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1 Freeze drying or lyophilization is a drying method where the solvent is frozen prior to drying and is then sublimed, i.e., passed to the gas phase directly from the solid phase, below the melting point of the solvent.
Sublimation in the freeze drying process can be described simply as: 1  FREEZE - The product is completely frozen, usually in a vial, flask or tray. 2  VACUUM - The product is then placed under a deep vacuum, well below the triple point of water.  DRY â Heat energy is then added to the product causing the ice to sublime.