Effects of reaction parameter on yield of benzaldehyde produced from toluene oxidization using hydrogen peroxide in subcritical water are investigated. The experimental results show that if the molar ratio of hydrogen peroxide to toluene is controlled within a reasonable range, the by-products may be neglected. The optimum technology of toluene oxidization to benzaldehyde is reaction time 60 min,reaction temperature 350 °C, molar ratio of hydrogen peroxide to toluene 3.5. The yield of benzaldehyde can reach 17.2% under the optimum condition. Research results of chemical reaction kinetics show that the consecutive reaction consists of two first-order reaction,and activation energy of these two reactions are 89 kJ·mol -1 and 76 kJ·mol -1 respectively.
