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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.
1 Supercritical drying (superheated steam drying) involves steam drying of products containing water. 2  This process is feasible because water in the product is boiled off, and joined with the drying medium, increasing its flow.