Agitated Nutsche Filter

FILTER FEATURES:

• A typical unit consists of a dished vessel with a perforated plate.
• 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.
• The vessel can be made completely leak-proof for vacuum or pressure service.

POWER PACK:

• A power pack is a unit attached to the ANF's agitator system.
• 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.
• These cylinders are provided for vertical movement of the agitator.
• Operating pressure of the oil varies from 2 kg/cm² to *0 kg/cm²(**0 kPa to 8 MPa).

IMPORTANT POINTS:

• Slurry contents can be kept fluidized until most of the mother liquor is filtered through.
• When filtration is complete, the cake develops cracks causing upsets in the vacuum operation.
• This hinders removal of mother liquor.
• The agitator can be used to maintain a uniform cake.
• The cake can be washed after filtration by re-slurrying the cake.
• After washing, the mother liquor can be re-filtered.
• The cake can then be discharged by lowering the agitator and rotating it in such a manner that it brings all the cake towards the discharge port.

MATERIALS OF CONSTRUCTION:

• Agitated Nutsche Filters can be fabricated in materials like Hastelloy C***6, C**2, stainless steel, mild steel, and mild steel with rubber lining as per service requirements.
• Recently, Agitated Nutsche Filters have been fabricated out of polypropylene fiber-reinforced plastic (PPFRP).

AGITATOR:

• A multipurpose agitator is the unique feature of this system.
• The agitator performs a number of operations through movement in axes both parallel and perpendicular to the shaft.

ADVANTAGES:

• Vacuum or Pressure filtration possible.
• Inert gas atmosphere can be maintained.
• Minimal contamination of the cake.
• Very high solvent recovery.
• Considerable saving in manpower.
• Solvents are in closed systems, so no toxic vapors are let off in the atmosphere.
• Personal safety is maintained and heat transfer surfaces can be provided to maintain filtration temperature.