Thermal Stability of KU-2*8 Sulfocation Exchanger in Contact with Nitric Acid under Isochoric Conditions

Resumo

The thermal stability of KU-2*8 cation exchanger mixed with 4 and 12 mol/L nitric acids is studied via differential scanning calorimetry under isochoric conditions. The temperatures of interaction of KU-2*8 cation exchanger with 4 and 12 mol/L nitric acids at temperatures less than 200°С are 310–320 and 1730–1890 kJ/kg, respectively. The heat dissipation for KU-2*8 cation exchanger mixed with nitric acid is found to take two stages within a chosen temperature range. The negative influence of irradiation on thermal stability of KU-2*8 cation exchanger in contact with 4 mol/L nitric acid under isochoric conditions is shown to expand the temperature range of exothermal processes to 60–180°С at the absorbed dose of 2 MGy instead 110–185°С for nonirradiated samples, as well as to increase the thermal effect to a value of 430 kJ/kg.