烷基膦酸载体液膜中Cd(II)的传输

采用内耦合大块液膜分离技术，通过考察料液相pH值、温度、载体浓度以及解析相组成对Cd(Ⅱ）迁移速率的影响，研究了以烷基膦酸为流动载体的液膜中镉的迁移规律，并建立了渗透系数与pH值、温度以及载体浓度之间的关系方程。结果表明，Cd(Ⅱ）以CdR2·2HR(Kex值为3.58×10^6)配合物形式在液膜中传输，增加载体浓度或升高温度，迁移速率明显升高，最佳传质条件为料液相pH值4.5-5.1、载体浓度5.0%-7.5%、温度298－308K。

二烷基膦酸载体液膜中Zn(II)的传输研究

研究了以烷基膦酸 PC-88A为流动载体的液膜中 Zn( II)的迁移规律 ,并考察了料液相 p H、温度、载体浓度及解析相组成对 Zn( II)迁移过程的影响。结果表明 ,增加载体浓度或升高温度 ,Zn( II)迁移速率明显增大 ,料液相 p H在 2 .4～ 5.1时可获得较大的 Zn( II)迁移速率。确定了最佳传质条件 ,探讨了各种因素影响机理 ,实现了 Zn( II)与 Cd( II)的分离。

液膜分离技术及其研究应用进展

论述了液膜分离技术的传质机理,介绍了该技术的研究现状、应用情况及发展前景。

Hollow fiber liquid-supported membrane technology for enantioseparation of racemic salbutamol by combinatorial chiral selectors

Enantioseparation of salbutamol solute was carried out in liquid-supported membrane by using a polyvinylidene fluoride hollow-fiber module. The enantioselective transport of solute was facilitated by combinatorial chiral selectors, which were dissolved in toluene organic solvent. The effects of molar concentration ratios of salbutamol to combinatorial chiral selectors, and the pH value of buffer solution on enantioseparation were investigated. The results show that when the molar concentration ratio is 2∶1∶1, the maximum separation factor and enantiomer excess are 1.49 and 19.74%, respectively, and the R-enantiomer flux is more than S-enantiomer; the pH value of buffer solution influences the performances of enantioseparartion obviously, and the appropriate range of pH value is 7.07.2.