【摘要】 采用Mn2+为催化剂、H2O2为氧化剂,在24~30 MPa和400~500℃的条件下,在一连续流反应器中进行了催化超临界水氧化偏二甲肼实验。研究了温度、压力、停留时间和Mn2+浓度对偏二甲肼氧化降解的影响。结果表明,在超临界水中偏二甲肼能被有效去除。偏二甲肼的去除率随反应温度和压力的升高、停留时间的延长和Mn2+浓度增大而提高。当Mn2+浓度为30 mg/L时,偏二甲肼的去除率与无催化剂时相比有了较大的提高。当30 MPa、500℃、3.6 s和Mn2+浓度为30 mg/L时,COD去除率高达99.6%。更多还原

【Abstract】 The catalytic oxidation of unsymmetrical dimethy-hydrazine in supercritical water was investigated over a oxidation catalyst Mn²⁺ and oxidant H₂O₂ in a tubular continuous flow reactor at 24～（30 MPa）,400～（500℃）.The effects of temperature,pressure,residence time and concentration of oxidant Mn²⁺ on the destruction of unsymmetrical dimethy-hydrazine were also studied.Results indicate that unsymmetrical dimethy-hydrazine can be decomposed effectively by catalytic supercritical water oxidation.The elimination efficiency of unsymmetrical dimethy-hydrazine was significantly improved as reaction temperature,pressure,residence time and oxidant Mn²⁺ concentration increased.As Mn²⁺ concentration was（30 mg）/L.the destruction of unsymmetrical dimethy-hydrazine was much higher than no-catalyst.The 99.6% COD removal was achieved at（30 MPa）,500℃ and（30 mg）/L Mn²⁺ in 3.6 s.更多还原