2,4-Xylidine Degradation with Ozonation: Mass Transfer and Reaction Kinetics

ABSTRACT

The kinetics of the degradation of 2,4-xylidine by ozonation as well as the ozone mass transfer in a wetted-wall column were investigated. A laboratory-scale ozone contactor was designed, and a steady-state wetted wall reactor model was developed. The model was based on countercurrent-connected and perfectly mixed mass transfer stages. It was possible to describe the evolution of the pollutant and ozone concentrations along the reactor length coordinate in various conditions. The model was used for the evaluation of the ozone mass transfer coefficient, reaction rate kinetics, and stoichiometric coefficient from experimental data. The ozone mass transfer coefficient for the wetted-wall column was estimated from the experiments in the absence of chemical reactions. When the estimated parameters were applied, the ozonation model of the wetted-wall column showed good agreement between the fitted and experimental data.

Keywords:

• Ozone
• Aromatic Amines
• 2,4-Xylidine
• Wetted-Wall Column
• Groundwater Treatment
• Reaction Kinetics

ACKNOWLEDGMENTS

The authors thank the Nordic Energy Research Programme and the Centre of International Mobility for their financial support. The financial support provided by the PROTEK program of the Academy of Finland is also gratefully acknowledged. The authors thank Sven Kamenev from Tallinn Technical University for his assistance throughout the experimental part of the work.