Drying kinetics of coated Sodium percarbonate (cas 15630-89-4) particles in a conical fluidized bed dryer

Add time:09/09/2019    Source:sciencedirect.com

Sodium percarbonate (cas 15630-89-4) is a white powder that is used as bleach in detergent industries. Because of its sensitivity to environment and tendency to maintain the strength of bleaching action, it needs to be coated. Therefore, the drying of the coated sodium percarbonate particles is the main stage of their production process. In this study, the kinetics of the drying process of coated sodium percarboanate particles is investigated using a particle fluidization method and a conical fluidized bed dryer on a laboratory scale. The experiments are conducted at the inlet air temperature of 60, 70, and 80 °C and the air flow rate of 90, 100, and 120 m3/h. Then, some of the widely used drying models are fitted to the experimental data of the moisture ratio. The fit quality of the models is determined using the coefficient of determination (R2), root mean square error (RMSE), and reduced chi – square (χ2). Among the considered models, the ʻModified Henderson & Pabisʼ model with average R2 = 0.988204 and the ʻtwo termʼ model with average R2 = 0.985082, under almost all operating conditions, and the model developed by Verma et al. with average R2 = 0.971698 at high flow rate and high temperature are selected as the best models. In the drying process of coated sodium percarbonate particles, the effective diffusivity varies from 2.2337 × 10− 10 to 22.0648 × 10− 10 m2/s.

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