Extraction of uranium(VI) with N-octanoylpyrrolidine in sulfonated kerosene

Extraction of uranium with N-octanoylpyrrolidine (OPOD) in sulfonated kerosene from aqueous nitric acid media has been studied. The dependence of the extraction distribution ratios on the concentrations of aqueous nitric acid, extractant, salting-out agent and the temperature was investigated. The constitution of extracted complex was established, and the related thermodynamic functions were calculated.

Kinetic studies on the solvent extraction of uranium(VI) from phosphoric acid solution with HDEHP using laser-induced optical fiber fluorimetry

The laser-induced optical fiber fluorimetry has been used for the first time to analyse the concentration of uranium(VI) in the kinetic studies on the extraction of uranium(VI) between 0.5 mol/L H_3PO_4 solution and HDEHP-cyclohexane system with Lewis cell. The effects of stirring speed, temper- ature and concentration of uranium(VI) and HDEHP on the rate of extraction were examined. These data show that the extraction rate of uranium(VI) in this system is controlled by the chemical reaction process at the interface. The rate equations and the rate constants of the forward and reverse ex- tractions were obtained. The mechanism of the extraction has been discussed.

N,N,N',N'-tetrabutylmalonamide as a new extractant for extraction of nitric acid and uranium(VI)

Ｎ，Ｎ，Ｎ′，Ｎ′ｔｅｔｒａｂｕｔｙｌｍａｌｏｎａｍｉｄｅａｓａｎｅｗｅｘｔｒａｃｔａｎｔｆｏｒｅｘｔｒａｃｔｉｏｎｏｆｎｉｔｒｉｃａｃｉｄａｎｄｕｒａｎｉｕｍ（ＶＩ）ＷａｎｇＹｏｕＳｈａｏ，ＳｕｎＧｕｏＸｉｎ，ＬｉＹｕＬａｎ，ＢａｏＢ...

The dodecyltolylsulfoxide extraction of uranium(VI)

１ＩｎｔｒｏｄｕｃｔｉｏｎＴｒｉｎｂｕｔｙｌｐｈｏｓｐｈａｔｅ（ＴＢＰ）ｈａｓｂｅｎｕｓｅｄｆｏｒｓｅｖｅｒａｌｄｅｃａｄｅｓａｓｔｈｅｍｏｓｔｓｕｃｅｓｆｕｌｅｘｔｒａｃｔａｎｔｆｏｒｒｅｃｏｖｅｒｙｏｆｕｒａｎｉｕｍｆｒｏｍｓｐｅｎｔｎｕｃｌ...

Effect of diluents on the extraction of uranium (VI) with N-oetanoyl-2-methylpiperidine

The extraction of uranium ((Ⅵ) from nitric acid solution with N-octanoyl-2-methylpiperidine (OMPPD)in eight diluents and the dependence of distribution ratio on temperature and concentrations of both aqueous nitricacid and OMPPD were investigated. The interaction among OMPPD, the extracted species and diluent has been dis-cussed. The experiments show that the extraction ability of OMPPD decreases gradually for eight diluents in the fol-lowing order: benzene, toluene, n-octane, sulfonated kerosene, cyclohexane, carbon tetrachloride, 1,2-dichloroetheneand chloroform. It cannot be interpreted only on the basis of polarity of diluents.

Preparation of N, N'-diacylpiperazine and its extraction property for U(Ⅵ)

A novel extractant, N, N’-diacylpiperazine (DAPEZ), was synthesized and characterized for the first time. Its extraction property for U(VI) from aqueous nitric acid media has been studied. The effects of concentration of nitric acid and extractant on the distribution ratio were examined and the extraction mechanism were discussed.

锕系、镧系元素分离中新萃取剂的研究(III)——新萃取剂HMBMPPT的合成及其对铀(VI)的萃取研究

通过酰基化、氯化、硫化反应合成了新的酰代吡唑硫酮,即4-(4-甲氧基)-苯甲酰基-2,4-二氢-5-甲基-2-苯基-3H-吡唑硫酮-3(HMBMPPT)。产物的结构用红外、氢核磁共振谱、质谱、元素分析及X射线衍射进行了表征。研究了以氯仿为溶剂HMBMPPT 在硝酸介质中对铀(VI)的萃取行为,考察了稀释剂、萃取剂浓度、酸度、温度及盐析剂浓度对分配比的影响。同时,对萃取配合物的化学组成及萃取机理也进行了分析和讨论。

TBP对N,N-二丁基辛酰胺萃取铀的影响

研究了Ｎ，Ｎ－二丁基辛酰胺（ＤＢＯＡ）从硝酸介质中萃取铀的机理。考察了水相酸度、盐析剂ＬｉＮＯ３浓度以及萃取剂浓度对萃取分配比的影响，结合红外光谱分析了萃合物结构。ＴＢＰ对ＤＢＯＡ萃取铀的影响比较复杂，在低ＴＢＰ浓度下，两种萃取剂具有协同效应，但随着ＴＢＰ浓度的增大出现反协同效应。红外光谱表明两种中性萃取剂混合后分子间没有明显的相互作用，反协同效应可能是ＴＢＰ改变了有机溶液的极性所致。利用斜率法确定了协萃络合物的组成。