The Agitated Nutsche Filter Dryer (ANFD) is one of the most sophisticated and GMP-critical pieces of equipment in modern pharmaceutical API manufacturing. It combines three operations — pressure/vacuum filtration, cake washing, and vacuum drying — in a single, fully contained vessel without any product transfer between steps. This makes it indispensable for highly potent APIs, sterile intermediates, and multi-solvent synthesis processes.
As a trusted ANFD manufacturer, supplier and exporter in India, Bipin Pharma Equipment designs and manufactures GMP-compliant ANFDs for pharmaceutical and chemical industries worldwide.
The ANFD is a closed, pressure-vacuum vessel with a filter medium at the bottom (filter plate or sintered metal), a motor-driven agitator (anchor or filter agitator) inside the vessel, a vacuum/pressure system, and an integral solvent condenser. It processes wet API cake — received from a reactor or crystalliser — through filtration, washing, and drying without any open product transfer.
Multi-function closed system: filtration + cake washing + vacuum drying in one vessel. GMP-compliant, SS 316L, full containment.
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Alternative drying option for API granules and intermediates when ANFD is not required. GMP-compliant, 4 to 48 trays.
View Vacuum Tray Dryer →The wet slurry (API crystals suspended in mother liquor from the reactor or crystalliser) is transferred to the ANFD vessel under pressure or gravity through the top inlet. The vessel remains sealed throughout — no open transfers.
Pressure is applied from the top (compressed nitrogen or air) or vacuum is applied from below the filter medium. The mother liquor (solvent) passes through the filter plate and exits through the filtrate outlet. The API cake forms on the filter plate inside the vessel. The agitator prevents cake cracking and channels, ensuring uniform filtrate flow.
Wash solvent (fresh solvent or water) is introduced from the top onto the filter cake. The agitator gently redistributes the wash liquor across the entire cake surface, ensuring uniform washing and maximum removal of impurities, residual mother liquor, and reaction by-products. Multiple wash stages can be performed in the same vessel without opening.
After washing, the agitator is used to further compact and homogenise the cake. Vacuum or pressure deliquoring removes as much residual solvent as possible before the drying stage, minimising the thermal energy required for drying.
The vessel jacket is heated (hot water or steam) and vacuum is applied. The agitator continuously turns the cake, exposing fresh surface area to drying and preventing sintering or hard cake formation. Solvent vapour evaporated under vacuum passes through the vapour line to the condenser for recovery. Drying continues until the target LOD (Loss on Drying) or residual solvent level is achieved.
The dried API cake is discharged through the side discharge valve at the bottom of the vessel into a closed container. The discharge is GMP-compliant and contained — no open handling of potent material.
| Parameter | ANFD | Conventional (Filter Press + VTD) |
|---|---|---|
| Number of vessels | 1 (all in one) | 3 (filter + transfer vessel + dryer) |
| Open product transfers | None — fully closed | 2–3 open transfers |
| Operator exposure risk | Minimal (closed system) | Higher (open handling) |
| In-situ cake washing | Yes — multiple wash stages | Not possible in filter press |
| Solvent recovery | Yes — integral condenser | Only in vacuum dryer stage |
| Containment (OEB level) | High (OEB 3–5 suitable) | Low–Medium |
| Batch yield | Higher (zero product loss in transfer) | Lower (transfer losses) |
| Capital cost | High | Medium (two separate units) |
| Footprint | Compact (one unit) | Larger (two areas needed) |
| Industry / Application | Why ANFD? |
|---|---|
| Potent API manufacturing (OEB 3–5) | Full containment — no operator exposure |
| Controlled substance synthesis | Closed system meets regulatory requirements |
| Sterile API intermediates | Contamination-free processing |
| Multi-solvent reactions (IPA, acetone, MEK) | Integral condenser recovers all solvents |
| Complex molecule API with high purity spec | In-situ cake washing achieves purity without transfer |
| Low-temperature-sensitive API | Vacuum drying at mild temperature |
| Chemical fine chemicals and intermediates | Efficient, contained processing |
The ANFD is the equipment of choice for any pharmaceutical process involving potent, toxic, sterile, or solvent-intensive API synthesis. Its ability to filter, wash, and dry in a single closed system eliminates open product transfers, minimises contamination risk, maximises yield, and simplifies regulatory compliance. Contact Bipin Pharma Equipment for an ANFD specification and free quote tailored to your process.
Our technical team can recommend the right equipment — free consultation.
Send Enquiry Call: +91 88791 92449Manufacturer & exporter of GMP-compliant Agitated Nutsche Filter Dryers — SS 316L, full containment, integral condenser, DQ/IQ/OQ/PQ support. Contact us today.
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