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
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
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
In this work,the extraction behavior of TBMA employing benzene as a diluents for Yb（Ⅲ）was investigated.The effect of the concentrations of nitric acid,lithium nitrate and extractant and also the temperature on the ...In this work,the extraction behavior of TBMA employing benzene as a diluents for Yb（Ⅲ）was investigated.The effect of the concentrations of nitric acid,lithium nitrate and extractant and also the temperature on the extraction distribution ratio was studied.The complexe of TBMA with Yb（Ⅲ） was characterized by IR.The stoichiometries of extracted species was established to be Yb（NO3）3·3TBMA,and the enthalpy of the extraction was found to be -29.46 kJ·mol-1.展开更多
The crystal structure of species Pr(NO3)3·2TBMA (TBMA=N,N,N′,N′-tetrabutyl malonamide) has been determined by X-ray diffraction. The compound crystallizes in the triclinic system, P1 space group, a=1.318 5(18) ...The crystal structure of species Pr(NO3)3·2TBMA (TBMA=N,N,N′,N′-tetrabutyl malonamide) has been determined by X-ray diffraction. The compound crystallizes in the triclinic system, P1 space group, a=1.318 5(18) nm, b=1.449(2) nm, c=1.494(2) nm, α=70.03(2)°, β=71.53(2)°, γ=83.75(2)°, V=2.546(6) nm3, Z=2, Mr=979.97, Dc=1.278 g·cm-3, F(000)=1 032, R1=0.054 7. In each molecule, the metal ion is 10-coordinate, being bonded to two nearly coplanar bidentate TBMA ligands and three bidentate nitrate ions, two of them located on each side of the plane defined by the TBMA ligands and the third one crossing the plane. The geometry can be best described in terms of pentagonal bipyramid with each bidentate nitrate occupying one site. The two coordinated C=O groups in TBMA are not parallel, the O(1)-C(1)...C(3)-O(2) and O(3)-C(20)...C(22)-O(4) torsion angles are 129.73° and -48.43° respectively. The absorption bands belonging to the coordinated carbonyl vibration split into two peaks at 1 577.96 and 1 608.43 cm-1 respectively, which is caused by the different environment. The thermal decomposition of the complex is in three steps. CCDC: 231276.展开更多
The extraction behavior of N,N,N’,N’-tetrabutylglutaramide（TBGA）employing cyclohexane as diluent toward La（Ⅲ）,Pr（Ⅲ）,Gd（Ⅲ）and Er（Ⅲ） investigated.The effect of the concentrations of nitric acid,lithium n...The extraction behavior of N,N,N’,N’-tetrabutylglutaramide（TBGA）employing cyclohexane as diluent toward La（Ⅲ）,Pr（Ⅲ）,Gd（Ⅲ）and Er（Ⅲ） investigated.The effect of the concentrations of nitric acid,lithium nitrate and extractant and also the temperature on the extraction distribution ratio was studied.The stoichiometry of the extracted species was Found to be M（NO3）3·3TBGA（M=La,Pr,Gd,Er）.The extraction mechanism was also discussed and the values of the enthalpy of extraction reaction was calculated.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 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In this work,the extraction behavior of TBMA employing benzene as a diluents for Yb（Ⅲ）was investigated.The effect of the concentrations of nitric acid,lithium nitrate and extractant and also the temperature on the extraction distribution ratio was studied.The complexe of TBMA with Yb（Ⅲ） was characterized by IR.The stoichiometries of extracted species was established to be Yb（NO3）3·3TBMA,and the enthalpy of the extraction was found to be -29.46 kJ·mol-1.
文摘The crystal structure of species Pr(NO3)3·2TBMA (TBMA=N,N,N′,N′-tetrabutyl malonamide) has been determined by X-ray diffraction. The compound crystallizes in the triclinic system, P1 space group, a=1.318 5(18) nm, b=1.449(2) nm, c=1.494(2) nm, α=70.03(2)°, β=71.53(2)°, γ=83.75(2)°, V=2.546(6) nm3, Z=2, Mr=979.97, Dc=1.278 g·cm-3, F(000)=1 032, R1=0.054 7. In each molecule, the metal ion is 10-coordinate, being bonded to two nearly coplanar bidentate TBMA ligands and three bidentate nitrate ions, two of them located on each side of the plane defined by the TBMA ligands and the third one crossing the plane. The geometry can be best described in terms of pentagonal bipyramid with each bidentate nitrate occupying one site. The two coordinated C=O groups in TBMA are not parallel, the O(1)-C(1)...C(3)-O(2) and O(3)-C(20)...C(22)-O(4) torsion angles are 129.73° and -48.43° respectively. The absorption bands belonging to the coordinated carbonyl vibration split into two peaks at 1 577.96 and 1 608.43 cm-1 respectively, which is caused by the different environment. The thermal decomposition of the complex is in three steps. CCDC: 231276.
文摘The extraction behavior of N,N,N’,N’-tetrabutylglutaramide（TBGA）employing cyclohexane as diluent toward La（Ⅲ）,Pr（Ⅲ）,Gd（Ⅲ）and Er（Ⅲ） investigated.The effect of the concentrations of nitric acid,lithium nitrate and extractant and also the temperature on the extraction distribution ratio was studied.The stoichiometry of the extracted species was Found to be M（NO3）3·3TBGA（M=La,Pr,Gd,Er）.The extraction mechanism was also discussed and the values of the enthalpy of extraction reaction was calculated.
