Oxidation of phenol into benzoquinone at room temperature reinforced by hydrodynamic cavitation field
The oxidation reaction between phenol and H2O2 at room temperature was strengthened in the field of hydrodynamic cavitation on the basis of a Venturi tube.The products were analyzed by gas chromatography-mass spectrometry.The effect of reaction conditions on the phenol conversion efficiency was investigated,and the reaction process was also deduced and verified according to the products distribution.With the enhancement of hydrodynamic cavitation field,the hydroxide radical dissociated by H2O2 could attack the phenol and thus transferred into hydroquinone.Hemiquinone was formed by the dissociation of hydrogen radicals,and finally bonded to form benzoquinone.The optimum reaction conditions were with 0.4 MPa venturi tube inlet pressure,9％volume fraction of oxidant H2O2,91％volume fraction of solvent water,8 g initial dosage of phenol,at 35.8 ℃ for 10 min,the conversion rate of phenol and the selectivity of benzoquinone are 34.5％and 80.5％.
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