Influence of Electrolytes on Liquid−Liquid Extraction
Influence of Electrolytes on Liquid−Liquid Extraction
复制标题
电解质对液液萃取的影响
DOI：
--
复制
发表时间：
1998
期刊：
影响因子：
--
通讯作者：
A. Schwerin
中科院分区：
文献类型：
--
作者：
A. Pfennig;A. Schwerin
电解质对带电物种的分配行为的强烈影响在用于萃取的水相和水-有机两相系统中得到证明。的影响进行建模与扩展的Albertsson模型，考虑到共存相之间的静电势差。通过添加不同的盐，所考虑的物种的分配系数可以改变50倍。接近界面的静电势，然后描述的泊松方程的直接集成。计算结果与Albertsson模型计算的体相间伽伐尼势一致。讨论了包括表面活性剂在内的离子种类对萃取传质的影响。最后，聚结的液体分散体的研究与电解质存在于系统中。如果适当的话，添加浓度约为1 mol/m3的盐，在某些系统中沉降时间可以变化1000倍。实验…
The strong influence of electrolytes on the partition behavior of charged species is demonstrated in aqueous and aqueous−organic two-phase systems used for extraction. The effects are modeled with an extended Albertsson model which takes into account the electrostatic potential difference between coexisting phases. The partition coefficient of a species regarded may change by a factor of 50 by the addititon of different salts. The electrostatic potential close to the interface is then described by direct integration of the Poisson equation. The results agree with those for the Galvani potential between the bulk phases obtained from the Albertsson model. The influence of ionic species including surfactants on the mass transfer in extraction is discussed. Finally, the coalescence of liquid dispersions is investigated with electrolytes present in the system. The settling times can be varied by a factor of 1000 in some systems, if appropriate salts are added at concentrations around 1 mol/m3. The experimental...