超临界水氧化处理对氨基苯酚废水研究

Catalytic Oxidation Para-aminophenol with Cu^(2+) in Supercritical Water

采用Cu2+为催化剂、H2O2为氧化剂,在一连续流反应器中进行了催化超临界水氧化对氨基苯酚实验。研究了温度、压力、停留时间和Cu2+浓度对对氨基苯酚氧化降解的影响。结果表明,在超临界水中对氨基苯酚能被有效去除。对氨基苯酚的去除率随反应温度和压力的升高、停留时间的延长和Cu2+浓度增大而提高。当Cu2+浓度为30 m g.L-1时,对氨基苯酚的去除率与无催化剂时相比有了较大的提高,当30 M Pa、500℃、2.8 s和Cu2+浓度为30 m g.L-1时,COD去除率高达97.2%。

The catalytic oxidation of para-aminophenol in supercritical water with oxidation catalyst Cu^2＋ and oxidant H2O2 was investigated in a tubular continuous flow reactor at 24-30 MPa, 480-500℃. The effects of temperature, pressure, residence time and concentration of oxidant Cu^2＋ on the destruction of para-aminophenol were also studied. The results showed that para-aminophenol was easily oxidized in supercritical water. The elimination efficiency of para-aminophenol was significantly improved followed the increase of reaction temperature, pressure, residence time and oxidant Cu^2＋ concentration. When Cu^2＋ concentration was 30 mg/L, the destruction of para-aminophenol was much higher than no-catalyst. The COD removal rate was reached 97.2% at 30 MPa,500℃ and 30 mg· L^-1 Cu^2＋ in 2.8s.