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[Chemical Knowledge]：Freeze drying and spray drying: Two different drying techniques

Read： 665 Time：17months ago Source：Transform the World with Simplicity

Drying is a common processing process and is widely used in many industries. Freeze drying and spray drying are two commonly used drying technologies, and there are some differences between them in principle, application and effect.

freeze drying, also known as lyophilization, is a drying method in which a substance is frozen at a low temperature and then heated in a vacuum environment to evaporate water. Its main principle is to convert the water in the material directly into ice crystals at low temperature, and then use the low temperature and low pressure in the vacuum environment to make the ice crystals directly change from solid to water vapor by heating up. The main advantages of freeze-drying include the retention of the original properties of the material, especially the heat-sensitive material, which is excellent in the activity, color, taste and shape of the retained material. However, the process of freeze-drying is complicated, takes a long time, and the equipment cost is high. Therefore, it is usually applied to high value-added products, such as biological products, pharmaceuticals, etc.

spray drying is a process in which a liquid substance is converted into small particles through an atomizer and dried rapidly in a hot air stream. The principle of spray drying is to use a high-speed rotating atomizer to atomize a liquid substance into small particles. Under the action of a hot air flow, the water quickly evaporates to obtain dry particles. Spray drying has the advantages of fast drying speed and low energy consumption, and is also suitable for mass production. However, spray drying may cause problems such as decomposition and oxidation of heat-sensitive substances during the atomization of liquid substances, and also cause agglomeration and fragmentation of particles, which affects the quality of products. Therefore, spray drying is mainly used in food industry, chemical industry and other fields.

freeze drying and spray drying have obvious differences in drying principle, application and effect. Freeze drying has the advantage of retaining the original characteristics of the substance and is suitable for high value-added, heat-sensitive products. Spray drying has the advantages of fast drying speed and suitable for large-scale production, and is suitable for drying liquid substances. From an economic point of view, freeze-drying equipment costs are high, but because it can retain the activity and quality of the material, it is suitable for the production of high value-added products. The cost of spray drying equipment is relatively low, suitable for large-scale production, but in the retention of material activity and quality is slightly inferior.

In short, freeze drying and spray drying are two different drying technologies, each with its own advantages and scope of application. When choosing a drying technology, it is necessary to consider the characteristics of the product, economic benefits and other factors. Through the reasonable selection of drying technology, the quality requirements of the product can be met to the greatest extent and the production efficiency can be improved.

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