Spray dryer technology and microencapsulation: a brief review
DOI:
https://doi.org/10.18554/rbcti.v10i00.6826Keywords:
Glass transition , Carriers, Process parametersAbstract
Microencapsulation consists of coating substances with an encapsulating agent, resulting in small particles, with the spray dryer being one of the technologies employed. The objective of this study was to review the spray dryer atomization drying process, highlighting the main operating parameters and their correlations with product characteristics. The bibliographic survey was conducted on Google Scholar, using keywords such as spray dryer, microencapsulation, encapsulating agents, glass transition, among others. Works that addressed the process parameters and their effects on the product were selected. It was observed that variables such as temperature, pressure, flow rate, and feed fluid characteristics (viscosity, solids content, and glass transition temperature) directly influence the quality and stability of the powder. Problems such as stickiness, which is adhesion in the chamber, and caking, a phenomenon that can occur during storage due to factors such as humidity, temperature, pressure, and electrostatic forces of the particles, can lead to liquefaction of the product. It was concluded that knowledge of the material to be atomized is essential for defining the parameters, aiming at microencapsulation efficiency.
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