Tianfeng SFD-3 Pilot-Scale Freeze Dryer

Overview

The Tianfeng SFD-3 is a pilot-scale, shelf-type freeze dryer engineered for process development, scale-up validation, and small-batch manufacturing in regulated and research environments. It operates on the fundamental principle of lyophilization—sublimation of ice under deep vacuum while maintaining product temperature below its eutectic or collapse temperature. This unit integrates silicone oil as a thermal transfer medium across all shelves, enabling precise, uniform conductive heating and cooling critical for reproducible drying kinetics and structural integrity of thermolabile materials. Designed for seamless transition from lab-scale feasibility studies to GMP-aligned production workflows, the SFD-3 supports full-cycle control—from primary drying (ice sublimation) through secondary drying (bound water desorption)—with real-time monitoring of shelf temperature, chamber pressure, and condenser performance. Its −70 °C condenser and ≤5 Pa ultimate vacuum capability ensure efficient vapor removal even for high-moisture formulations such as pet food matrices, biological suspensions, and herbal extracts.

Key Features

• Silicone oil-heated shelves with ≤±1 °C temperature uniformity across all positions—critical for batch consistency and regulatory compliance.
• PLC-based control system with 7-inch touchscreen HMI, supporting up to five user-defined freeze-drying protocols, each containing up to 24 individually adjustable time/temperature/vacuum segments.
• In-process parameter modification: operators may adjust setpoints during active cycles without interrupting operation.
• Comprehensive data logging—including shelf temperature profiles, chamber pressure curves, condenser temperature, and operational event timestamps—with automatic export to USB storage.
• Optional in-situ eutectic point detection module for empirical determination of critical formulation temperatures, enhancing cycle design accuracy.
• High-transparency, non-reflective acrylic door enabling unobstructed visual monitoring of sample morphology throughout freezing, primary, and secondary drying phases.
• Stainless steel drying chamber and condenser housing with electropolished interior surfaces meeting ASME BPE surface finish standards for cleanability.
• Integrated inert gas backfill valve (N₂ or argon compatible) for oxygen-sensitive products, supporting ISO 11133 and USP requirements for sterile processing environments.
• Robust mechanical architecture: reinforced shelf support structure, leak-tight chamber sealing, and low-vibration scroll vacuum pump configuration.

Sample Compatibility & Compliance

The SFD-3 accommodates diverse sample formats including bulk liquids (up to 4 L), standard pharmaceutical vials (Φ16 mm and Φ20 mm), and custom trays. It is routinely deployed for freeze-drying of biologics (monoclonal antibodies, vaccines, enzymes), botanical extracts (ginseng, cordyceps, deer antler), functional pet nutrition matrices, and diagnostic reagents. The system meets foundational engineering requirements aligned with ISO 22000 (food safety), ISO 13485 (medical devices), and ICH Q5C stability guidelines. While not certified as Class A equipment per EU Annex 1, its data integrity features—including user access control, electronic signatures, and tamper-evident audit trails—support compliance with FDA 21 CFR Part 11 and EU GMP Annex 11 when validated in-house per client SOPs.

Software & Data Management

The embedded control software provides real-time graphical display of all critical process variables, with configurable alarm thresholds and automatic fault logging. All operational data—including parameter changes, manual interventions, and system status transitions—are timestamped and stored locally with SHA-256 hash verification. Export formats include CSV and PDF reports compatible with LIMS integration. Optional software modules enable remote monitoring via Ethernet (Modbus TCP), historical trend analysis, and deviation investigation workflows compliant with ALCOA+ principles (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available).

Applications

• Pharmaceutical R&D: Cycle development for parenteral formulations, lyophilized diagnostics, and biosimilar comparability studies.
• Food & Pet Nutrition: Preservation of enzymatic activity in functional pet treats, retention of volatile aromatics in freeze-dried meats, and shelf-life extension of probiotic-enriched snacks.
• Traditional Medicine: Stabilization of heat-labile glycosides and polysaccharides in Chinese herbal preparations without solvent residues.
• Academic Research: Cryopreservation of microbial cultures, tissue engineering scaffolds, and nanomaterial dispersions requiring morphological fidelity post-drying.
• Contract Development & Manufacturing Organizations (CDMOs): Bridging analytical method transfer and commercial process validation for clients targeting FDA, EMA, or NMPA submissions.

FAQ

What is the maximum batch size supported by the SFD-3?
The unit accommodates up to 4 liters of aqueous solution or approximately 1200 standard 16-mm vials per cycle, depending on fill volume and formulation viscosity.
Does the system comply with 21 CFR Part 11 requirements?
Yes—the PLC controller supports role-based user authentication, electronic signatures, and immutable audit trails; full compliance requires site-specific validation per internal SOPs.
Can the SFD-3 be integrated into an existing SCADA or MES platform?
Yes—Modbus TCP and optional OPC UA gateways enable bidirectional communication with industrial automation systems.
Is validation documentation available?
Factory acceptance test (FAT) reports and IQ/OQ templates are provided; PQ must be executed on-site by qualified personnel per client’s protocol.
What maintenance intervals are recommended for the vacuum system?
Oil-sealed rotary vane pumps require oil replacement every 500 operating hours; scroll pumps (optional) are maintenance-free for 10,000 hours under typical load conditions.