Rotary vacuum dryer is a cylindrical or cone vessel integrated with jacketed or limpet coil and rotated by a hollow shaft. Basically this is used for a batch operation plant. The complete drying of the product is done by combination process of under vacuum, stirring / agitation and consistent heating is through a jacket. It is an efficient method that offers a drying of the slurry pro... https://www.growmechanical.com/what-is-a-rotary-vacuum-dryer-rvd-types/