摘要
利用一套连续式超临界水氧化实验装置,以H2O2为氧化剂,在480～550℃、30MPa条件下,进行了超临界水氧化偏二甲肼实验,建立了COD去除宏观动力学方程。实验结果表明,在超临界条件下,偏二甲肼氧化分解很快,当温度为550℃、压力为30MPa、停留时间为5.8s时,COD去除率可高达93.5%以上。偏二甲肼的去除率随反应温度升高、停留时间延长而提高。在H2O2过量50%的情况下,偏二甲肼氧化分解反应对有机物为1.13级,对氧气为0.29级;反应活化能Ea为44.65kJ·mol-1;指前因子A为4.93×103。
This study aims to carry out supercritical water oxidation （SCWO） of unsymmetrical dimethy-hydrazine in a tubular continuous flow reactor system with an H2O2 oxidant, at a temperature range between 480 ℃ and 550 ℃ at the pressure of 30 MPa. The study also described the general principle for the COD removal by using a power-law. The results show that the oxidative decomposition of unsymmetrical dimethy-hydrazine can be done quickly with a high COD removal speed up to 93.5 % within 5.8 s at 550 ℃ and 30 MPa on the condition that oxygen supply is sufficient. The oxidative decomposition efficiency of unsymmetrical dimethy-hydrazine and COD removal efficiency can thus be significantly improved as reaction temperature and residence time increased. The experiments also show that within the temperature range 480 - 550 ℃ , the COD removal efficiency is strongly temperature dependent. On the condition of 480 - 550 ℃ , 30 MPa and 50% H2O2 excess, the reaction can proceed in 1.13 order with COD and 0.29 order with oxygen. The activation energy is 44.65 kJ·mol^-1 with the Arrhenius pre-exponential factor being 4.93 × 10^3.
出处
《安全与环境学报》
CAS
CSCD
2005年第4期17-19,共3页
Journal of Safety and Environment
基金
陕西省教育厅基金资助项目(04JK307)
陕西理工学院基金资助项目(SLQ0321)
关键词
环境化学
偏二甲肼
超临界水
氧化
动力学
environmental chemistry
unsymmetrical dimethy-hydrazine
supercritical water
oxidation
kinetics
