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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.
Freeze drying is the modern method of making instant coffee granules. Itâs been used for around 45 years, though freeze drying has been around for use in laboratories far longer. Freeze drying works by removing water vapour under vacuum. As I understand it, instant coffee is made by making a very strong solution of coffee and then evaporating the water. The alternative to freeze drying is using heat to evaporate the water. Freeze drying is supposed to keep the coffee flavours far better than heat evaporation.