Cannula Transfer

A cannula is a long double ended needle. It is used to transfer liquids from one vessel to another. Cannula should be kept in the oven, and purged with dinitrogen while still warm. The other end of the cannula is inserted into the receiving flask, and the stopcock closed so that the only flow of dinitrogen is through the cannula. A needle is placed in the receiving septum to vent, and the cannula is pushed into the liquid to be transferred. A cannula filter is a long needle with a piece of filter paper tightly wired onto a lipped glass attachment at one end. These can also be made with plain cannula. Ask a TA how to make one – it is better shown than described. One note – always use new septa for a cannula filtration. Old septa are prone to leak and slow down the procedure.

Citation

Agapie, Theodor. "Advanced Techniques of Synthesis and Analysis" 2010 Cal. Tech. <http://agapie.caltech.edu/Ch5b_2010/Ch5bmanual-2010.pdf>.