtration by providing a pressure differential across the filter medium that is greater than that produced by gravity alone.