【摘要】 为达到放射性废树脂无害化减容，本文使用连续式超临界水氧化装置研究阴、阳混合离子交换树脂在超/亚临界水中的溶解、降解行为，考察其温度、压力、停留时间等因素的影响规律；利用拉曼光谱、扫描电镜、CODcr测定等手段对反应后的水样和残渣进行表征分析。结果表明：在超临界条件或亚临界条件下，提高温度、停留时间和加入解聚剂有利于树脂的溶、降解。混合树脂在高温高压下官能团和聚苯乙烯骨架发生断裂，形成以单环芳烃为主的中间产物，继而生成苯类衍生物或降解为其他小分子有机物，溶解在超/亚临界水中。更多还原

【Abstract】 In order to achieve the harmless reduction of radioactive waste resin, the dissolution and degradation behavior of the negative and positive mixed ion exchange resin in super/sub-critical water were studied by using a continuous supercritical water oxidation device, and the effects of temperature, pressure and residence time were investigated. The water samples and residue were characterized by Raman spectroscopy, scanning electron microscopy and CODcr. The results showed that increasing temperature, residence time and adding depolymerizer were beneficial to the dissolution and degradation of the resin under supercritical or subcritical conditions. The functional group and polystyrene skeleton of the mixed resin are fractured under high temperature and pressure to form intermediates dominated by mono aromatic hydrocarbons, which then generate benzene derivatives or degrade into other small molecular organic matter and dissolve in super/subcritical water.更多还原