Aug 14, 2026
Filtration is where most solid-liquid processes quietly lose yield, purity and time. An Agitated Glass Nutsche Filter solves that by combining reaction, crystallization, agitated washing, filtration and vacuum drying inside one transparent, corrosion-proof vessel — so the cake never leaves the system and the operator never loses sight of it. Xi'an Bioland Instrument Co., Ltd. builds every Agitated Glass Nutsche Filter around high-borosilicate glass, a standard PTFE sintered filter plate (stainless steel and titanium options available), large-diameter fast-filtration geometry, jacketed temperature control from -80°C to 200°C, and optional full explosion-proof and PLC automation. Add electric lifting, quick-release filter assemblies, GMP/FDA-compliant materials, CE and ISO certification, factory-direct pricing and complete OEM/ODM customization from 20 L to 100 L and beyond, and you have a pilot-ready platform rather than a laboratory accessory. This guide covers the operating practices that actually determine performance.
The single most common mistake operators make with an Agitated Glass Nutsche Filter is pulling maximum vacuum immediately. A steep initial differential compacts fines against the PTFE plate and blinds the medium within minutes. Best practice is a staged approach: begin gravity or gentle vacuum drainage at roughly -0.02 to -0.03 MPa until a supporting cake layer forms, then step up to -0.06 MPa, and only approach -0.09 MPa for the final deliquoring phase. Because the vessel is fully transparent, operators can watch the liquid level fall and the cake surface crack — visual cues that no stainless nutsche can offer. This visibility alone typically shortens cycle optimization from weeks to a few trial batches.
Bioland supplies each Agitated Glass Nutsche Filter with a PTFE sintered filter disc as standard, with stainless steel, titanium, filter cloth and membrane options in a range of pore ratings. Selection should follow the particle size distribution of your crystal slurry, not habit. Coarse, well-formed crystals filter beautifully on a 20–50 µm plate; needle-like or agglomerated fines demand a finer medium or a filter cloth overlay. Because the filter assembly on the Agitated Glass Nutsche Filter uses a quick-release design, changing media between development batches takes minutes, which is exactly what R&D teams need during screening.
Temperature is routinely underestimated. Mother liquor viscosity can double with a 20°C drop, halving flux. The jacketed Agitated Glass Nutsche Filter connected to a stainless-steel high-low temperature circulator holds the slurry at its optimal filtration temperature while still permitting controlled cooling crystallization beforehand. Bioland recommends a controlled cooling rate of 1–2°C per hour through the metastable zone to grow large, filterable crystals, then holding at the filtration setpoint. Uncontrolled crashing produces fines, and fines produce blinded plates — a problem no amount of vacuum will fix.
Cake height governs everything downstream. As a working rule, keep the cake in an Agitated Glass Nutsche Filter between 30% and 60% of the available height above the plate so the agitator can still smooth, wash and discharge it. Overfilling stalls washing efficiency and leaves the blade unable to reach the surface. Bioland's 20 L, 30 L, 50 L and 100 L models are dimensioned so that geometric ratios stay consistent, making scale-up from bench trials to pilot campaigns predictable rather than experimental.
The agitator in an Agitated Glass Nutsche Filter performs four distinct duties, and each needs a different setting. During reaction and crystallization it runs raised, at moderate speed, to keep the suspension homogeneous without shearing crystals. During filtration it is lifted clear. During washing it is lowered to just above the cake to reslurry the solids. During discharge it is lowered fully and reversed to sweep product to the outlet. Programmable speed control and electric lifting make this sequence repeatable batch after batch — critical for GMP reproducibility.
Choose deliberately. Displacement washing pushes fresh solvent through an intact cake and suits well-formed, crack-free cakes; it uses less solvent. Reslurry washing lifts the agitator blade, remixes the cake with solvent, then re-filters; it removes occluded impurities far more effectively when crystals trap mother liquor. The Agitated Glass Nutsche Filter supports both without breaking containment. Operators watching through the glass wall can literally see cracks forming during displacement washing and switch strategy immediately — a diagnostic advantage that shortens purity troubleshooting dramatically.
After washing, lowering the agitator blade to smooth and lightly compress the cake closes channels and improves deliquoring. Vacuum drying then proceeds with jacket heating, typically 40–80°C for heat-sensitive APIs, while the blade turns slowly to break clumps and expose fresh surface. This in-situ drying in the Agitated Glass Nutsche Filter eliminates the wet-cake transfer step to a tray dryer, cutting operator exposure, solvent emissions and product loss. For many pharmaceutical clients, that single elimination is the strongest justification for purchasing the system.
