Solvent extraction of nitric acid, uranium(VI) and thorium(IV) by N,N,N',N'-tetrahexylsuccinylamide

TAN Xufang，

WANG Youshao，

TAN Taizhe，

YANG Yanzhao，

BAO Borong，

SUN Sixiu

Nuclear Science and Techniques

Vol.10, No.1

pp.18-23

Published in print 01 Feb 1999

60700

A new kind of diamide N,N,N',N'-tetrahexylsuccinylamide (THSA) was synthesized, characterized and used for the extraction of HNO₃, U(VI) and Th(IV) in a diluent composed of 0.5 volume fraction 1,2,4-trimethy benzene(TMB) and 0.5 volume fraction kerosene(OK). Extraction distribution coefficients of U(VI) and Th(IV) as functions of aqueous nitric acid concentration, extractant concentration, temperature and salting-out agent (LiNO₃) have been studied, and it is found that THSA as an extractant is superior to TBP for extraction of U(VI) and Th(IV). Back extraction was also studied. At low acidity, the main adduct of THSA and HNO₃ is HNO₃·THSA. THSA·(HNO₃)₂ and THSA·(HNO₃)₃ are also found at high acidity. The compositions of extracted species, apparent equilibrium constants and enthalpies of extraction reactions have also been calculated.

N;N;N';N'-tetrahexylsuccinylamideNitric acidUranium(VI)Thorium(IV)Back extractionSalting-out agent

References

SHEN C H, BAO B R, J Nucl Radiochem (in Chinese), 1993, 15(4): 243~

Musikas C, Sep Sci Technol, 1988, 23(12/130): 121

Nair G M, Prabhu D R, Mahajan G R et al. Sol Extr Ion Exch, 1993, 11(5): 813

WANG Y S, SHEN C H, ZHU J K et al. J Radioanal Nucl Chem Let, 1996, 212(2): 101

WANG Y S, SUN G X, XIE D F et al. J Radioanal Nucl Chem Let, 1996, 214(2): 67

WANG Y S, SUN S X, YANG Y Z et al. J Radioanal Nucl Chem Let, 1997, 218(1): 123

WANG Y S, SUN G X, BAO B R et al. J Radioanal Nucl Chem Let, 1997, 219(1): 119

WANG Y S, BAO B R, CAO W G et al. J Radioanal Nucl Chem Let, 1997, 222(1): 279

WANG Y S, SUN G X, BAO B R et al. J Radioanal Nucl Chem Let, 1997, 224(1~2): 151

WANG Y S, CAI Q F, TAN X F et al. J Radioanal Nucl Chem Let, 1998, 226(1~2)(in press)

Stanley R S, Wolf K, Organnic founctional group prepartions, Vol 1. New York: Academic Press, 1968, 277

Musikas C, Hubert H. Sol Extr Ion Exch, 1987, 5(1): 151

Charonnel M C, Musikas C. Sol Extr Ion Exch, 1988, 6(3): 461

BAO B R, BAO Y Z, SHEN C H et al. J Radioanal Nucl Chem Let, 1992, 162(2): 391

Tian Q Z, Hughes M A. Proceedings of ISEC'93, Vol.1 London and New York: Published for SCI Elsevier Applies Science, 1993, 404