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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Agitated Nutsche Filter – Chempro Gujarat India

The condition of the filter medium, cloth or mesh screen, must be done periodically to ensure that they are not damaged. Hydraulic Cylinder for Spreader Arms. On operatlon larger filters additional support to the plate is given by ribs between the vessel’s floor and the filter plate.

Such filters have a filtration area of 15 m2 and are suitable for fast filtering slurries that produce readily 0.

There are two types of vessels: The major components to take care of are: The interlock that disables opening agitatde cake discharge valve or opening when the vessel is still under pressure. Nutsche Filters are available in almost any size with the larger machines for a slurry filling batch of 25 m3 and a cake volume of 10 m3. To view the components move mouse pointer over the menu. The Nutsche Filter requires attention on a regular basis to safety devices and automation features that accompany modern filters.

Agitated Nutsche filter ANF is a filtration technique used in applications such as dyepaintand pharmaceutical production [1] and waste water treatment. The auger system consists of two arms that rotate in one direction to perform re-slurrying as described for the paddle system. Opfration such these are very sophisticated machines with tight process control on parameters such as pressure, temperature and pH.

In their modern version they were developed in the early 80’s and the majority operates, usually under pressure, in batch oriented industries such agitatfd fine chemicals, dyes, pharmaceutics and pesticides.

It consists of an oil tank on which a pump is provided for circulating high-pressure oil through a control valve system and to hydraulic cylinders. When this happens agihated fines seal 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.

Agitated Nutsche Filter – Wikipedia

This page was last edited on 28 Novemberat 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. In the washing stage a spray ring or connections on top of the cover introduce the wash liquid over the cake.


In this system two separate hydraulic arrangements raise and lower the paddle arms and the auger arms independently depending on the filtration cycle. One of the advantages of the Nutsche Filter is the ability to smoothen the cake’s surface prior to applying spray wash so that the entire bed is washed evenly.

By using this site, you agree to the Terms of Use and Privacy Policy. Present day Nutsche Filters are constructed to perform a multitude of tasks including reaction, filtration, cake washing and thermal drying on a single unit. 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.

Click on the thumbnail to maximize the image. The filter tank must conform to an Unfired Pressure Vessel code, such as ASME, and checked periodically as required by the safety regulations. The entire vessel can be kept at the desired temperature by using a limpet jacket, jacketed bottom dish and stirrer blade and shaft through which heat transfer media can flow.

This arrangement has usually swing type fast locking bolts which are attached to the circumference of the filter floor.


Filtration The filter is charged with slurry and pressure is applied to displace the filtrate leaving the cake retained over the filter medium. Therefore, so that the idle time of the filter is kept to a minimum, sufficient holding volume is required for fast charging and emptying of the vessel. The ends must be cut in an angle to ensure a perfect seal. In this system one of the hydraulic cylinders raises and lowers the paddles depending on the filtration cycle.

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. Agitated Nutsche filters are used widely in the production processes of pharmaceutical, chemical and laboratory industries, among others. On the larger filters the cylindrical vessel is a separate part and the dished head cover is bolted on its top.

These tasks are done by paddle or paddle and auger systems: The operation of Nutsche Filters requires a complex manipulation of valves and hydraulics so present day installations filger always semi or fully automated. The control system for modern Nutsche Filters is very sophisticated since it activates and deactivates many components as may be seen in operatino section Operational Sequence. The cake may be conveyed for discharge towards a piped chute that is positioned operatuon the center of the vessel or towards an outlet positioned on the vessel’s cylinder just above the filter plate.


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.

Washing efficiency may be further improved if air or gas are not allowed to enter the cake in a multi-washing system so the wash liquids always displace the solutions in a nutsxhe like manner. A multipurpose agitator is the unique feature of this system. Further reduction in cake moisture may be obtained by slowly rotating and lowering the paddle arms to scrape and delump the cake.

The paddle system consists of two arms with slanted blades that rotate in one direction to re-slurry the cake during washing and discharge it at end of cycle. During resuspension the rotating arms are moving slowly downwards and are “shaving” the bed gradually layer after layer until the entire cake enters the slurry. The selection depends entirely on the characteristics of the solids, the liquid and the appropriate materials of construction.

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. 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.

The vessels are generally designed for an operating pressure of bars but higher pressures may be specified if required. 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. This is achieved by a special detector that monitors the surface of the cake for moisture and once air or gas start entering the bed a signal is transmitted to close the filtrate valve and reopen it once next washing commences.

The large diameter caulking gasket of the dished top head cover.

Agitated Nutsche Filter

To take advantage of the drying ability of the Nutsche Filter it is worth considering the option njtsche heating components such as the vessel, filter floor and paddles to enhance drying. A typical unit consists of a dished vessel with a perforated plate. Cake Washing In the washing stage a spray ring or connections on top of the cover introduce the wash liquid over the cake.