Effect of radial impeller size in the presence and absence of baffles on the copper exchange on zeolite NaX

Authors

  • Sandra Svilović Department of Chemical Engineering, Faculty of Chemistry and Technology, University of Split
  • Marija Ćosić Department of Chemical Engineering, Faculty of Chemistry and Technology, University of Split
  • Anita Bašić Department of Chemical Engineering, Faculty of Chemistry and Technology, University of Split

Keywords:

SBT impeller, impeller size, baffles, zeolite mass, kinetics

Abstract

Effect of hydrodynamics on ion exchange in a batch reactor is still not appropriately studied even proper mixing parameters may considerably affect the process of solid suspension and its costs. In this work, hydrodynamic conditions generated by SBT impellers of different diameters for different zeolite mass in the reactor with and without baffles were investigated. The aim was to analyze their influence on just suspended impeller speed, power consumption, maximum amount of copper exchanged onto zeolite NaX and copper exchange kinetics as well. All experiments were conducted at the same temperature, initial concentration of the copper solution and zeolite particle size. The obtained results showed that NJS decreases as impeller diameter increases in the reactor with and without baffles and that the NJS is considerably lower in the reactor without baffles. In the reactor with the baffles the increase in zeolite mass causes a slight increase of NJS which is more pronounced in the systems with a smaller impeller. In the reactor without the baffles the increases in zeolite mass also cause a slight increase of NJS but in this case, the effect is the same for all impeller diameters applied. Power consumption, at the state of complete zeolite suspension, decreases as impeller diameter increases and its values in the reactor without baffles are considerably lower as well. Kinetics results indicated that the amount of copper ion increases significantly in the initial stage and then gradually until the equilibrium is reached for all hydrodynamics conditions and mass of zeolite examined

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Published

2021-11-25

Issue

Engineering Review, Vol. 41, No. 2

Section

Articles

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