Measuring and modeling alcohol/salt systems

被引：67

作者：

Held, Christoph ^{[1
]}

Prinz, Axel ^{[1
]}

Wallmeyer, Viktoria ^{[1
]}

Sadowski, Gabriele ^{[1
]}

机构：

[1] Tech Univ Dortmund, Lab Thermodynam, Dept Biochem & Chem Engn, D-44227 Dortmund, Germany

来源：

CHEMICAL ENGINEERING SCIENCE | 2012年 / 68卷 / 01期

关键词：

Phase equilibria; Equation of state; Ternary solutions; Electrolytes; Osmotic coefficient; Mean ionic activity coefficient; AQUEOUS-ELECTROLYTE-SOLUTIONS; MEAN SPHERICAL APPROXIMATION; ASSOCIATING FLUID THEORY; WATER MIXED-SOLVENTS; METHANOL PLUS WATER; RESTRICTED PRIMITIVE MODEL; MULTIPLE-SALT SOLUTIONS; PERTURBED-CHAIN SAFT; MSA-NRTL MODEL; ACTIVITY-COEFFICIENTS;

D O I：

10.1016/j.ces.2011.09.040

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Liquid densities, osmotic coefficients, and mean ionic activity coefficients (MIAC) at 25 degrees C of single-salt alcohol (methanol and ethanol) solutions containing univalent ions were measured and modeled with the ePC-SAFT equation of state. In accordance with our previous work [Held, C., Cameretti, L.F., Sadowski, G., Fluid Phase Equlilib. 270 (2008) 87-96], only two solvent-specific ion parameters were adjusted to experimental solution densities and osmotic coefficients: the solvated ion diameter and the dispersion-energy parameter. ePC-SAFT was able to reproduce experimental data of the respective alcohol/salt systems with reasonable accuracy. Based on the solvent-specific ion-parameter sets, it is possible to predict densities and MIACs in ternary and quaternary water/alcohol(s)/salt solutions by introducing appropriate mixing rules that do not contain any additional fitting parameters. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：328 / 339

页数：12

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