-
E-mail
848186302@qq.com
-
Phone
15639761399
-
Address
No. 182 Industrial Road, Shangjie District, Zhengzhou City
Zhengzhou Huachen Instrument Co., Ltd
Process flow of vacuum freeze dryer
Date: 2024-12-11Read: 7
Vacuum freeze dryer is a common freeze-drying equipment widely used in fields such as food, pharmaceuticals, biotechnology, and chemical engineering. The basic principle is to utilize the characteristic that the sublimation point of a substance under vacuum conditions is lower than its melting point. After freezing the substance, it is heated in a vacuum drying chamber to directly sublime the frozen water from the solid state into water vapor, thereby achieving the purpose of drying.
The drying process of a vacuum freeze dryer can generally be divided into the following steps:
1. Freezing
Place the water sample in the freezer to quickly freeze it into uniform ice crystals and ensure that the sample remains frozen throughout the entire drying process. The length of freezing time varies depending on the nature, shape, and size of the sample.
2. Heating up
After freezing, place the sample in a vacuum drying chamber and heat it at room temperature. The heating process needs to consider the influence of drying speed and temperature on sample quality, and should not exceed the thermal stability temperature of the sample.
3. Dry
When the heated sample gradually enters the sublimation state, the moisture vapor in the drying chamber is removed by a vacuum system to ensure that the moisture in the material evaporates and sublimates from the ice crystal state to water vapor under low pressure, achieving the drying purpose of the sample. The length of drying time depends on the properties and moisture content of the sample itself.
4. End of drying
After the sample is dried, take out the sample and, if necessary, add protective gas in a closed environment to reduce the sample's re absorption of moisture. The dry sample obtained at this time is usually a high-purity and easily storable powder like substance.
