Drying is a mass transfer process. All mass transfer processes involve moving mass from one location or phase to another. In the case of industrial powder drying, the liquid solvent to be removed is almost always water. This is typically done by applying heat, thus causing the water to evaporate.
Vacuum drying is a batch operation performed in an air-tight vessel. Using vacuum pumps, the pressure and humidity within the chamber are reduced. By lowering the atmospheric pressure within the chamber, the materials inside dry more quickly and at lower temperatures than in other types of industrial dryers. Because the temperatures are lower, vacuum drying is especially well-suited for drying heat-sensitive materials.
amixon® vacuum dryer models AMT and VMT dry their contents through contact with the indirectly heated walls. In this sense, vacuum drying is essentially contact drying in a vacuum.
Learn more about the vacuum drying process, its applications, and its advantages over other industrial drying techniques.