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

Solvent extraction of nitric acid, uranium(VI) and thorium(IV) by N,N,N',N'-tetrahexylsuccinylamide 1 first-author 1 1 2 2 3 Laiyang Agricultural College, Laiyang 265200 Laiyang Agricultural College, Laiyang 265200 Shanghai Institute of Nuclear Research, the Chinese Academy of Sciences, Shanghai 201800 Shanghai Institute of Nuclear Research, the Chinese Academy of Sciences, Shanghai 201800 Department of Chemistry, Shandong University, Jian 250100 Department of Chemistry, Shandong University, Jian 250100 A new kind of diamide N,N,N',N'-tetrahexylsuccinylamide (THSA) was synthesized, characterized and used for the extraction of HNO 3 , 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 (LiNO 3 ) 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 HNO 3 is HNO 3 ·THSA. THSA·(HNO 3 ) 2 and THSA·(HNO 3 ) 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'-tetrahexylsuccinylamide Nitric acid Uranium(VI) Thorium(IV) Back extraction Salting-out agent References SHEN C H , BAO B R , J Nucl Radiochem (in Chinese) , 1993 , 15 ( 4 ): 243 ~ J Nucl Radiochem (in Chinese) Musikas C , Sep Sci Technol , 1988 , 23 ( 12/130 ): 121 Sep Sci Technol Nair G M , Prabhu D R , Mahajan G R et al . Sol Extr Ion Exch , 1993 , 11 ( 5 ): 813 Sol Extr Ion Exch WANG Y S , SHEN C H , ZHU J K et al . J Radioanal Nucl Chem Let , 1996 , 212 ( 2 ): 101 J Radioanal Nucl Chem Let WANG Y S , SUN G X , XIE D F et al . J Radioanal Nucl Chem Let , 1996 , 214 ( 2 ): 67 J Radioanal Nucl Chem Let WANG Y S , SUN S X , YANG Y Z et al . J Radioanal Nucl Chem Let , 1997 , 218 ( 1 ): 123 J Radioanal Nucl Chem Let WANG Y S , SUN G X , BAO B R et al . J Radioanal Nucl Chem Let , 1997 , 219 ( 1 ): 119 J Radioanal Nucl Chem Let WANG Y S , BAO B R , CAO W G et al . J Radioanal Nucl Chem Let , 1997 , 222 ( 1 ): 279 J Radioanal Nucl Chem Let WANG Y S , SUN G X , BAO B R et al . J Radioanal Nucl Chem Let , 1997 , 224 ( 1~2 ): 151 J Radioanal Nucl Chem Let WANG Y S , CAI Q F , TAN X F et al . J Radioanal Nucl Chem Let , 1998 , 226 ( 1~2 )( in press ) J Radioanal Nucl Chem Let Stanley R S , Wolf K , Organnic founctional group prepartions , Vol 1 . New York : Academic Press , 1968 , 277 Organnic founctional group prepartions Musikas C , Hubert H . Sol Extr Ion Exch , 1987 , 5 ( 1 ): 151 Sol Extr Ion Exch Charonnel M C , Musikas C . Sol Extr Ion Exch , 1988 , 6 ( 3 ): 461 Sol Extr Ion Exch BAO B R , BAO Y Z , SHEN C H et al . J Radioanal Nucl Chem Let , 1992 , 162 ( 2 ): 391 J Radioanal Nucl Chem Let Tian Q Z , Hughes M A . Proceedings of ISEC'93, Vol.1 London and New York : Published for SCI Elsevier Applies Science , 1993 , 404 1998-05-03 1999-02-01 2021-02-05 1999 Nuclear Science and Techniques 1 10