Influence of Impeller Diameter on Crystal Growth Kinetics of Borax in a Mixed Dual-Impeller Batch-Cooling Crystallizer
Corresponding Author
Antonija Čelan
University of Split, Faculty of Chemistry and Technology, Department of Chemical Engineering, R. Boškovića 35, 21000 Split, Croatia
Correspondence: Antonija Čelan ([email protected]), University of Split, Faculty of Chemistry and Technology, Department of Chemical Engineering, R. Boškovića 35, 21000 Split, Croatia.Search for more papers by this authorMarija Ćosić
University of Split, Faculty of Chemistry and Technology, Department of Chemical Engineering, R. Boškovića 35, 21000 Split, Croatia
Search for more papers by this authorIgor Pehnec
University of Split, Faculty of Electrical Engineering, Department of Mechanical Engineering and Naval Architecture, R. Boškovića 32, 21000 Split, Croatia
Search for more papers by this authorNenad Kuzmanić
University of Split, Faculty of Chemistry and Technology, Department of Chemical Engineering, R. Boškovića 35, 21000 Split, Croatia
Search for more papers by this authorCorresponding Author
Antonija Čelan
University of Split, Faculty of Chemistry and Technology, Department of Chemical Engineering, R. Boškovića 35, 21000 Split, Croatia
Correspondence: Antonija Čelan ([email protected]), University of Split, Faculty of Chemistry and Technology, Department of Chemical Engineering, R. Boškovića 35, 21000 Split, Croatia.Search for more papers by this authorMarija Ćosić
University of Split, Faculty of Chemistry and Technology, Department of Chemical Engineering, R. Boškovića 35, 21000 Split, Croatia
Search for more papers by this authorIgor Pehnec
University of Split, Faculty of Electrical Engineering, Department of Mechanical Engineering and Naval Architecture, R. Boškovića 32, 21000 Split, Croatia
Search for more papers by this authorNenad Kuzmanić
University of Split, Faculty of Chemistry and Technology, Department of Chemical Engineering, R. Boškovića 35, 21000 Split, Croatia
Search for more papers by this authorAbstract
The influence of impeller diameter on crystal growth kinetics of borax decahydrate in a batch-cooling crystallizer of non-standard aspect ratio was evaluated. The dual-impeller configuration consisted of a pitched-blade turbine which was mounted below a straight-blade turbine on a single shaft. Three different impeller-to-tank diameter ratios were investigated. In all experiments, mixing was conducted at just-suspended impeller speed. To examine hydrodynamic conditions, mixing times were measured. The fluid flow pattern and velocity distribution were determined by computational fluid dynamics. Results showed that the smallest but also more regularly shaped crystals were produced in a system with standard diameter impellers. Product yield and power consumption were highest in this case.
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