Production Scale Filter/Dryers

De Dietrich Process Systems range of production scale filter dryers are available up to 12.0 m², with multipurpose designs fit to handle a large range of applications. The two main types of production scale filters we offer are:

Traditional Rosenmund Filter/Dryers

DDPS Agitated Nutsche Filter/Dryers

Traditional Rosenmund Filter/Dryers

Filter/Dryer Product Description

Rosenmund Filter/Dryer

DDPS innovative technology combines the filter and dryer into a single unit, reducing product handling, contamination and capital cost. The filter/dryer performs a multitude of tasks including filtration, displacement or reslurry washing, vacuum or convection drying. It can discharge wet cake, slurry, liquid, or dried cake to less than 0.1% moisture.

Filter/Dryer Applications

Our range of filters and filter-dryers provides optimum performance and flexibility for demanding pilot, small-scale, and full production operations that require high efficiency in  washing and isolating solids. The side discharge valve is ideal for applications that involve multi-purpose production with frequent product changes or processes with stringent requirements for low-particle and sterile production.

Filter/Dryer Features

Our filters and filter/dryers have many features that make them the recognized industry leader including:

  • Agitator - Unique, 3-arm "S" blade is designed for low speed and high torque service for processing thick, wet or dry cakes. Angled and profiled blades for axial and radial mixing of soil. the tip speed is gentle of the crystals and eliminates the concern for shearing or crystal damage.
  • Universal Filter Media - The filter plate design allows the use of all types of filter media: cloth, single later metal screen, or multi-layer sintered metal.
  • Side Discharge Valve - This patented design features a metal-to-metal seals, eliminating the cleanability issues that can arise with the use of o-rings. The valve is FDA validated and will provide a pressure/vacuum-tight seal.
  • Heated Filter Plate - The all-welded design provides heat energy directly into the cake from the underside, allowing for heat transfer through all of the filter contact surfaces, for more efficient drying.
  • Controls - Our in-house controls engineers design both manual controls and more sophisticated PLC-based controls with both local and remote stations for pilot units.
  • Vessel Design - DDPS provides strict and rigid pharmaceutical vessel specifications.

Filter/Dryer Advantages

  • No operator contact
  • Emission-free
  • Closed system
  • Efficient washing and reslurry
  • Multipurpose
  • Easy to clean
  • Reduced production time and improved product quality

Filter/Dryer Specifications

  • Sizes from 0.2m² to 12.0m²
  • Pressures from full vacuum to 150 psig (10 bar)
  • Temperatures from -4°F (-20ºC) to 250°F (120ºC)


  • Gas Knife System – A unique and innovative solution that enables a total product discharge without manual intervention.
  • Various materials of construction including 316L stainless steel, Alloy 20, C-22 and others.
  • CIP/WIP and SIP systems
  • Heated agitator
  • Various main shaft seal designs

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DDPS Agitated Nutsche Filter/Dryers

Product Description

Agitated Nutsche Filter/Dryers

The 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.  Functionally safe and easy to operate, the agitated filter can carry out various phases of process operations including crystallization, filtration, extraction, decoloration, washing and drying.

Product Applications

The agitated nutsche filter/filter-dryer has a wide field of application in Chemical, Pharmaceutical, Agro Chemicals, Fine Chemicals and Food Industries. Sterilizable pharma versions are available for aseptic requirements.

Product Features

Our agitated filter is a cylindrical, vertical closed vessel made as per ASME pressure vessel code. The main features of the vessel include:

  • Agitator - specially designed, slow speed, robust agitator assembly features “S” type agitator blades that perform different movements designed to carry out specific operations:
      • Clockwise rotation: smoothing and compacting cake surface during filtration.
      • Counterclockwise rotation: stirring to prevent sedimentation near filter media, reslurrying while washing and automated discharging.
      • Upward movement: Assisting mixing.
      • Downward movement: Assisting squeezing and discharging.
  • Hydraulic Power Pack - for discharge valve operation and lowering/lifting of the agitator and detachable bottom.
  • Spray pipe/washing nozzles - provided inside the vessel for efficient washing of the wet cake and cleaning the vessel.
  • Control panel - ergonomically placed on the machine, housing all controls. One person can effectively monitor and control the entire process.

Agitated Filter/Dryer Process Advantages

  • Toxic and hazardous material can be processed.
  • Product purity maintained.
  • Product can be washed thoroughly and economically with solvents.
  • Blending of product possible before discharging.
  • Almost complete discharge possible.
  • Avoids cumbersome and repeated handling of process materials, saving on number of equipment used in filtration process (e.g. crystallizing vessel, intermediate hold vessel, reslurry vessel, etc. Streamlining process, thereby saving on power, labor, floor space, spillage and time.)
  • Large quantities can be processed faster than the conventional systems.
  • Higher cake thickness possible in the equipment for crystalline products.


  • Sizes ranging from 20 liters to 20,000 liters
  • Range of MOCs and also clad or polymer-lined construction - Stainless Steel and Hastelloy (C276, C-22 and C-2000), Rubber, PVDF and Teflon lined.


  • Complete automation with PLC
  • Drying of wet cake with incorporation of drying features
  • Temperature controlled filtration for chilled or hot conditions
  • Units for cGMP, Pharma, and Sterile applications
  • Barrier Isolation systems at the discharge port
  • All welded construction or bottom section trolley mounted and detachable.
  • Heated agitator, shell and bottom
  • Gaskets
  • Various mounting arrangements
  • Pilot plants

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