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Sublimation
All processes of sublimation pass by the same principle: A closed apparatus is used to establish certain temperature and pressure conditions so that the target compound will sublime. In this video the sublimation finger and the sublimation cone are presented. They have both connections for cooling liquids as well as a valve to apply reduced pressure to the system. The sublimation cone is presented in detail and sublimation with it is shown. The cone's advantage is its larger cooled surface which allows sublimation of greater amounts of substances. However, sublimations often require high temperatures and low pressures, which makes this purification process problematic and unsuitable for many compounds.