期刊
KONA POWDER AND PARTICLE JOURNAL
卷 -, 期 39, 页码 230-239出版社
HOSOKAWA POWDER TECHNOL FOUNDATION
DOI: 10.14356/kona.2022016
关键词
fluidized bed spray granulation; coating; surface roughness; laser-scanning microscopy; product property correlation
资金
- German Research Foundation within the DFG [GRK 2462, 390794421]
- BASF SE
This study presents a workflow for developing a multidimensional, linear correlation between the process conditions during fluidized bed spray granulation and the surface morphology of the resulting granules. The results show that the spray rate of the coating solution, the fluidization air temperature, and the atomization pressure at the nozzle have a strong influence on the surface roughness.
A workflow for developing a multidimensional, linear correlation between the process conditions during fluidized bed spray granulation and the surface morphology of the resulting granules is presented. Spray coating experiments with Cellets (R) 500 particles and sodium benzoate solution were performed in a lab-scale fluidized bed varying liquid spray rate, fluidization air flow rate, fluidization air temperature, spray air temperature and spray atomization pressure. To characterize the surface structure, the surface roughness of the coated particles was quantified using confocal laser-scanning microscopy. The roughness was correlated to the process conditions, and the resulting correlation was rigorously analyzed for the importance and co-linearities of the individual process parameters using a principal component analysis. The surface roughness is strongly dependent on the spray rate of the coating solution, the fluidization air temperature and the atomization pressure at the nozzle. in general, wet process conditions and large droplets with a low initial velocity favor the formation of particles with a rough surface structure, while dry conditions and fine droplets with a high velocity result in granules with a smooth and compact coating layer.
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