Study on the extraction and separation of rare earth with new extractants is important in the rare earth chemistry and nuclear reprocessing. In this work, the extraction of Ce?with N,N,N′,N′ tetrabutylmalonamide (TB...Study on the extraction and separation of rare earth with new extractants is important in the rare earth chemistry and nuclear reprocessing. In this work, the extraction of Ce?with N,N,N′,N′ tetrabutylmalonamide (TBMA) in toluene from nitrate media has been investigated. The effect of the concentration of nitric acid, TBMA and salting out agent (LiNO3) and also the temperature on the distribution ratios was examined. The stoichiometries of the extracted complexes were determined to be Ce(NO3)3·3TBMA and Ce(NO3)3·4TBMA, respectively. The ap<IMG SRC="IMAGE/06170035.JPG" HEIGHT=11 WIDTH=24>parent extraction constants and the enthalpy of the extraction were calculated based on the extraction data, which are logKex1=3.97, logKex2=4.75 and =-31.25kJ·mol-1, respectively. The IR spectra of the loaded organic phase supported the suggested extraction mechanism.展开更多
Study on the extraction and separation of rare earth with new extractants is important in the rare earth chemistry and hydrometallurgy.In this work,the extraction behavior of TBMA employing n hexane 20% n octanol,benz...Study on the extraction and separation of rare earth with new extractants is important in the rare earth chemistry and hydrometallurgy.In this work,the extraction behavior of TBMA employing n hexane 20% n octanol,benzene and toluene as diluents toward Tb(Ⅲ) has been investigated.The effect of the concentrations of nitric acid,lithium nitrate and extractant and also the temperature on the extraction distribution ratio has been studied in different diluents.The stoichiometry of the extracted species of Tb(Ⅲ) conforms to be Tb(NO 3) 3·3TBMA.An attempt has been made to determine the structure of the extracted species based on the data of IR and mole展开更多
The new room-temperature molten salt was prepared based on LiTFSI[LiNC(SO 2CF 3) 2] with OZO(C 3H 5NO 2) which were not reported in literature. Its thermal and electrochemical properties were studied by differential s...The new room-temperature molten salt was prepared based on LiTFSI[LiNC(SO 2CF 3) 2] with OZO(C 3H 5NO 2) which were not reported in literature. Its thermal and electrochemical properties were studied by differential scanning calorimetry, ac impedance spectroscopy and cyclic voltammertry respectively. The results indicated that the structure symmetry of the molecule was depressed and the extent of charges delocalization was expanded, because of introducing oxygen atom of differential electronegativity in OZO molecule. DSC analysis showed that the LiTFSI-OZO molten salt has the excellent thermal stability and its eutectic temperature is below about 223.15 K. Meanwhile, the conductivity of LiTFSI-OZO molten salt at a molar ratio of 1∶4.5 is 0.75×10 -3 S/cm at 298.15 K and 3.50×10 -3 S/cm at 333.15 K. CV analysis showed that the electrochemical window of the sample is about 4 V.展开更多
The behavior of N,N,N′,N′-tetrabutylmalonamide(TBMA) in extraction of Tm(Ⅲ) using toluene as diluent has been investigated. The effects of the concentrations of TBMA, nitric acid, lithium nitrate, and temperature o...The behavior of N,N,N′,N′-tetrabutylmalonamide(TBMA) in extraction of Tm(Ⅲ) using toluene as diluent has been investigated. The effects of the concentrations of TBMA, nitric acid, lithium nitrate, and temperature on the extraction have been studied. The composition of the extracted species was found to be Tm(NO3)3·3TBMA as characterized by IR spectrometry. The apparent equilibrium constant of extraction has been determined to be (0.61±0.18) L^6/mol^-6 at 298 K. Enthalpy of the extraction reaction is -27.61 kJ/mol.展开更多
The title compound N,N′ ditosyl 3 methoxyimino 1,5 diaza cyclooctane(4) has been prepared by two methods,the reactions of all steps are carried out under very moderate conditions and the overall yield is high.The str...The title compound N,N′ ditosyl 3 methoxyimino 1,5 diaza cyclooctane(4) has been prepared by two methods,the reactions of all steps are carried out under very moderate conditions and the overall yield is high.The structures of the new compounds 2,3,4 are characterized by elemental analysis,IR, 1H NMR and MS spectroscopy.展开更多
文摘Study on the extraction and separation of rare earth with new extractants is important in the rare earth chemistry and nuclear reprocessing. In this work, the extraction of Ce?with N,N,N′,N′ tetrabutylmalonamide (TBMA) in toluene from nitrate media has been investigated. The effect of the concentration of nitric acid, TBMA and salting out agent (LiNO3) and also the temperature on the distribution ratios was examined. The stoichiometries of the extracted complexes were determined to be Ce(NO3)3·3TBMA and Ce(NO3)3·4TBMA, respectively. The ap<IMG SRC="IMAGE/06170035.JPG" HEIGHT=11 WIDTH=24>parent extraction constants and the enthalpy of the extraction were calculated based on the extraction data, which are logKex1=3.97, logKex2=4.75 and =-31.25kJ·mol-1, respectively. The IR spectra of the loaded organic phase supported the suggested extraction mechanism.
文摘Study on the extraction and separation of rare earth with new extractants is important in the rare earth chemistry and hydrometallurgy.In this work,the extraction behavior of TBMA employing n hexane 20% n octanol,benzene and toluene as diluents toward Tb(Ⅲ) has been investigated.The effect of the concentrations of nitric acid,lithium nitrate and extractant and also the temperature on the extraction distribution ratio has been studied in different diluents.The stoichiometry of the extracted species of Tb(Ⅲ) conforms to be Tb(NO 3) 3·3TBMA.An attempt has been made to determine the structure of the extracted species based on the data of IR and mole
文摘The new room-temperature molten salt was prepared based on LiTFSI[LiNC(SO 2CF 3) 2] with OZO(C 3H 5NO 2) which were not reported in literature. Its thermal and electrochemical properties were studied by differential scanning calorimetry, ac impedance spectroscopy and cyclic voltammertry respectively. The results indicated that the structure symmetry of the molecule was depressed and the extent of charges delocalization was expanded, because of introducing oxygen atom of differential electronegativity in OZO molecule. DSC analysis showed that the LiTFSI-OZO molten salt has the excellent thermal stability and its eutectic temperature is below about 223.15 K. Meanwhile, the conductivity of LiTFSI-OZO molten salt at a molar ratio of 1∶4.5 is 0.75×10 -3 S/cm at 298.15 K and 3.50×10 -3 S/cm at 333.15 K. CV analysis showed that the electrochemical window of the sample is about 4 V.
文摘The behavior of N,N,N′,N′-tetrabutylmalonamide(TBMA) in extraction of Tm(Ⅲ) using toluene as diluent has been investigated. The effects of the concentrations of TBMA, nitric acid, lithium nitrate, and temperature on the extraction have been studied. The composition of the extracted species was found to be Tm(NO3)3·3TBMA as characterized by IR spectrometry. The apparent equilibrium constant of extraction has been determined to be (0.61±0.18) L^6/mol^-6 at 298 K. Enthalpy of the extraction reaction is -27.61 kJ/mol.
文摘The title compound N,N′ ditosyl 3 methoxyimino 1,5 diaza cyclooctane(4) has been prepared by two methods,the reactions of all steps are carried out under very moderate conditions and the overall yield is high.The structures of the new compounds 2,3,4 are characterized by elemental analysis,IR, 1H NMR and MS spectroscopy.
