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Extraction Behavior of Strontium from Nitric Acid Solution with N,N, N^’,N^’-Tetraisobutyl Diglycolamide

S.-D. Dinga^,*, T. Yang^a, N. Liu^b and L. Zhang^a

^aCollege of Chemistry, Sichuan University, Chengdu, 610064, P. R. China
^bKey Laboratory of Radiation Physics and Technology of Education Ministry of China, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, P. R. China

The extraction behaviors of strontium from nitric acid solution were investigated with N,N,N^’,N^’-tetraisobutyl diglycolamide (TiBDGA). Effects of acidity, diluents, concentration of extractant and temperature on the distribution ratio of strontium (D_Sr) were examined. The stoichiometry of the extracted molecule was Sr²⁺:TiBDGA of 1:3. The apparent extraction equilibrium concentration constant logK_ex was 3.25. The enthalpy change ΔH and entropy change ΔS were -55.6 kJ mol^-1 and -124 J mol^-1 K^-1, respectively. The extraction is an exothermic process. Through two strip stages, strontium could be stripped effectively by 0.01 M nitric acid solution.

Keywords: N,N,N’,N’-Tetraisobutyl diglycolamide, Strontium, Extraction, Diglycolamide, High level liquid waste