超临界水氧化技术处理磷酸三丁酯的实验研究

Experiment Study on Treating Tributyl Phosphate by Supercritical Water Oxidation

放射性废磷酸三丁酯是一种常见的放射性有机废物,其妥善处理对于核工业的可持续发展至关重要。本文采用间歇式超临界水氧化设备,对磷酸三丁酯的氧化分解进行了探究。结果表明,磷酸三丁酯的降解产物无毒害物,气相产物为CO_2,液相产物为CO_3^(2-)、PO_4^(3-)及未反应的有机物,证实了超临界水氧化技术处理磷酸三丁酯的可行性。通过对反应温度、反应压力等因素对有机物去除率影响的研究,确定了磷酸三丁酯超临界水氧化反应的最优化反应条件:反应温度450℃、反应压力24 MPa、磷酸三丁酯初始浓度0.05mol/L、过氧化氢过量1倍。在此反应条件下,停留时间为10min时,有机物去除率可达99.9%。

Tributyl phosphate （TBP） is a typical kind of radioactive organic waste , proper treatment of w hich is very important to the sustainable development of nuclear industry .A batch type equipment of supercritical water oxiadation （SCWO） was estab‐lished to explore the oxygenolysis of TBP .The results show that the degradation prod‐ucts of TBP do not contain hazardous matters ,with CO2 in gas phase while CO2 -3 ,PO3 -4 and unreacted organics in liquid phase ,confirming the feasibility of processing TBP by SCWO technology .The effects of reaction temperature ,pressure ,and other factors on the decomposition ratio of organics were studied and the optimal reaction condition was determined as 450 ℃ ,24 M Pa ,TBP initial concentration of 0.05 mol/L and H2 O2 of one time excess rate .Under such condition ,while the residence time is 10 min ,the decomposition ratio of organics reaches 99.9% .