Mass transfer of Er(III) between HBTMPTP dissolved in n-heptane and HAc-NaAc

The rate of extraction of Er(III) from aqueous acetate solutions at 0. 2 mol/L ionic strength by HBTMPTP in n-heptane was studied by using a constant interfacial area cell with laminar flow at (30+/- 0. 5)degrees C. The interfacial activity of HBTMPTP was investigated at n-heptane/0. 2 mol/L (H, Na)Ac (pH=5. 00) interface, The rate of Er(III) extraction was measured at different chemical compositions by varying hydrogen ion, HBTMPTP, Cyanex 302 and chlorine ion concentrations, The effect of stirring speed, temperature and special interfacial area on the rate of extraction was also studied. The results showed that, under the conditions of the experiments, the overall rate is diffusion controlled, that the impurities of Cyanex 302 have the effect of synergistic extraction.

铒在HBTMPTP-正庚烷/水溶液间的传质动力学

在 ( 3 0± 0 .5)℃下 ,用层流恒界面池研究了铒在 HBTMPTP-正庚烷 -0 .2 mol/ L( H,Na) Ac萃取体系中的传质动力学 .测定了该体系的界面张力 ,考察了水相酸度、萃取剂浓度、氯离子浓度、温度和比界面对萃取速率的影响 .实验表明 ,在本实验条件下 ,萃取过程属于扩散控制过程 .Cyanex3 0 2中的杂质具有动力学的协萃作用

Studies on synergistic extraction of Sc(III) with HBTMPTP and Cyanex 925

The synergistic extraction of Sc(III) from H2SO4 solution with bis(2, 4, 4-trimethylpentyl)monothiophosphinic acid(HBTMPTP, HL) and branched chain alkyl phosphine oxide mixture (Cyanex 925, B) in n-hexane has been investigated, The results indicated that synergistic effect was showed in low acidity (c(H2SO4) < 0.25 mol/L). The composition of the extracted complex of Sc(III) has been determined to be Sc(HL2)(2)B-3(SO4)(1/2) by the method of slope analysis, The mechanism of the synergistic extraction of Sc(III) may be : Sc3+ + 2(HL)(2(O)) + 3B((O)) + 1/2SO(4)(2-)reversible arrow(K12)Sc(HL2)(2)B-3(SO4)(1/2(O)) + 2H(+) ScL(HL2)(2(O)) + 3B((O)) + H+ + 1/2SO(4)(2-)reversible arrow(beta')Sc(HL2)(2)B-3(SO4)(1/2(O)) + 1/2(HL)(2(O)) Sc(SO4)(1.5)B-2(O) + B-(O) + 2(HL)(2(O))reversible arrow(beta')Sc(HL2)(2)B-3(SO4)(1/2(O)) + 2H(+) + SO42- Their equilibrium constants have been calculated to be lgK(13)=6.77+/-0.12, lg beta'=7.71, lg beta '' = 0.10, respectively, The IR spectra and FAB-MS of the saturated synergistic extraction complex of Sc(III) have been discussed as well.

Studies on synergistic extraction of rare earths(III) with HBTMPTP and primary amine N1923

The synergistic extraction of rare earths(III) with binary systems containing HBTMPTP and primary amine N1923 from sulfuric acid medium was observed, The syner gistic extraction factor(R) decreased with increasing atomic number of lanthanides. Through the methods of slope analysis, constant mole and saturation titration, the synergistic extraction stoichiometry was obtained, The thermodynamic function was calculated, The IR spectra of the saturated synergistic extraction completely confirmed the mechanism.

HBTMPTP与伯胺N1923对稀土元素(Ⅲ)的协同萃取

研究了二（2，4，4-三甲基戊基）单硫代膦酸（HBTMPTP，HL）和伯胺N1923的正己烷溶液从硫酸介质中对稀土元素（Ⅲ）的协同萃取．并以La（Ⅲ）为例，用斜率法、恒摩尔法和饱和法确定了协萃配合物的组成为（RNH3）3L2La（SO4）2，计算了协萃配合物的生成常数及热力学函数，观测了协萃配合物的IR谱.

HBTMPTP与Cyanex 925协同萃取Sc(Ⅲ)的研究

研究了二（2，4，4-三甲基戊基）单硫代膦酸（HBTMPTP，HL）和支链三烷基氧化膦（Cyanex925，B）的正己烷溶液在H2SO4介质中对Sc（III）的萃取性能，结果表明，在较低酸度（CH2SO4〈0．25mol／L）时存在协同效应，用斜率法确定了Sc（III）的协萃配合物的组成为Sc（HL2）2B3（SO4）1／2，计算了协萃反应的平衡常数，讨论了协萃配合物的IR谱和FAB－MS．

HBTMPTP与HPMBP协同萃取稀土元素

研究了二（２，４，４－三甲基戊基）单硫代膦酸（ＨＢＴＭＰＴＰ，ＨＬ）和１－苯基－３－甲基－４－苯甲酰基吡唑酮－５（ＨＰＭＢＰ，ＨＡ）的苯溶液在ＨＮＯ３介质中对三价稀土元素的萃取性能。结果表明，在ＨＮＯ３介质中存在协同效应，并且对三价重稀土元素存在反协同效应。以Ｌａ（Ⅲ）为例，用斜率法确定了它在ＨＮＯ３介质中所生成的协萃配合物的组成为ＬａＮＯ３·ＨＬ２·Ａ·２ＨＡ，计算了协萃反应的平衡常数，并观测了饱和协萃配合物的ＩＲ谱。

Studies on the roles of different components in Cyanex 302 for rare earth ions extraction and separation

In this paper, the extractabilities of Cyanex 302 and purified Cyanex 302 (hereafter HBTMPTP or HA) in heptane have been compared by extracting the scandium, yttrium, lanthanum, and gadolinium from hydrochloric acid solutions. The roles of the different components in Cyanex 302 on lanthanum extraction have been analyzed. The result demonstrates that the Cyanex 302 has a higher extractability than HBTMPTP, which perhaps originates from the interaction among the components in Cyanex 302. Especially for R3PO, obviously synergistic effect can be observed in the lower pH range and extraction mechanism of lanthanum using the mixture of HBTMPTP and TOPO has been deduced to be:where (HA)(2) and B denote the dimeric form of HBTMPTP and TOPO, respectively. At the same time, the separation abilities of Cyanex 302 and HBTMPTP on the rare earth elements have been compared. Also, the effect of temperature on the extraction with Cyaenx 302, HBTMPTP and the mixture of HBTMPTP and TOPO has also been discussed with thermodynamic functions Delta H, Delta S, and Delta G calculated.