The investigation on thermal decomposition of TBP/n-dodecane-HNO3 mixtures

Since several "red oil" explosion accidents have occurred in the spent fuel reprocessing process, which is mainly due to the mix of HNO 3 and organic solvent at high temperature, the reaction between HNO 3 , TBP and n- dodecane at different conditions were studied to simulate the evaporation concentration process. The temperature and pressure changes were observed, and the main liquid and gas components were analyzed qualitatively and quantitatively by using FTIR and GC/MS. Furthermore, the reaction mechanism is also concluded. It is hope to provide some basic data to design the standards and safety limits in evaporation concentration process of spent fuel reprocessing.