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Citation: Sun Guoxin, Han Jingtian, Li Yulan, Bao Borong, Bao Meng, Jiang Runtian, Zhao Shuying. Extraction of U(Ⅵ) in Nitric Acid by N, N, N',N'-Tetrahexylmalonamide[J]. Chinese Journal of Applied Chemistry, ;1998, 15(4): 29-32. shu

Extraction of U(Ⅵ) in Nitric Acid by N, N, N',N'-Tetrahexylmalonamide

1.
Shanghai Institute of Nuclear Research, Chinese Academy of Sciences, Shanghai 201800;
2.
Department of helled Chemistry, Shandong Institute of Building Materials Industry, Ji'na

Received Date: 19 November 1997
Revised Date: 20 April 1998

The extraction of nitric acid and U(Ⅵ) from nitric acid solutions with N, N, N', N'-tetrahexylmalonamide (THMA) in toluene has been carried out. The dependences of the extraction distribution ratios on the concentrations of aqueous nitric acid, extractant and sodium nitrate and the temperature have been investigated. The extraction stoichiometry has been established and the structure of the extracted complex was analyzed by IR spectrometry. The extraction constants of nitric acid and U(Ⅳ) with THMA and the reaction enthalpy were calculated. In comparison with the extractability of N, N, N', N'-tetrabutylmalonamide, it shows that increase in the alkyl chain longth lowering the formation of the third phase and decreases the extractability of the amides.
- tetrahexylmalonamide,
- uranium extraction,
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