Separation studies of uranium and thorium using di-2-ethylhexyl isobutyramide (D2EHIBA)
- Bhabha Atomic Research Centre, Mumbai (India). Radiochemistry Div.
The extraction behavior of di-2-ethylhexyl isobutyramide (D2EHIBA) in dodecane medium for U(VI), Th(IV), and fission products such as Zr, Ce, Eu, and Cs, and the structural material Fe, has been investigated over a wide range of nitric acid concentrations. It has been observed that whereas D{sub U} varies from <10{sup {minus}3} (pH 2.0)to 4.4 (6 M HNO{sub 3}) with 1 M ligand, the corresponding D{sub Th} values are 1.5 {times} 10{sup {minus}3} and 4 {times} 10{sup {minus}2}. In the presence of 250 g/L of Th, D{sub U} values are 8.6 (pH 2.0) and 2.2 (6 M HNO{sub 3}).D2EHIBA has been found to be a promising extractant of trace concentrations of U in the presence of macro amounts of Th. The extraction of fission products and Fe is found to be negligible. D2EHIBA is found to extract nitric acid predominantly as a 1:1 species (K{sub H} = 0.156 {+-} 0.048). U(VI) is extracted as a disolvate UO{sub 2}(NO{sub 3}){sub 2}{center_dot}2D2EHIBA (K{sub ex} = 0.87 {+-} 0.08).
- OSTI ID:
- 691497
- Journal Information:
- Separation Science and Technology, Vol. 34, Issue 13; Other Information: PBD: Sep 1999
- Country of Publication:
- United States
- Language:
- English
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