A European biopharmaceutical developer struggled with a chiral API intermediate: incomplete reaction, low crystal purity and yield, corrosive acid-base media attacking metal equipment, and repeated transfers risking cross-contamination. Bioland supplied a customized 100 L glass filter-crystallization reactor executing reaction, crystallization and filtration in one vessel. The catalytic step ran at 0–5°C under nitrogen, with the transparent body confirming reaction completion visually.
Crystallization followed with -20°C jacket coolant and a strictly controlled 1–2°C/hour cooling ramp, producing uniform crystals free of occluded impurities. Filtration then switched to the PTFE plate for direct solid-liquid separation, with mother liquor recycled. Final crystal purity exceeded 99.5% and yield improved by 15%, with zero intermediate transfers.
Borosilicate glass is chemically superb but intolerant of abrupt thermal gradients. Never introduce -20°C coolant into a jacket surrounding an 80°C batch. Bioland advises a maximum ramp of 3–5°C per minute on any Agitated Glass Nutsche Filter, pre-warming or pre-cooling solvents before charging, and never applying positive pressure beyond the rated value. Follow these rules and glass service life easily exceeds a decade. Operators should also check that the support frame is level and that all clamps are evenly torqued before every campaign.
Vacuum performance depends entirely on sealing. Every Agitated Glass Nutsche Filter from Bioland uses PTFE plus mechanical dual sealing on the agitator shaft, with PTFE gaskets at all flange joints. A simple daily practice — pull vacuum with the vessel empty and confirm the gauge holds for ten minutes — catches degrading seals before they cost you a batch. Spare seal kits are stocked, and a changeout takes roughly twenty minutes with basic tools, so downtime remains measured in minutes rather than weeks.
The quick-release filter assembly is a maintenance feature, not just a convenience. Between products, remove the PTFE plate, backflush with compatible solvent, and inspect for embedded fines. Glass walls need no passivation and hold no crevices, so CIP with alkaline then acid cycles restores a validated clean state. This is why the Agitated Glass Nutsche Filter is favoured for multi-product pilot plants where changeover validation would otherwise consume days.
A Polish fine-chemicals producer developing palladium and platinum catalysts faced poor metal recovery, corrosive attack on equipment, catalyst deactivation during high-temperature solid-phase reaction, slow separation and costly cleaning.
Bioland delivered a customized 50 L glass filter-crystallization reactor creating a closed solid-phase reaction and recovery loop. Precursors reacted with organic ligands at 150°C, the borosilicate body tolerating short high-temperature exposure without deactivating catalyst.
The PTFE filter assembly then separated solid catalyst directly, recovering over 90% of residual precious metal from the mother liquor. Double-jacket control covered -80°C to 200°C, and the quick-release filter eliminated residue carryover between batches.
The efficiency case for an Agitated Glass Nutsche Filter rests on eliminated steps. A conventional route — reactor, transfer, crystallizer, transfer, Buchner filtration, transfer, tray dryer — involves four handling operations, each costing product and time. Consolidating those into one Agitated Glass Nutsche Filter typically removes 20–40% of total batch cycle time and materially improves mass balance. Xi'an Bioland Instrument Co., Ltd. has spent more than 15 years engineering distillation, concentration, reaction, extraction, separation, filtration, purification, crystallization, emulsification, mixing and drying equipment, plus supporting heating, cooling and vacuum devices, precisely to build these integrated trains.
For pilot validation, manual operation is a liability. Bioland can equip an Agitated Glass Nutsche Filter with PLC and touchscreen control managing jacket temperature, agitator speed and height, vacuum level, sequential washing and drying steps, with recipe storage and exportable batch records. Fully explosion-proof configurations, electric lifting, ultrasonic crystallization assistance, integrated rectification columns and tail-gas absorption are all available. Documentation packages including material certificates and test reports accompany delivery, shortening IQ/OQ effort for regulated clients.
Solid-phase peptide synthesis is a natural fit. High chemical stability, high mechanical strength and fast reaction kinetics make the Agitated Glass Nutsche Filter widely used for large-scale SPPS, thymopeptide preparation, antimicrobial peptide screening and peptide carrier material synthesis. Repeated coupling, washing and deprotection cycles all occur in one vessel, with resin retained on the PTFE plate and reagents drained between steps. Customers report far lower resin loss than with external filtration setups, plus complete visual confirmation of resin bed condition.
