Purification of organic compounds sublimation

SUBLIMATION

Some substances when heated, pass directly from the

solid to the vapour state without melting. The vapours

when cooled given back the solid substance. This

process known as sublimation is very helpful in

separating volatile from non-volatile solid. It is,

however, of limited application as only a few

substances like a naphthalene, camphor and benzoic

acid can be purified by this process.