Merck Millipore® Amicon Stirred Ultrafiltration Cell

Overview

The Merck Millipore® Amicon Stirred Ultrafiltration Cell is a precision-engineered, benchtop membrane filtration device designed for controlled, reproducible ultrafiltration and microfiltration experiments under defined transmembrane pressure (TMP) and shear conditions. Operating on the principle of stirred-cell crossflow filtration, it minimizes concentration polarization and membrane fouling by integrating a magnetically driven stirring mechanism that ensures uniform sample mixing above the membrane surface. Since its commercial introduction in 1965, the Amicon stirred cell has served as a foundational tool in membrane science—widely adopted in academic research, industrial R&D, and regulatory-compliant process development for water treatment, desalination, pharmaceutical purification, and food & beverage applications. Its design conforms to established methodologies referenced in ASTM D4189 (Standard Test Method for Determining Membrane Filtration Performance), ISO 15713 (Water quality — Evaluation of membrane filtration performance), and USP (Water for Pharmaceutical Purposes), supporting method validation and GLP-aligned experimental workflows.

Key Features

• Two standard configurations: Standard Stirred Cell (rated up to 100 psi / 6.9 bar) and Solvent-Resistant Stirred Cell (rated up to 200 psi / 13.8 bar), enabling compatibility with aqueous and organic solvent-based feed streams.
• Ergonomic, tool-free assembly/disassembly system featuring integrated internal thread locking and pressure-actuated safety valve—eliminating external support frames and reducing operator error during setup.
• Leak-proof fluid path architecture with dual O-ring sealing at the cell body–lid interface and optimized inlet/outlet port geometry, validated per ISO 9001 manufacturing controls.
• Low-shear, PTFE-coated magnetic stir bar with balanced geometry to minimize membrane abrasion and extend membrane service life across repeated cycles.
• Modular membrane support platform accommodating standard 47 mm diameter membranes—including regenerated cellulose (RC), polyethersulfone (PES), nylon, and PVDF ultrafiltration and microfiltration membranes—with optional stainless steel or polypropylene retentate chambers.
• Comprehensive accessory ecosystem: pressure regulators, nitrogen gas manifolds, vacuum controllers, temperature-controlled jackets (–10 °C to +60 °C), and calibrated pressure transducers traceable to NIST standards.

Sample Compatibility & Compliance

The Amicon Stirred Ultrafiltration Cell supports a broad range of liquid samples including potable water, wastewater effluents, seawater concentrates, protein solutions, colloidal suspensions, and low-viscosity organic solvents. It is routinely employed in laboratories adhering to EPA Method 1623.1 (Cryptosporidium and Giardia detection), ISO 10707 (Microbial retention testing), and FDA guidance for membrane integrity testing in biopharmaceutical process validation. All wetted components comply with USP Class VI biological safety requirements and FDA 21 CFR Part 11–ready data acquisition when paired with compatible pressure and flow instrumentation.

Software & Data Management

While the Amicon cell operates as a standalone hardware platform, it integrates seamlessly with third-party data acquisition systems (e.g., LabVIEW, MATLAB, or custom Python-based DAQ platforms) via analog 0–5 V or 4–20 mA pressure and temperature output signals. Optional digital interfaces support time-stamped logging of TMP, permeate flux, and temperature—enabling audit-trail generation compliant with GMP/GLP documentation requirements. Merck provides detailed SOP templates and calibration protocols aligned with ISO/IEC 17025 accreditation criteria for testing laboratories.

Applications

• Determination of pure-water flux (PWF), solute rejection coefficients, and fouling resistance in membrane development studies.
• Benchmarking of novel membrane materials (e.g., graphene oxide, MOF-integrated, or thin-film composite membranes) under standardized hydraulic conditions.
• Process optimization for municipal wastewater reuse and brackish water desalination pilot studies.
• Concentration and buffer exchange of biomolecules (e.g., monoclonal antibodies, vaccines, enzymes) prior to analytical characterization.
• Validation of microbial retention efficiency for sterilizing-grade filters used in pharmaceutical water systems.
• Teaching modules in environmental engineering curricula covering mass transport, membrane hydraulics, and sustainable water treatment principles.

FAQ

What pressure ranges are supported by the Amicon Stirred Ultrafiltration Cell?

The Standard Stirred Cell is rated for operation up to 100 psi (6.9 bar); the Solvent-Resistant variant supports pressures up to 200 psi (13.8 bar). Both include built-in pressure relief mechanisms calibrated to ±2% accuracy.
Can I use this cell with organic solvents?

Yes—the Solvent-Resistant Stirred Cell features fluoropolymer seals and chemically inert wetted surfaces compatible with acetone, methanol, THF, and other common organic solvents. Compatibility verification per ASTM D471 is recommended for extended exposure.
Is membrane integrity testing possible with this system?

Absolutely. When coupled with a calibrated pressure decay test setup and bubble point measurement accessories, the cell supports ASTM F838-22 and ISO 16889 integrity protocols for hydrophilic and hydrophobic membranes.
How does the stirring mechanism affect membrane performance evaluation?

The variable-speed magnetic stirrer (0–1200 rpm) enables controlled shear stress application, allowing researchers to decouple hydraulic resistance from concentration polarization—a critical factor in accurate resistance-in-series modeling per Hermia’s fouling laws.
Are replacement parts and technical documentation available globally?

Yes. Merck Millipore maintains an international spare parts network with certified replacements for O-rings, stir bars, membrane supports, and pressure fittings. Digital user manuals, installation checklists, and compliance matrices are accessible via the Merck Product Portal under document ID AMICON-SC-UM-EN.