AGITATED NUTSCHE FILTER DRYER (ANFD)

    Agitated Filter is a closed vessel designed to separate solid and liquid by filtration under pressure or vacuum. The closed operation ensures odorless, contamination free and nonpolluting working conditions maintaining product purity and hygiene. The advanced technology of agitation and hydraulics used in the equipment makes it versatile and user friendly. The resulting wet cake can be reslurried and washed thoroughly with water or solvents unlike in” NUTSCHE” type filters or centrifuges. Wash liquid quantity can be controlled and recycled, reducing effluent load. The discharge of wet cake is automatic. If the process demands filtration in chilled or hot condition, it is also possible. Drying of wet cake is also possible when drying features are incorporated. Slurry is fed into the top compartment from where filtrate passes into the lower chamber en route to receiver. it consists of a cylindrical shell with welded dished end at the top and either a flanged and bolted dished end or a welded dished end / flat welded end at the bottom depending on process/customer’s requirements. The vessel is divided into two compartments by means of a perforated plate, provided with suitable filter cloth or porous tiles. An agitator of unique design is provided inside the vessel. This agitator can perform multifarious activities by manipulating its movement of vertical and rotational directions simultaneously, by push buttons switches/PLC. The filter is capable of operating under either pressure or vacuum or a combination of both. The equipment is functionally safe and easy to operate. It can carry out various phase of process operations, viz: Crystallization , filtration, extraction, Discoloration, Washing and drying. It has multi- functional utility, saves on power, labor, floor space, material wastage and time. The filter dryer has wide field of applications in chemical, pharmaceutical, Agro chemicals, fine chemicals, and food industries.

    The movements of agitator are:

    Clock wise rotation: For smoothing cake surface and compacting it during filtration.
    Anticlock wise rotation: For stirring near filter media to keep it clear of sedimentation, reslurring while washing and atomized discharging.
    Upward movements: Operated by hydraulic cylinders at constant speed to assist mixing.
    Down ward movement: Operated by hydraulic cylinders with variable speed to assist squeezing and discharge.

    Operation of ANFD:

    Slurry is feed into the top compartment from where filtrate passes into the lower chamber en route to receiver. Solids are deposited on the filtering media in the top compartment and take the shape of cake of a uniform thickness.
    The agitator pushes the solid content in the slurry upwards by keeping it under suspension till maximum possible filtrate passes through the filter bed. This reduces time and increase productivity. It then seals the cracks in the cake, which develop after most of the filtrate has passed through, by smoothening the top cracks surface which appear in the cake, leaving behind low residual moisture 10 to 20% less as compared to other conventional filters. This results in energy saving in drying process at least by 40%.It also squeezes out some of the moisture in the cake by slightly pressing the cake uniformly with the help of specially designed blades.
    After the final wash, filtration and compression, the heating medium is fed into the limpet/jacket and the chamber below filter plate as well as Hollow shaft and Hallow Blade .The stirrer blades are lowered and the cake mass is agitated during the drying stage. The vapour can be removed under vacuum applied to the filter. Drying can be enhanced by purging a hot gas through cake.
    After washing and removal of wash liquor, the cake can be discharged through a quick opening side discharge door, by rotating and lowering agitator in the discharge direction. No manual handling is required.

    Advantages:

    The filter works as a completely closed system, eliminating any possibility of atmospheric pollution from toxic fumes / obnoxious smell generated from the slurry.
    1. Very high solvent recovery is possible.
    2. Explosion or fire hazard on account of spillage is eliminated.
    3. Manpower saving. All operations can be handled by a single unskilled person with little training.
    4. Very effective washing of cake due to re-slurring resulting in thorough particulate washing and reduces number of washes, and volume of wash liquor.
    5. Possibility of doing reaction filtration, washing and distillation in the same equipment. In some cases drying operation can also be carried out in the same equipment. Heat transfer surface can be provided by means of a jacket or limpet coils on the vessel walls. Indirect heating can be provided on the filter base and agitator.
    6. Available in special construction for sterile applications with high standard of particulate purity.

    Materials of Constructions:

    1. Carbon Steel
    2. Stainless Steel
    3. Nickel/Nickel Alloys
    4. Super Stainless Steels
    5. Hastelloy.

    Note :

    Sizing, selection of configuration, M.O.C’s, methodology of filtration etc. are based on material characteristics. Magtech Process Equipments Pvt. Ltd. has vast experience and Pilot Plant facilities. These are used for proper selection and design based on specific application requirements. Suitable linings of FRP / FRV, Rubber, Acid-resistant bricks and tiles or corrosion-resistant fluorocarbons can be offered.

    Configurations Available:

    1.) Pressure-Cum-Vacuum filter.
    2.) Bottom detachable arrangement for ease of cleaning/ cloth fixing.
    3.) Electromechanical drive and Hydraulic Shaft lift.
    4.) Hydraulic discharge valve.
    5.) GMP Models for clean room applications.
    6.) Filter-Cum- Dryer for drying of wet cakes.
    7.) Different stirrer designs based on physical characteristics of materials.

    Model No. MTP PILOT MTP 1000 MTP 2000 MTP 3000 MTP 4000 MTP 5000 MTP 6000 MTP 7000
    Working Cap. (ltrs.) 500 1000 2000 3000 4000 5000 6000 7000
    Filtrring Area(Sq.m.) 0.68 1.02 1.82 2.7 500 3.2 4.7 5.7
    RPM 20 20 20 15 12 12 12 10
    Motaor H.P. Rotary 5 5 7.5 7.5 10 12.5 15 15
    Vertical 1 1 1 1 1 1 1 1
    Internal dia.(mm) 1000 1200 1600 2000 2200 2600 2800 3000
    Over Height(mm.) 3400 3600 3800 4100 4300 4500 4800 5000

    The above dimensions are only indicative. Final choice will depend upon the operating parameters required based on material characteristics. Sizes above 20000 liters can also be offered.

Magtech Process Equipments Pvt. Ltd.

Plot No. 320-321, Ecotech 1 Extension, Greater
Noida, Gautam Budh Nagar-201306 ( U. P.) India.



Magtech Process Equipments Pvt. Ltd
Technocrats in Filtration & Drying System
For Api,Pharameaceutical & Chemical industry
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