Multicomponent diffusion in concentrated electrolyte solutions : effect of solvation.
Multicomponent diffusion in concentrated electrolyte solutions : effect of solvation.
复制标题
浓电解质溶液中的多组分扩散：溶剂化作用。
DOI：
10.1002/aic.690330309
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发表时间：
1987
期刊：
影响因子：
3.7
通讯作者：
E. Graham
中科院分区：
文献类型：
--
作者：
N. Pinto;E. Graham
本文提出了一种估算浓多组分体系中电解质扩散系数的方法。该方法是基于Stefan-Maxwell通量方程。显式表达式已开发的唯象输运系数。这些表达式包括溶剂化，粘度和离子相互作用的影响。它已被证明，多组分扩散行为可以与相应的单电解质和示踪剂扩散的情况下。因此，溶剂化效应估计从单电解质的数据，离子-离子相互作用的影响，从示踪剂扩散研究。该方法已被测试的三元系统氯化钠-氯化钾，在浓度高达3.0 M，并为相应的单一电解质和示踪剂扩散的情况下，在浓度高达4.0 M。在一般情况下，该方法预测的现象系数值在1.5%的实验值为单价系统。
A method is presented to estimate the diffusivities of electrolytes in concentrated multicomponent systems. The method is based on the Stefan-Maxwell flux equations. Explicit expressions have been developed for the phenomenological transport coefficients. These expressions incorporate the effects of solvation, viscosity, and ionic interactions. It has been shown that multicomponent diffusion behavior can be related to corresponding single-electrolyte and tracer diffusion cases. Thus, solvation effects are estimated from single-electrolyte data, and ion-ion interaction effects are obtained from tracer diffusion studies. The method has been tested for the ternary system NaCl-KCl, at concentrations of up to 3.0 M, and for corresponding single-electrolyte and tracer diffusion cases at concentrations of up to 4.0 M. In general, the method predicts phenomenological coefficient values within 1.5% of the experimental values for univalent systems.