期刊
FLUID PHASE EQUILIBRIA
卷 459, 期 -, 页码 138-157出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.fluid.2017.12.002
关键词
Electrolytes; Mixed solvents; Dielectric constant; ePPC-SAFT; Salting-out
资金
- Tuck Foundation chair on Thermodynamics for Biofuels
- PROSIM company
Models for mixed-solvent strong electrolytes, using an equation of state (EoS) are reviewed in this work. Through the example of ePPC-SAFT (that includes a Born term and ionic association), the meaning and the effect of each contribution to the solvation energy and the mean ionic activity coefficient are investigated. The importance of the dielectric constant is critically reviewed, with a focus on the use of a salt-concentration dependent function. The parameterization is performed using two adjustable parameters for each ion: a minimum approach distance (sigma(MSA)) and an association energy (epsilon(AB)). These two parameters are optimized by fitting experimental activity coefficient and liquid density data, for all alkali halide salts simultaneously, in the range 298 K-423 K. The model is subsequently tested on a large number of available experimental data, including salting out of Methane/Ethane/CO2/H2S. In all cases the deviations in bubble pressures were below 20% AADP. Predictions of vapor-liquid equilibrium of mixed solvent electrolyte systems containing methanol, ethanol are also made where deviations in bubble pressures were found to be below 10% (AADP). (C) 2017 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据