Conical Screw Vacuum Dryer
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The Vrieco-Nauta® conical screw vacuum dryer is a universal batch dryer suitable for drying powders, granules, pastes and viscous slurries, especially when products are heat sensitive, contain solvents and are toxic or explosive.
With over a thousand active units in the market Vrieco-Nauta® conical screw vacuum dryer technology has for over 50 years been considered a leader in the field of process technology.
It is capable of handling products that become heavy and sticky during drying and can be used for vacuum operations such as reaction/crystallisation, heating/cooling, sterilisation, liquid/solid separation and de-aeration and thermal processing including sterilisation.
The advantages of undertaking several processes in one vessel offer significant investment cost savings as well as savings on labour and space. The Vrieco-Nauta® conical screw vacuum dryer also offers:
- Efficient drying of loose powders to heavy pastes and viscous liquids
- Batch volumes ranging from 5 to 22 000 litres
- No segregation and no product degradation
- Full compliance with international standards (FDA, cGMP, EHEDG)
- Automated cleaning solutions with our patented CIP filter and CIP skids
- Sterile processing (SIP)
- Interchangeable screw agitator for dryers larger than 20 000 litres
The thermal energy needed for drying is introduced into the product through a steam/oil/water heated jacket which with efficient mixing distributes the heat through the product.
The vacuum inside the dryer allows vapour to be removed at low temperatures. The vapours are removed through a dust filter fitted on top of the vessel. A condenser fitted to the dryer is used to recover solvents.
Moisture content of the product can be controlled by monitoring the weight of condensate or using the Hosokawa sampler for taking samples from the product inside the dryer under vacuum. The Vrieco-Nauta® Conical Screw Vacuum Dryer offers excellent secondary drying up to ppm level.