N,N,N',N'-tetrabutylmalonamide as a new extractant for extraction of nitric acid and uranium(VI)

Wang You-Shao，

Sun Guo-Xin，

Li Yu-Lan，

Bao Bo-Rong，

Sun Xiao-Yu，

Mao Jia-Jun

Nuclear Science and Techniques

Vol.8, No.4

pp.232-235

Published in print 01 Nov 1997

36200

N,N,N',N'-tetrabutylmalonamide (TBMA) is synthesized and used for extraction of uranyl(II) ion from nitric acid media in a diluent composed of 50% 1,2,4-trimethyl benzene (TMB) and 50% kerosene(OK). The effects of nitric acid concentration, extractant concentration, temperature, salting-out agent (LiNO₃) and back extraction on distribution coefficients of uranyl(II) ion have been studied. The extraction of nitric acid is also studied. The main adduct of TBMA and HNO₃ is HNO₃ TBMA, and there are more than two kinds of adducts in 3.0 mol/L nitric acid solutions, such as HNO₃•TBMA, (HNO₃)₂•TBMA and (HNO₃)₃•TBMA. The complex formation of uranyl(II) ion, nitrate ion and TBMA (1:2:1) as extracted species is further confirmed by IR spectra of the saturated extraction of uranyl(II) ion with TBMA, and the values of thermodynamic parameters have also been calculated.

N,N,N',N'-tetrabutylmalonamide(TBMA)Solvent extractionUranium(VI)Salting-out agentBack extraction

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