Rotary vacuum dryer is the parallel cylindrical jacketed casing, incorporated with hollow agitator. It can move in close clearance. It allows for simple drying and provides an effective method of drying. It is suited to work on wet cakes as well as slurries. Rotary vacuum dryer is made to provide clean, effective and simple technique of drying slurries, filtered/centrifuged wet cakes and wet powders. Rotary vacuum dryer can dry the heat sensitive materials even to a reduced LOD levels.