Spray Drying
The final powdered product is most often collected in a cyclone where the flow of air separates the unwanted particles from the desired particle size. Particles that are too small adhere to the wall of the cyclone, particles that are too large are filtered into a waste container, and the desired particles are deposited into the collection container at the end of the system. An advantage to spray drying over other techniques (such as oven drying or freeze drying) is the relative uniformity and sphericity of particles produced. Adjusting the settings on the spray dryer allows for control of particle properties such as density, size (in micrometers or nanometers), and moisture content. Settings that can be altered depend on the specific spray dryer but may include the concentration of the liquid, feed rate of the liquid, aspirator flow rate or air flow rate, and inlet temperature or temperature of the air running through the drying chamber. The temperature of the air at the point in which the particles pass into the collection cyclone is known as the outlet temperature, which cannot be controlled directly but is a dependent variable of the other previously mentioned settings. The video below gives a brief demonstration of one type of spray dryer, which is similar to the one I used, so you can see the concepts I have described.
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August 2015
Categories"Travel makes one modest. You see what a tiny place you occupy in the world."
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