Camphor can easily be purified by the process of sublimation. Sublimation is used for separating substances with on heating change directly into vapour. Camphor gets directly converted to its gaseous state, leaving the salt behind.
Camphor is separated from NaCl by Sublimation. On heating, camphor is collected on the inner surface of the inverted funnel while NaCl left in the dish. When a mixture of NaCl and camphor is heated, camphor sublimes and its vapours are obtained.