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commercial refrigeration vacuum freeze drying process
commercial refrigeration vacuum freeze drying process
commercial refrigeration vacuum freeze drying process food vacuum freeze drying process.
(1) Pre-freezing stage. Freeze the free water in the material into ice to prepare for the drying stage. Since the material is in a frozen state, the shape of the material after freeze-drying can remain basically the same as before drying, and it can also prevent irreversible changes such as foaming, concentration, shrinkage and solute movement of the material during vacuum drying. At the same time, it can prevent the materials from being heated during the drying process and the nutrients in them are destroyed by microorganisms.
(2) Sublimation drying stage (first stage drying). This stage is mainly to sublimate the free water in the material. Since water needs to absorb heat to transform from solid to gas, the material needs to be heated at this stage to allow the sublimation process to proceed. For different materials, the required heat is also different. The parameters involved in this stage are sublimation temperature, sublimation rate and heating method.
(3) Analyze the drying stage (the second stage of drying). Since the first stage drying removes about 90% of the total water, about 10% of the combined water that was not dried in the first stage should be sublimated out of the material in this stage. Because the adsorption energy of adsorbed water is high, it is necessary to provide high enough energy to make them resolved from the adsorption, so the heating temperature of the material at this stage must be high enough (as long as it is controlled below the disintegration temperature). At the same time, in order to make the desorbed water vapor have sufficient driving force to escape the material, a relatively large vapor pressure must be formed inside and outside the material, so the freeze-drying box should be high vacuum at this stage.
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