Rotary vacuum dryers offer clean, simple and
effective method of drying wet cake, powder and even slurry. Labor and
energy costs are minimal compared to tray dryers and product losses during
handling are also negligible. Additionally valuable organic solvents can be
conveniently condensed and recovered.
The drying in a rotary vacuum dryer is a batch operation under vacuum. It
is possible to dry heat sensitive materials at well below boiling points of
water and solvents. Drying time depends on material being dried, amount of
solvent or water to be removed, desired final moisture content, permissible
jacket temperature etc. The dryer is available in sizes ranging from 100
liters to 20,000 liters gross volume. The volume of wet material loaded into
the dryer is usually restricted to 50% of gross volume.
- Rotary Vacuum Dryers (RVD) also known as Vanuleuth Dryer, is a
cylindrical jacketed vessel with a central agitator having specially
designed blades. The blades of this Rotary Vacuum Paddle Dryer (RVPD)
are so designed that they sweep the entire internal surface and at the
same time turn the material so that all the particles are come in
contact with the heated surface.
- The central agitator shaft is supported on the two end bearings
housed in bearing housing in such a way that the alignment remains
always intact. This central agitator is driven by means of a Motor &
Gear box through the bull Gear.
- Cooling could also be provided by cold water / brine refrigerant
through the jacket.
- The horizontal shell is jacketed to heat the shell with steam / hot
water or any other thermal fluid. Limpet coil is provided instead of
jacket if the heating media is fluid.
- A Dust Catcher consisting of bag filter is provided on the top to
prevent the losses of material particles after the drying process.
- A Condenser of adequate heating surface area is provided wherein the
evaporated vapors are condensed and these condensed vapors are then
collected in the receiver of suitable capacity, placed beneath the
- A Vacuum Pump of adequate capacity is provided & fitted to the
receiver of these rotary vacuum dryers to create the vacuum in the dryer
shell through the Receiver, Condenser and Dust Catcher.
These rotary vacuum dryer give drying, mixing and breaking effects
simultaneously. Wet cake or slurry is fed through charging door, while the
agitator is rotating in clockwise direction, vacuum is applied in the dryer
and heating media is circulated in the jacket. Evaporation of moisture takes
place under vacuum and vapors passes through the dust catcher into the
condenser, where it is condensed and collected in the receiver. Dried
material is discharged through discharge valve. The lump breaker rods are
provided to achieve good drying effect.
This is a high efficiency dryer unit used for drying of wet cake product
after filtration. This equipment can be used in drying process of various
Pharmaceuticals, Intermediate Compounds, Fine Chemicals, Chemicals, Agro
Chemicals, Pesticides, Insecticides, Dyes and Food Products.