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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.
What is SPRAY DRYING? Rapid drying of a solution or suspension by spraying into a flow of hot gas, the resultant powder being separated by a cyclone. Used to prepare powdered milk, detergent, fertilizer etc.