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Principle and characteristics of nanometer spray dryer
Date: 2025-03-13Read: 4
The principle of nano spray dryer is to transform the suspension containing nano scale crystals into tiny droplets through a specific spray device, and use hot air or other drying media to quickly remove the solvent in these droplets, so as to obtain dry and well dispersed nano crystal powder. The specific process is as follows:
1. Atomization stage: the suspension containing nanocrystals is sent to the nozzle of the spray by high-pressure pump, and is subjected to strong shear force and impact force, and is dispersed into extremely small droplets. The surface area of these droplets greatly increases, thereby accelerating the evaporation rate of the solvent.
2. Drying stage: These small droplets enter the drying tower and come into full contact with hot air or other drying media. Hot air not only provides the heat required to evaporate the solvent, but also accelerates the diffusion of the solvent from the droplet surface to the surrounding medium through strong convection. As the solvent continues to evaporate, the droplets gradually contract and solidify, ultimately forming nanocrystalline powder.
3. Collection stage: The dried nanocrystalline powder can be separated and collected through an electrostatic dry powder collector.
Features of nano spray dryer include:
1. Efficient: Fast drying speed, able to evaporate most of the moisture in a short period of time.
2. Wide applicability: Suitable for various thermosensitive materials, such as pharmaceutical products, ensuring product quality is not affected by high temperatures.
3. Strong controllability: the particle size distribution, morphology and bulk density of the obtained nanocrystalline powder can be controlled by adjusting the nozzle size of the spray, the concentration of the suspension, the temperature and flow rate of the drying medium and other parameters.
Application field: Nano spray drying technology has been widely used in medicine, chemical industry, material science and other fields, providing an efficient and reliable method for the preparation and processing of nanocrystals.
