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Shanghai Yacheng Instrument Equipment Co., Ltd
Technological principle of laboratory spray freeze dryer
Date: 2025-05-21Read: 8
The process principle of the laboratory spray freeze dryer combines the rapid dispersion advantage of spray drying with the low-temperature protection characteristics of freeze drying, and realizes the low-temperature and efficient drying of materials through three stages:
1、 Atomization dispersion
The liquid material is first atomized into small droplets of 10-200 μ m through a high-pressure nozzle or centrifugal device. This instantaneous dispersion greatly increases the surface area of the material, allowing it to quickly come into contact with the environmental medium, laying the foundation for subsequent freezing and drying.
2、 Low temperature freeze curing
The atomized droplets enter a low-temperature environment (usually below 0 ℃) and quickly freeze into solid particles by coming into contact with a cooling medium (such as liquid nitrogen or cold air flow). Some equipment adopts 35 ℃ low-temperature spray for direct curing, and uses the principle of rapid evaporation and heat absorption of liquid to achieve phase change and reduce cooling energy consumption. The ice crystal structure formed during the freezing process creates porous channels for subsequent sublimation.
3、 Vacuum sublimation drying
Particles undergo ice crystal sublimation under vacuum conditions (pressure below the triple point of water), and solid water is directly converted into gas and released. The entire process is controlled precisely (≤ 40 ℃) to avoid denaturation of thermosensitive components, resulting in the formation of a loose and porous network structure of residual solids, while retaining their original form and activity. The thermal energy required for sublimation is supplied by conduction or radiation, and the cold trap (-40 ℃ to -80 ℃) captures the escaping water vapor to maintain a vacuum environment.
4、 Key process advantages
1. Low temperature protection
The temperature control throughout the process is below 40 ℃, which is particularly suitable for the activity retention of thermosensitive substances such as proteins and enzyme preparations.
2. Efficient integration
Atomization shortens the liquid processing time, and sublimation drying only requires minutes of operation, reducing the total time compared to traditional freeze-drying.
3. Structural controllability
By adjusting the atomization parameters and freezing rate, the particle size distribution and porosity of the product can be customized to achieve ideal solubility and rehydration performance.
4. Energy consumption optimization
Compared to traditional vacuum freeze-drying, atomization dispersion reduces the time and energy required for material freezing, resulting in a decrease in overall energy consumption.
