General Aspects of Ionic Activities in Aqueous Solutions

Vera, Juan H.; Wilczek-Vera, Grażyna

doi:10.1016/b978-0-12-409547-2.14284-2

Cited by 2 publications

(4 citation statements)

References 52 publications

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“…The investigation of ACI has attracted much attention. , This is because ACI can be useful in the characterization of transport phenomena in electrolyte systems , and are also helpful in our understanding of biological systems (sodium–potassium pump), membrane processes, as well as salting-in and salting-out effects. , Moreover, recently, in some modeling studies, ACI have been considered, as discussed below. − …”

Section: Literature Studies On Activity Coefficients Of Individual Ionsmentioning

confidence: 99%

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Analysis of Some Electrolyte Models Including Their Ability to Predict the Activity Coefficients of Individual Ions

Sun

Solms

Kontogeorgis

2020

Ind. Eng. Chem. Res.

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Section: Literature Studies On Activity Coefficients Of Individual Ionsmentioning

confidence: 99%

“…Most of electrochemistry and chemical engineering involves salt solutions (often highly concentrated), where understanding of the activity coefficients of individual ions (ACI), which depends on the concentration of each component in the solution, facilitates the understanding of complex aqueous electrolyte systems …”

Section: Introduction and Motivationmentioning

confidence: 99%

Analysis of Some Electrolyte Models Including Their Ability to Predict the Activity Coefficients of Individual Ions

Sun

Solms

Kontogeorgis

2020

Ind. Eng. Chem. Res.

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“…Detailed definitions of this property are given in textbooks, for example. 5,13 Although some authors publish individual ionic activity coefficients, 14,15 we have in this work only used mean ionic activity coefficients (MIAC), which are defined on a molality basis (indicated by a superscript m) as ( )…”

Section: Data Investigatedmentioning

confidence: 99%

“…The prime refers to the asymmetric definition: its value becomes one at infinite dilution in the solvent. Detailed definitions of this property are given in textbooks, for example. , Although some authors publish individual ionic activity coefficients, , we have in this work only used mean ionic activity coefficients (MIAC), which are defined on a molality basis (indicated by a superscript m ) as where the subscripts “+” and “–” point to anion and cation, respectively, while r and n are their respective stoichiometric coefficients (here always 1), and ν = r + n is their sum, here 2.…”

Section: Data Investigatedmentioning

confidence: 99%

Data Analysis for Electrolyte Systems: A Method Illustrated on Alkali Halides in Water

et al. 2021

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In the recent years, the need to improve the thermodynamic models, particularly making them more precise and predictable for complex systems, has increased [Industrial Requirements for Thermodynamics and Transport PropertiesHendriksE. Hendriks, E. Ind. Eng. Chem. Res.2010491113111141 Industrial Requirements for Thermodynamic and Transport PropertiesKontogeorgisG. Kontogeorgis, G. Ind. Eng. Chem. Res.20216049875013 The complexity of electrolyte systems is due to the strong interactions between ions, the hydration forces that take place during salt dissociation, and the physical forces at high concentrations of solute. Consequently, the existing thermodynamic electrolyte models show some limitations and are far from being completely optimized for industrial simulations. Thermodynamics based on electrolyte mixtures and mixed solvents requires further development and research [PolingB. E. Poling, B. E. The Properties of Gases and LiquidsMcGraw-Hill Education2001The EleTher Joint Industrial Project (JIP) aims at promoting research in this field. A practical workflow is under development where the first stage consists in analyzing the data. The present work is part of this larger scope and presents a strategy to analyze the internal and external consistency of experimental data for electrolyte mixtures. The focus is on alkali halide salts in water. Internal consistency allows testing the quality of data by confronting them to each other and using the thermodynamic relationships between these data. For that purpose, the data are confronted with a model that was initially optimized and the deviations are analyzed. For this purpose, the electrolyte non-random two-liquid (eNRTL) thermodynamic model was selected. Some deviations are attributed to the model inadequacy (high temperature or high molalities). Others are to be attributed to data inconsistencies. On the other hand, the objective of external consistency is to evaluate the consistency between different systems of the same family. The Bromley model is used for this purpose, as it contains a single adjustable parameter. Investigating the trend of this parameter with type of compound or with temperature may provide valuable information regarding the underlying physics, in addition to identifying outliers.

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General Aspects of Ionic Activities in Aqueous Solutions

Cited by 2 publications

References 52 publications

Analysis of Some Electrolyte Models Including Their Ability to Predict the Activity Coefficients of Individual Ions

Analysis of Some Electrolyte Models Including Their Ability to Predict the Activity Coefficients of Individual Ions

Data Analysis for Electrolyte Systems: A Method Illustrated on Alkali Halides in Water

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