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Nutrient release characteristics and coating homogeneity of biopolymer coated urea as a function of fluidized bed process variables

Azeem, B. and KuShaari, K. and Man, Z. and Trinh, T.H. (2017) Nutrient release characteristics and coating homogeneity of biopolymer coated urea as a function of fluidized bed process variables. Canadian Journal of Chemical Engineering, 95 (5). pp. 849-862.

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Abstract

The present study investigates the effect of fluid-bed process parameters on the diffusion coefficient of nitrogen release and coating homogeneity of controlled-release urea (CRU) produced in a rotary fluidized bed using polyvinyl-alcohol-modified starch as a coating material. An existing mathematical model was used to estimate the diffusion coefficient. The coefficient of variance of size distribution and coating mass variation are reported as a measure of coating homogeneity. Statistical analysis suggested that the most influential process variables that govern urea release characteristics and coating homogeneity were (a) fluidizing gas temperature and (b) coating time. A moderate spray rate combined with longer coating time yielded the lowest diffusion coefficient for nutrient release. Elutriation as the result of elevated fluidizing gas temperature allowed a higher diffusion coefficient due to lower coating thickness. Burst release patterns were observed for granules with coating imperfections. The augmented temperature of fluidizing gas had a negative effect on coating mass and size distribution of CRU granules but the influence of longer coating time was positive. © 2016 Canadian Society for Chemical Engineering

Item Type:Article
Impact Factor:cited By 1
Departments / MOR / COE:Division > Academic > Faculty of Engineering > Chemical Engineering
ID Code:19505
Deposited By: Ahmad Suhairi
Deposited On:20 Apr 2018 06:04
Last Modified:20 Apr 2018 06:04

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