NUTRIENT RELEASE CHARACTERISTICS AND COATING HOMOGENEITY OF BIOPOLYMER COATED UREA AS A FUNCTION OF FLUIDIZED BED PROCESS VARIABLES

作者：Azeem Babar; KuShaari KuZilati; Man Zakaria; Trinh Thanh H

来源：Canadian Journal of Chemical Engineering, 2017, 95(5): 849-862.

DOI：10.1002/cjce.22741

<jats:title>Abstract</jats:title><jats:sec><jats:label /><jats:p>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.</jats:p><jats:p>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.</jats:p></jats:sec>

• 出版日期2017-5