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Agitated Filter is a closed vessel designed to separate solid and liquid by filtration under pressure or vacuum. The closed operation ensures odorless. Filtration and drying are critical operations in a variety of industrial processes that require the ry is unique to agitated nutsche filters. Agitated. Nutsche Filter &. Dryer (ANF/ANFD). NSI. E Q U I P M E N T S . Operation. Agitated Nutsche Filters are extensively used in Chemical,. Herbal.

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These cylinders are provided for vertical movement of the agitator, discharge product and sometimes detach the bottom to clean the filter before changing the product. The condition of the filter medium, cloth or mesh screen, must be done periodically to ensure that they are not damaged. The Nutsche Filter is the industrial version of the well known laboratory scale Buchner Funnel except that it is designed to operate under either on vacuum or pressure.

The agitator performs a number of operations through movement in axes both parallel and perpendicular to the shaft. For applications that require preservation of temperature the vessel may be double-walled or half-pipe jacketed to provide effective heat transfer to the product. Cake Washing In the washing stage a spray ring or connections on top of the cover introduce the wash liquid over the cake. Nutsche Filters are available in almost any operaton with the larger machines for a slurry filling batch of 25 m3 and a cake volume of 10 m3.

Views Read Edit View history. This may have a layout impact on the downstream facility such as the conveyor that handles the product to storage. They are manufactured as agitated Nutsche filter dryers ANFD’S for the filtration and drying in the same unit of active pharmaceutical ingredients API and chemical compounds.

The filter floor consists of a densely perforated plate sufficiently strong to hold the cake weight and the pressure that is exerted on the cake’s surface. Present day Nutsche Filters are constructed to perform a multitude of tasks including reaction, filtration, cake washing and thermal drying on filfer single unit. A typical unit consists of a dished vessel with a perforated plate.

The Nutsche Filter requires attention operationn a regular basis to safety devices and automation features that accompany modern filters. Medium selection cannot be determined on a bench scale leaf test and it is only pilot testing that can establish long term effects such as medium blinding and fluctuations in the feed properties.


The vessel can be made completely leak-proof for vacuum or pressure service. The selection depends entirely on the characteristics of the solids, the liquid and the appropriate materials of construction. The Nutsche in its full configuration consists of four major components: In this system one of the hydraulic cylinders raises and lowers the paddles depending on the filtration cycle.

In this system two separate hydraulic arrangements raise and lower the paddle arms and the auger arms independently depending on the filtration cycle. The image below illustrates a cake that discharges in one piece from an Inverting Nutsche Filter that is not discussed in this section. As such these are very sophisticated machines with tight process control on parameters such as pressure, temperature and pH.

The ends must be cut in an angle to ensure a perfect seal. In their modern version they were developed in the early 80’s and the majority operates, usually under pressure, in batch oriented industries such as fine chemicals, dyes, pharmaceutics and pesticides. By using this site, you agree to the Terms of Use and Privacy Policy. Filtration The filter is charged with slurry and pressure is applied to displace the filtrate leaving the cake retained over the filter medium.

The auger system consists of two arms that rotate in one direction to perform re-slurrying as described for the paddle system. To take advantage of the drying ability of the Nutsche Filter it is worth considering the option of heating components such as the vessel, filter floor and paddles to enhance drying.

In addition two auger arms smoothen the cake by rotating in one direction and convey the cake towards the center for discharge by rotating in the opposite direction. From Wikipedia, the free encyclopedia. Hydraulic Cylinder for Spreader Arms. A multipurpose agitator is the unique feature of this system.

The swing type locking bolts that attach the head and cylinder on the smaller machines to the filter floor. The interlock that disables opening the cake discharge valve or opening when the vessel is still under pressure.

Agitated Nutsche Filter

Further reduction in cake moisture may be obtained by slowly rotating and lowering the paddle arms to scrape and delump the cake. Vacuum Drying Further reduction in cake moisture may be obtained by slowly rotating and lowering the paddle arms to scrape and delump the cake.

On some filters the cloth or woven mesh screen may be backwashed with water to dislodge and remove any cake residue that adhered to the medium after cake discharge.


When this happens the fines nutcshe the cake and slow down the cake formation so keeping the slurry in suspension with rotating arms during filtration assists in forming a homogeneous cake.

Washing efficiency may be further improved if air or gas are not allowed nutsvhe enter the cake in a multi-washing fiilter so the wash liquids always displace the solutions in a “piston” like manner. On smaller filters the head and cylinder are in one part that bolts to the filter floor featuring easy access to the filter medium.

Cake Discharge Once all the stages are completed the cake discharge valve opens and the paddle arms on the smaller machines or the auger arms on the larger ones are rotated and lowered to convey the dry cake towards the center. On the larger filters additional support to the plate is given by ribs between the vessel’s floor and the filter plate.

Agitated Nutsche Filter – Wikipedia

Agitated Nutsche filter ANF is a filtration technique used in applications such as dyepaintand pharmaceutical production [1] and waste water treatment.

The paddle arms are rotated in the opposite direction for cake smoothing to seal cracks prior to cake drying. These tasks are done by paddle or paddle and auger systems: The cleanliness of the filtrate sight glass that enables the inspection of filtrate clarity. The cake may be conveyed for discharge towards a piped chute that is positioned in the center of the vessel or towards an outlet positioned on the vessel’s cylinder just above the filter plate. Agitated Nutsche filters can be fabricated in agitater like Hastelloy C, C, stainless steelmild steeland mild steel with rubber nutscne as per service requirements.

This is done by resuspending the cake with the paddle arms for thorough mixing with the wash solution. Once all the stages are completed the cake discharge valve opens and the paddle arms on the smaller machines or the auger arms on the larger ones are rotated and lowered to convey the dry cake towards the center.

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