Ozone transfer and decomposition of isopropyl alcohol by H2O2/ozone process in a rotating packed contactor

Ozone transfer and decomposition of isopropyl alcohol in aqueous solution by H2O2/O-3 process in a rotating packed contactor was studied under various operational conditions. Decomposition of isopropyl alcohol by H2O2/O-3 process in a rotating packed contactor has been shown to be feasible and can be described with a simplified pseudo-first order kinetic model. Both the overall ozone transfer coefficient and the decomposition rate of isopropyl alcohol by H2O2/O-3 process in the rotating packed contactor were enhanced with the increase of rotor speed. The decomposition rate was greatly affected by the rotor speed for experiments conducted at lower gas/liquid flow rate ratio. The decomposition of isopropyl alcohol was favored to occur in neutral and alkaline solutions; however, the decomposition rate of isopropyl alcohol for experiment conducted at pH 11 was found to be hindered. The decomposition of isopropyl alcohol was accelerated with increasing H2O2/O-3 molar ratio. However, for experiments conducted in neutral and alkaline solutions, excessive additions of H2O2 might serve as scavenger for OH center dot free radicals to inhibit the decomposition of isopropyl alcohol.