engleski

Investigation on the effects of process variables on copper exchange on NaX in a batch stirred reactor

The aim of this work was to determine the effects of anion type (A), time (t), impeller off-bottom clearance (C/H) and solute concentration (c) on copper exchange on zeolite NaX in a batch stirred reactor. The experiments were carried out at constant temperature (300 K) and at the same impeller speed (250 rpm). The amount of exchanged copper at examined conditions was measured by UV/Vis spectrophotometer. In order to find the optimal process conditions for copper exchange on the basis of experimental data, Taguchi’s method for experimental design were used, applying larger-the-better approach. Beside the optimum experimental conditions this method allowed to define the influence of each process variable on the process conducted. Applied method has shown that the highest copper exchange is achieved at increased solute concentration, when sulphate anion was used, and impeller is positioned at standard position (C/H =0.33). It was also found that solute concentration and anion type have more pronounced impact on process investigated than impeller position and process duration (c > A > c/H > t). For the optimum experimental condition, kinetic data for copper exchange were obtained and tested using the Elovich and the Ritchie kinetic models.

batch reactor ; ion exchange kinetics ; optimisation ; zeolite

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