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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.
Principles of Freeze Drying The freeze drying process consists of three stages:prefreezing, primary drying, and secondary drying.Prefreezing: Since freeze drying is a change in statefrom the solid phase to the gaseous phase, material to befreeze dried must first be adequately prefrozen.