Industrial Dryer

DUEX Vacuum Freeze Lyophilizer  uses various methods to freeze the product. Freezing can be done in a freezer, a chilled bath (shell freezer), or on a shelf in the Vacuum Freeze Lyophilizer . The Vacuum Freeze Lyophilizer  cools the material below its triple point to ensure that sublimation, rather than melting, will occur. This preserves the material’s physical form.

A Vacuum Freeze Lyophilizer  most easily freeze dries large ice crystals, which can be produced by slow freezing or annealing. However, with biological materials, when crystals are too large they may break the cell walls, and that leads to less-than-ideal freeze drying results. To prevent this, the freezing is done rapidly. For materials that tend to precipitate, annealing can be used. This process involves fast freezing, then raising the product temperature to allow the crystals to grow.

Primary Drying (Sublimation) Phase

Vacuum Freeze Lyophilizer ’s second phase is primary drying (sublimation), in which the pressure is lowered and heat is added to the material in order for the water to sublimate. The Vacuum Freeze Lyophilizer ’s vacuum speeds sublimation. The Vacuum Freeze Lyophilizer ’s cold condenser provides a surface for the water vapor to adhere and solidify. The condenser also protects the vacuum pump from the water vapor.  About 95% of the water in the material is removed in this phase. Primary drying can be a slow process. Too much heat can alter the structure of the material.

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