Rotary Vacuum Paddle Dryer (RVPD)
Vacuum Drying is the most-efficient way to obtain a dry powder starting from filter or centrifuge cake. Rotary vacuum paddle dryer(RVPD) is one of this type, it is a closed system in which hot water, steam or hot fluid is used as a heating medium in the jacket, in the hallow paddle and in the hallow shaft, dust collector, condenser, receiver and vacuum pump are part of the system the continuous agitation by means of heated rotating paddles and minimum clearance between scrapers and heated walls provide a good heat transfer to the wet feed, this results in the solvent/moisture evaporating off and renders the wet material dry to the required degree. The vapors formed are removed by means of vacuum, absence of large air flows virtually eliminates dust problem and also the energy consumption remains low.
Rotary Vacuum Dryers can handle materials ranging from slurries to solid shapes, granular, crystalline or fibrous solids. Specific example include centrifuged solid, pharmaceuticals, starch, pigments, rayon staple, synthetic rubber, etc.