engleski

EFFECTS OF IMPELLER TYPE AND PRESENCE OF BAFFLES ON ION EXCHANGE IN A BATCH REACTOR

The aim of this work was to define the influence of hydrodynamic conditions on ion exchange of copper on zeolite NaX in baffled and unbaffled agitated reactor. All experiments were carried out in a batch reactor in which mixing were performed by radial straight blade turbine (SBT) and axial pitched blade turbine (PBT). In baffled reactor four standard baffles were used. For both impellers used the impeller speed which ensured complete suspension of zeolite (N=NJS), at standard impeller off-bottom clearance (C/H=0.33), were determined and applied in the investigations. Also, during the all experiments power consumption (PJS) was measured as well. The initial copper concentration (7.04 mmol/L), was the same in all experiments as well as temperature (300K). Change of copper concentration over process time was measured by UV/Vis spectrophotometer and used for calculation of amount of copper exchanged. Various kinetic models were used to test experimental kinetic data. From the results gained it was found that the difference in maximum amount of copper exchanged is insignificant and that the reaction is, in generally, slightly faster in the baffled reactor. But, at the same time baffled reactor is characterized by significantly higher power consumption. On the basis of these findings the optimal reactor hydrodynamics conditions for copper ion exchange onto NAX zeolite has been suggested.

zeolite, impeller type, baffles, ion exchange kinetics

nije evidentirano