双氧水超临界氧化对氨基苯酚模拟废水

Supercritical Water Oxidation of Para-aminophenol with H2O2

在连续流管式反应器中,以H_2O_2为氧化剂,在温度480～550℃、压力32～38MPa及H_2O_2过量100％～270％的条件下,用超临界水氧化(Supercritical water oxidation,简称SCWO)对含对氨基苯酚的模拟废水进行了实验研究。结果表明,采用SCWO法能有效去除废水中的含氮有机物对氨基苯酚。升高温度、升高压力和延长停留时间使COD去除率显著提高。在550℃,38MPa,H_2O_2过量190％和停留时间229s时,COD去除率高达98.5％。在此条件下,SCWO总动力学对COD是2.13级,反应的活化能为29.3kJ/mol。

Oxidation of para-aminophenol in supercritical water was investigated at 480-550℃, 32-38 MPa with 100%-270% H2O2 in excess. Experiments were performed in a tubular continuous flow reactor with effective volume of 13 ml. Results indicate that para-aminophenol is easily oxidized in supercritical water. The COD elimination efficiency is significantly improved as reaction temperature, pressure or residence time is increased. 98.5% COD removal was obtained in 229 s at 550℃, 38 MPa with 190% H2O2 in excess. In this case, the global kinetics for COD was 2.13 order. The activation energy was 29.3 kJ/mol.