The reaction kinetics of phenol chemical oxidation by the O3/H2O2 process

被引：0

作者：

Chen, Y. ^{[1
]}

Zhang, H. ^{[1
]}

Zhong, L. ^{[1
]}

Chen, H. ^{[1
]}

机构：

[1] Department of Chemical Engineering, Guangdong Sr. Coll. Petrochem. Tech., Maoming, Gungdong 52500, China

来源：

Huaxue Fanying Gongcheng Yu Gongyi/Chemical Reaction Engineering and Technology | 2001年 / 17卷 / 01期

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摘要：

The reaction kinetics of phenol chemical oxidation by the O3/H2O2 process was investigated in the pH values ranging from 3.2 [similar to] 9.8 at temperatures varying from 288 to 308 K utilizing the stopped-flow spectrophometer. The conclusion coming from experiments and analyses is that the pathways and the reaction kinetics of phenol peroxone oxidation are different in various acidity. The reaction mechanism is direct oxidation of phenol with ozone molecules in acidic (pH = 3.2) and weak acidic (pH = 6.5) conditions, the overall kinetics of the peroxone ozonation of phenol is 0.35 order with respect to the concentration of phenol and independent of the concentrations of the ozone and H2O2 at pH3.2, and the overall kinetics of the peroxone ozonation of phenol is 1.3 order with 0.3 order in the concentration of phenol and first order in the concentrations of the ozone and independent of the concentrations of H2O2 at pH6.5. The hydroxyl radical mechanism is dominating in alkaline solutions (pH = 9.8), and the overall kinetics of the peroxone ozonation of phenol is 1.35 order with first order in the concentration of in the concentration of ozone and 0.35 order in the concentration of H2O2 and independent of the concentrations of phenol. The rate constant increases with temperature, and the activation energy of 17.2kJ/mol at pH3.2 was obtained.

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页码：55 / 60