Abstract
The thermal stability of a novel CHON (Carbon, Hydrogen, Oxygen and Nitrogen) based ionic liquid: Methyltrioctylammonium nitrate ([N1888] [NO3]), used for the separation of actinides and fission products was studied using an adiabatic calorimeter (in air ambience under heat-wait-search (HWS) mode) for the first time. The decomposition study of [N1888] [NO3] was accomplished in the presence and absence of nitric acid and a diglycolamide based extractant: N,N,N',N'-tetra(2-ethylhexyl) di-glycolamide (T2EHDGA) which is also incinerable in nature. The neat ionic liquid system showed stability up to 491 K followed by the self decomposition irrespective of the presence or absence of 0.1 M T2EHDGA. The thermal decomposition data on the nitric acid equilibrated ionic liquid phases were generated and were compared with that of ionic liquid – nitric acid biphase. A remarkable difference in the exothermic excursions and derived thermo-kinetic parameters corroborated the impact of nitric acid on the thermal stability of [N1888][NO3].
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