Caution! Methylene chloride is toxic and a possible carcinogen. Minimize exposure to its
vapors by working in the fume hood. Use double gloves when handling methylene
chloride.
Purification by sublimation
First we need to convert your filter flask into a sublimator. Place a filter adaptor on top of
the flask and insert inside it a centrifuge tube (see figure 7). Place the flask inside a sand
bath (don’t forget to secure it with clamp) and connect the side arm to the vacuum line
(don’t forget the “water trap”). Gently turn on the vacuum and fill the inner centrifuge