Claisen flask

From Sciencemadness Wiki
Jump to: navigation, search

The Claisen flask or Claisen distillation flask is a special type of distillation flask used in several procedures, like vacuum distillation. It was invented by Rainer Ludwig Claisen.


The Claisen flask is generally used for reduced-pressure distillation. The flask was designed to reduce the probability of having to repeat the distillation, due to bumping of the boiling liquid. It is similar to a Würtz flask, though the distinctive feature of the Claisen flask is a U-shaped neck fused on the top of the flask. The flask itself is often round-bottom or pear-shaped. The U-shape (or bifurcation) is similar to that of a Claisen adapter, hence the name. This design makes it impossible for any splash of distilling liquid projected by bumping to reach the distillate.[1]

Some Claisen flasks have with a short fractionating column on the side arm.

Claisen flasks are made of good quality borosilicate glass.


Claisen flasks can be purchased from lab suppliers or online.


See also



Relevant Sciencemadness threads