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 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 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 novel unsymmetrical extractant N,N′-dimethyl-N,N′-dioctylmalonamide (DMDOMA) was prepared by reaction of diethyl malonate with N-methyl octanamine. The extraction mechanism and the behavior of uranyl nitrate wit...The novel unsymmetrical extractant N,N′-dimethyl-N,N′-dioctylmalonamide (DMDOMA) was prepared by reaction of diethyl malonate with N-methyl octanamine. The extraction mechanism and the behavior of uranyl nitrate with DMDOMA employed cyclohexane as diluent were studied. The effects of concentrations of nitric acid, sodium nitrate, extractant and also the temperature on the extraction were considered. The stoichiometry of the extracted species is and the coordination of extracted species was suggested based on the IR data. The value of ΔH of extraction is -26.9 ± 0.80 kJ·mol-1. The value of the apparent extraction constant is 133.88 ± 17.92, which shows that the optimization of extractant structure improves the extractability of malonamide for uranyl nitrate.展开更多
利用乙二胺与双丙酮丙烯酰胺间的Michael加成反应合成了含酮羰基的新型扩链剂N,N′-二双丙酮丙酰胺基乙二胺,用1 H NMR和13 C MNR证实了结构。聚己二酸新戊二醇酯、异佛尔酮二异氰酸酯(IPDI)、二羟甲基丙酸(DMPA)预聚后加入N,N′-二双...利用乙二胺与双丙酮丙烯酰胺间的Michael加成反应合成了含酮羰基的新型扩链剂N,N′-二双丙酮丙酰胺基乙二胺,用1 H NMR和13 C MNR证实了结构。聚己二酸新戊二醇酯、异佛尔酮二异氰酸酯(IPDI)、二羟甲基丙酸(DMPA)预聚后加入N,N′-二双丙酮丙酰胺基乙二胺扩链得到含酮聚氨酯预聚物,预聚物经分散、乙二胺扩链后得到聚氨酯分散体。研究了含酮扩链剂用量对分散体及其膜性能的影响。结果表明随N,N′-二双丙酮丙酰胺基乙二胺的增加,聚氨酯分散体的粒径增大、黏度减小。己二酸二酰肼交联后能明显提高WPU胶膜的力学性能。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 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 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 novel unsymmetrical extractant N,N′-dimethyl-N,N′-dioctylmalonamide (DMDOMA) was prepared by reaction of diethyl malonate with N-methyl octanamine. The extraction mechanism and the behavior of uranyl nitrate with DMDOMA employed cyclohexane as diluent were studied. The effects of concentrations of nitric acid, sodium nitrate, extractant and also the temperature on the extraction were considered. The stoichiometry of the extracted species is and the coordination of extracted species was suggested based on the IR data. The value of ΔH of extraction is -26.9 ± 0.80 kJ·mol-1. The value of the apparent extraction constant is 133.88 ± 17.92, which shows that the optimization of extractant structure improves the extractability of malonamide for uranyl nitrate.
文摘利用乙二胺与双丙酮丙烯酰胺间的Michael加成反应合成了含酮羰基的新型扩链剂N,N′-二双丙酮丙酰胺基乙二胺,用1 H NMR和13 C MNR证实了结构。聚己二酸新戊二醇酯、异佛尔酮二异氰酸酯(IPDI)、二羟甲基丙酸(DMPA)预聚后加入N,N′-二双丙酮丙酰胺基乙二胺扩链得到含酮聚氨酯预聚物,预聚物经分散、乙二胺扩链后得到聚氨酯分散体。研究了含酮扩链剂用量对分散体及其膜性能的影响。结果表明随N,N′-二双丙酮丙酰胺基乙二胺的增加,聚氨酯分散体的粒径增大、黏度减小。己二酸二酰肼交联后能明显提高WPU胶膜的力学性能。
