ABSORPTION KINETICS OF OZONE IN AQUEOUS O-CRESOL SOLUTIONS

The kinetics of ortho-cresol ozonation in water has been studied using the film theory. At most experimental conditions investigated, the kinetic regime of the absorption has been fast pseudo first order with respect to ozone. At 30-degrees-C mass transfer plays an important role in controlling the absorption rate of ozone. The self-decomposition reaction of ozone does not take place because of the great reactivity of o-cresol with ozone. Reaction rate constants have been determined at pH 7 for different temperatures below 30-degrees-C. The following Arrhenius equation was obtained: k(T) = 2.2 x 10(23) exp(- 11784/T), L/mol . s At temperatures below 30-degrees-C there exists an ozone partial pressure value above which the ozone absorption kinetic regime changes to fast second order regardless of experimental conditions.