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

Solvent extraction of uranium(VI) and thorium(IV) in nitric acid solution by N,N,N',N'-tetrabutyladipicamide 1 first-author 1 1 2 3 3 3 Shanghai Institute of Nuclear Research, the Chinese Academy of Sciences, Shanghai 201800 Shanghai Institute of Nuclear Research, the Chinese Academy of Sciences, Shanghai 201800 School of Chemistry and Chemical Engineering, Shanghai University, Shanghai 201800 School of Chemistry and Chemical Engineering, Shanghai University, Shanghai 201800 Analysis and Research Centre, Tongji University, Shanghai 200094 Analysis and Research Centre, Tongji University, Shanghai 200094 N,N,N'N'-tetrabutyladipicamide(TBAA) has been synthesized, and applied to the extraction of U(VI) and Th(IV) from nitric acid solutions in a diluent composed of 0.50 volume fraction 1,2,4-trimethyl benzene(TMB) and 0.50 volume fraction kerosene(OK). The effects of the aqueous nitric acid concentration, extractant concentration, salting-out agent (LiNO 3 ) and temperature on extraction ability of TBAA for U(VI) and Th(IV) have been studied. Back extraction of U(VI) and Th(IV) from organic phases were performed by dilute nitric acid. The compositions of extracted complexes, equilibrium constants and enthalpies of extraction reactions have also been estimated. The IR spectra of extraction of U(VI) and Th(IV) have been studied. N,N,N',N'-tetrabutyladipicamide(TBAA) Solvent extraction Uranium(VI) Tho- rium(IV) Back-extraction Salting-out effect IR spectra References Siddall T H , III . J Inorg Nucl Chem , 1963 ; 25 : 883 J Inorg Nucl Chem Musikas C . Sep Sci Technol , 1988 ; 23 ( 12 and 13 ): 1211 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 Cuillerdier C , Musikas C , Hoel P et al . Sep Sci Technol , 1991 ; 26 ( 9 ): 1229 Sep Sci Technol Shen C H , Bao B R , Zhu J K et al . J Ra- dioanal Nucl Chem Letters , 1996 ; 212 ( 3 ): 187 J Ra- dioanal Nucl Chem Letters Bao B R , Bao Y Z , Shen C H et al . J Ra- dioanal Nucl Chem Articles , 1992 ; 162 ( 2 ): 39 J Ra- dioanal Nucl Chem Articles The Project Supported by National Natural Science Foundation of China 1996-10-28 1997-05-01 2021-02-05 1997 Nuclear Science and Techniques 2 08