DNFD Nutsche Filter Dryers are versatile, multipurpose machines wherein the following operations can be performed:
Filtration. It’s due to a process driven by pressure difference ∆P between the two sides of the filtering sheet. Special agitator smoothing movement allows to maintain ∆P also when the cake has already a low liquid percentage. In this way the filtration process reaches a dryness higher than other standard filters, indeed the final squeezed cake is comparable to that obtained by centrifuges.
Washing. Through several cycles of re-slurry and filtration, the machine allows you to wash the product with a suitable solvent and in a more effective way. This process is led by a clockwise agitator movement.
Vacuum drying. After the end of the last filtration the product can be vacuum-dried by means of both bottom and side vessel heating while the chamber is under vacuum. During this step the agitator rotates in counter-clockwise direction.
In some cases it’s also possible to blow the product with an inert suitable dry hot gas that can be fed through the bottom of the machine.
Automatic discharge of dried product. Once the product has reached the required dryness level, it is automatically discharged through the side discharge valve.
Because multipurpose machines, Nutsche Filter Dryers greatly improve the product purity and minimize safety and environment problem of manual transport of chemical ingredients.
Application Fields. DNFD is suitable for multi-product or mono-product application accomplished in batch process, such as:
• Pharmaceutical intermediates
• Fine chemicals
• Dye stuff
• Chemical Intermediates
• Food industry
• Inorganic salt
• All fields where the crystals of suspension are the product to be recovered.
• Pharmaceutical, for final oral dosage form pharmaceuticals
• Sterile, for final injectable dosage form pharmaceuticals
• High purity of product
• Optimization of filtration and drying process
• Easy operation
• Low investment & maintenance cost
• Research & development