Hybrid & Combination Drying

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Introduction

Kerone’s Freeze & Vacuum Combination Dryer integrates freeze drying (lyophilization) with controlled vacuum drying in a single engineered process. The product is first frozen, then placed under deep vacuum where ice sublimates directly into vapour without passing through the liquid phase, which preserves cellular structure, biological activity and original appearance. After primary drying, the same system moves into a vacuum-assisted secondary stage with warmer shelf temperatures to desorb the remaining bound moisture and reach the target residual moisture level. By combining both stages with precise shelf heating, chamber pressure control and a low-temperature condenser, the equipment gives the stability and shelf life that vaccines, biologics, probiotics, premium foods and delicate natural extracts require. Kerone designs these systems for laboratories, pilot plants and full-scale production, with sanitary construction, reliable refrigeration and process control suited to quality-driven industries.

Why Choose Kerone Freeze & Vacuum Combination Dryer

Lyophilization is one of the most demanding drying processes, so equipment reliability and process understanding matter as much as specification sheets. Kerone designs the shelf system for uniform temperature distribution, which directly influences cake appearance and batch-to-batch consistency. The condenser is sized for the maximum ice load and runs at a temperature low enough to capture vapour efficiently, protecting the vacuum pump and keeping chamber pressure steady. Our control systems allow stepwise recipes with defined freezing rates, annealing, primary-drying shelf temperatures and secondary-drying holds, together with data logging that supports quality records. Product-temperature probes and pressure-comparison methods help operators detect the end of primary drying rather than relying on fixed timers, saving energy and avoiding product collapse. Stainless-steel construction, clean internal geometry and cleaning provisions can be supplied to support hygiene and pharmaceutical expectations. With Kerone you receive a system matched to your product’s critical temperature, batch size and validation requirements.

Types and Features of Freeze & Vacuum Combination Dryer

Kerone offers laboratory benchtop units, pilot freeze dryers for development work and large production systems with multiple heated shelves. Chamber styles include shelf-type systems for vials, trays and bulk products, manifold-type systems for flasks and ampoules, and top-press or stoppering versions for sterile pharmaceutical vials. Shelf temperature typically ranges from about minus 50 degrees Celsius to plus 60 or 70 degrees Celsius, while condenser temperatures commonly fall between minus 50 and minus 80 degrees Celsius, and chamber pressure is controlled at the low levels required for sublimation. Refrigeration can be single-stage or cascade, and heat transfer fluid circulation is regulated for tight shelf uniformity. Features include automatic recipe control, vacuum leak-rate testing, clean-in-place or wash-in-place options, in-situ sterilisation provisions, pirani and capacitance pressure gauges, and optional vacuum-assisted secondary drying profiles for ultra-low moisture targets.

Key Features

  • Two-stage drying in one system: Sublimation of ice is followed by vacuum desorption of bound moisture for very low final moisture content.
  • Uniform shelf temperature control: Circulating heat-transfer fluid maintains even heating and cooling across all shelves.
  • Deep-cold condenser: Efficiently captures sublimed vapour, protects the vacuum pump and supports stable chamber pressure.
  • Programmable lyophilization recipes: Freezing, annealing, primary and secondary drying steps can be stored, edited and repeated.
  • Accurate pressure management: Vacuum control with calibrated sensors helps keep product below its critical collapse temperature.
  • Product-temperature monitoring: Probes and endpoint detection reduce guesswork about when primary drying is complete.
  • Sanitary construction options: Polished stainless steel, smooth welds and cleaning provisions support hygienic operation.
  • Data logging and alarms: Cycle records, trend charts and alarm notifications help with traceability and quality documentation.

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Applications of Freeze & Vacuum Combination Dryer

Kerone’s Freeze & Vacuum Combination Dryers are extensively used in industries where preserving structure, potency and shelf stability is essential. Typical applications include:
    • Lyophilizing vaccines, biologics, antibiotics, peptides and other injectable pharmaceutical products.
    • Preserving probiotic cultures, enzymes, starter cultures and other live or active ingredients.
    • Producing freeze-dried fruits, vegetables, instant coffee and ready-to-eat meal components.
    • Drying herbal extracts, marine ingredients, collagen and other high-value nutraceutical materials.
    • Preparing diagnostic reagents, calibrators and laboratory reference materials for long-term storage.
    • Conserving biological samples, tissues and research materials in laboratories.
Kerone’s Freeze & Vacuum Combination Dryer provides the controlled, low-temperature environment needed to preserve valuable products in their most stable form. By linking freeze drying with vacuum-assisted secondary drying, it delivers excellent structure retention, high activity recovery and long shelf life while giving operators detailed control over every stage of the cycle. Whether you are developing a new formulation in the lab or scaling to full production, Kerone can help you choose the right shelf area, condenser capacity and automation level. Contact our team with your product characteristics and batch targets to receive a recommended configuration and guidance on cycle development.

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Frequently Asked Questions (FAQ)

  • Primary drying removes frozen water by sublimation, but some water stays bound to the solid matrix. The vacuum-assisted secondary stage at higher shelf temperature removes that residual water, achieving the low moisture needed for long-term stability.

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