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Pilot plant filters & filter dryers

Pilot plant nutsche filters, filter dryers

Pressofiltro® Series PF 5 - PF 500 Pilot plant

Pressofiltro® pilot units are multipurpose tools for pilot plant or laboratory applications as well as for small scale production facilities. Versatile use of the equipment, cGMP compliant design, containment, efficient and complete cleanability, complete discharge-ability, highest drying efficiency, process safety and monitoring, ease of validation and a compact design are important requirements for this type of equipment.

Pressofiltro® pilot nutsche filters and filter dryers designed to meet varied customer specifications. Customer specified options include single column support, support on a skid or conventional 3 leg design, hydraulically activated discharge valve or manually operated discharge port, active or passive isolators for sampling, product pack-off and heel removal, heel removal systems, microwave duty preparation, all electric versions, bayonet or C-clamp locking for filter bottom, etc.

 

 

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Inerting

Prior to feeding slurry into the agitated Nutsche filter or filter dryer the vessel interior is inerted by a controlled displacement of the oxygen containing atmosphere with Nitrogen. This procedure prevents the potential formation of an explosive atmosphere in the vessel interior.

Filling

Afbeelding: pf100-6000 filling

After inertization is completed the slurry is fed into the vessel.

Filtration

filtration

The slurry is filtered by pressurizing the vessel interior using Nitrogen and/or evacuating the area underneath the filter plate. Solids are retained by the filter cloth whereas the mother liquor passes thru the filter cake forming and thru the filter cloth and is discharged from the area underneath the filter plate.

Washing

Afbeelding: pf100-6000 washing

Once the mother liquor has been filtered off the cake washing step is initiated. 

Prior to displacement washing the filter cake surface is smoothed using the agitator to prevent cracks in the filter cake.

The washing liquid is evenly distributed over the entire filter cake surface using a wash ring with spray nozzles. By again pressurizing the vessel interior the washing liquid is forced thru the filter cake, displacing any remaining mother liquor and is discharged the same way as the mother liquor during the filtration.


In the reslurry washing process the washing liquid is added to the vessel and mixed with the filter cake using the agitator. By again pressurizing the vessel interior the washing liquid is forced thru the filter cake, displacing any remaining mother liquor and is discharged the same way as the mother liquor during the filtration.

Drying

Afbeelding: pf100-6000 drying

After completion of the washing process the drying process is initiated. For efficient drying the filter dryer is typically evacuated in steps and heated up at the same time. During the drying process the product is agitated. The filter dryer is maintained under vacuum and at the maximum allowable temperature for the product until the final required product humidity level is reached.

Cooling

Afbeelding: pf100-6000 cooling

After drying is completed the product is cooled down prior to discharging.

Discharging

Afbeelding: pf100-6000 discharging

The dried and cooled product is discharged thru the side discharge valve. The product is transported to the discharge valve or thru the side discharge port into the isolator using the agitator.

Cleaning

Afbeelding: pf100-6000 cleaning

Using spray balls a cleaning fluid is sprayed onto all product wetted internal surfaces for the internal cleaning of the equipment in between individual batches or for product change over. This provides for full and efficient cleaning of the filter dryer interior.

Technical data

Special properties for the customer’s benefit

  • calculation, design and manufacture in compliance with Pressure Equipment Directive 97/23/EG or/and ASME U-stamp as well as with cGMP and FDA guidelines
  • EG type examination certification 03ATEX0246X in accord with PED 94/9/EG or with UL-approved electrical components for operations in class 1, division 1 or 2, group C & D environment
  • double mechanical seal, externally interchangeable, gas-lubricated (lift-off), dry running contact (contacting slide surfaces) or liquid-lubricated
  • the tank’s lower section is fastened to a column for optimal access to filter plate, resp. dryer’s lower section
  • device built on skid, completely with hydraulic power unit or fastened to supporting column
  • sampler valve
  • pre-piping made of stainless steal, pre-wiring on terminal box made of stainless steal
  • CIP System

 

Options

  • additional heating with microwaves to reduce the drying process
  • available in steam sterilizable and/or aseptic designs, removal of the residual layer, DQ, IQ, OQ qualification
  • autonomic PLC control or connected to PMSX

 

Dryer
type
 		 Internal
Ø
mm		 Filter area
m²
 		 Cake volume
max.
l

Speed
max.
1/min

 Drive
kw
PF 5 200 0.03 3 100 0.75
PF 10 250 0.045 4.5 80 1.1
PF 25 300 0.07 8 70 1.5
PF 50 400 0.13 18 55 2.2
PF 100 500 0.20 32 50 4.0
PF 200 640 0.32 80 74 4.0
PF 250 700 0.38 115 70 5.5
PF 350 800 0.50 150 60 5.5
PF 500 S 875 0.60 180 52 7.5
PF 500 955 0.70 210 46 7.5
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Fields of application
Pharmaceutical
Pharmaceutical
Chemical
Chemical
Fine chemicals
Fine chemicals