Non-standard is routine. Volume, port layout, filter material, jacket configuration, lifting mechanism and downstream modules on an Agitated Glass Nutsche Filter are all built to specification under OEM and ODM terms. Customized units ship in about 30 business days; standard units in 5–7 days. Sea, rail and air freight are supported, with a one-year warranty and lifetime maintenance. During manufacture, a dedicated specialist sends weekly photo or video updates; final inspection footage is provided before shipment, or clients may attend a Factory Acceptance Test in Xi'an.
Operating an Agitated Glass Nutsche Filter well comes down to disciplined fundamentals: staged vacuum rather than instant maximum pull, filter media matched to actual particle size, controlled 1–2°C/hour crystallization cooling, correct agitator positioning for each phase, deliberate choice between displacement and reslurry washing, and gentle thermal ramping to protect the glass. Get those right and the integrated reaction-crystallization-filtration-drying cycle delivers the results Bioland customers have already achieved — 99.5% purity, 15% higher yield, 90% precious-metal recovery. Backed by CE/ISO certification, GMP-compliant construction and 15+ years of engineering experience, Bioland Instrument delivers process solutions, not just glassware.
Start around -0.02 MPa to build cake, then step up toward -0.09 MPa for final deliquoring.
PTFE sintered plate as standard; stainless steel, titanium, filter cloth and membranes in various pore ratings on request.
-80°C to 200°C with a suitable high-low temperature circulator; short-term 150°C solid-phase reactions are supported.
Standard 20 L, 30 L, 50 L and 100 L, with custom sizes and explosion-proof PLC systems available.
Yes — vacuum drying with jacket heating and slow agitation eliminates wet-cake transfer entirely.
If your cake blinds, your washing leaves impurities, or your product disappears during transfers, Bioland Instrument can engineer the fix. Xi'an Bioland Instrument Co., Ltd. designs each Agitated Glass Nutsche Filter around your slurry, solvent system, temperature profile and throughput — including explosion-proof builds, PLC automation, electric lifting, ultrasonic crystallization and integrated distillation modules. You get CE and ISO certified quality, GMP/FDA-compliant materials, factory-direct pricing, weekly photo and video production updates, optional Factory Acceptance Testing, a one-year warranty and lifetime maintenance. Whether you need a catalogue unit in 5–7 days or a fully customized system in 30 business days, our engineers are ready. Send your process details to info@biolandequip.com and receive a tailored proposal.
1. Wakeman, R. J., Tarleton, E. S. Solid/Liquid Separation: Principles of Industrial Filtration. Elsevier.
2. Tarleton, E. S., Wakeman, R. J. Solid/Liquid Separation: Equipment Selection and Process Design. Butterworth-Heinemann.
3. Mullin, J. W. Crystallization, 4th Edition. Butterworth-Heinemann.
4. Perry, R. H., Green, D. W. Perry's Chemical Engineers' Handbook, Section 18: Liquid-Solid Operations and Equipment. McGraw-Hill.
5. am Ende, D. J. Chemical Engineering in the Pharmaceutical Industry: R&D to Manufacturing. Wiley.
6. ISPE Baseline Guide Volume 2: Oral Solid Dosage Forms. International Society for Pharmaceutical Engineering.
2024-05-16
Pharmaceutical Company
The reactor is beautifully mirror-polished and fully complies with GMP requirements for the pharmaceutical industry. The performance is excellent! Overall, we are very satisfied! We also provided with some feedback on our process improvements, which we hope will be helpful.
2024-04-09
Laboratory
Excellent and professional service. Always reply our questions very fast. All reactors and chiller we received are good too.
2024-02-15
Research Institute
Quality is beyond our expectation actually. After we got the extraction equipment and started using it, the performance was beyond our expectation. Very easy to use and very efficient to run. Service always respond us very quickly. Was also very helpful to help us. Thanks Bioland team. Very happy to work with you.
2023-11-20
Biotech Company
We are happy about the new purchase as always. Equipment and services are both good.
2023-08-05
Instrument Lab
This is the second order with Bioland instrument and everything is good as the first dateText.
2023-05-12
Global Trading Partner
Bioland instrument team is very helpful and professional. The sales helped us select the right equipment for our application, and their logistics people handled the transportation and customs declaration for our shipment. All that saved us a lot of work.
