Journal
FLUID PHASE EQUILIBRIA
Volume 424, Issue -, Pages 90-104Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.fluid.2015.11.005
Keywords
COSMO-RS-PDHS; Variable hydration of ions and polyols; Activity coefficient and water activity of electrolytes; Water activity of polyols; COSMO-radii of ionic elements
Funding
- Na- integrated program [ANR-09-ALIA-013-01]
- ALGO-H2 project [ANR-10-BIOE-0004]
- French National Research Agency
- French company ROQUETTE FRERES
- Agence Nationale de la Recherche (ANR) [ANR-10-BIOE-0004] Funding Source: Agence Nationale de la Recherche (ANR)
Ask authors/readers for more resources
Recently, we have introduced the COSMO-RS-PDHS model, i.e. a new tool to predict activities and activity coefficients of electrolytes in binary {water-electrolyte) systems. However, the fixed hydration assumption used in this early stage of the development of model, limits its range of validity (from 0 to 6 molal). The present study aims at overcoming this limitation through the development of a new chemical model that handles the successive hydration reactions of the chemical species. Using the COSMO-RS values of chemical potentials of hydrated species, the equilibrium constants of these successive hydration reactions are predicted. The resulting model accurately predicts water activities and activity coefficients of electrolytes in concentrated solutions (up to 20 molal). COSMO-RS-PDHS is finally used to predict water activities in several {water-polyol} systems. The predicted activity coefficients and water activity results are in very good agreement with experimental data, even by using the default COSMO-radii (if available like in {water-LiCl}, {water-NaCl} or {water-polyol} solutions), as well as by using our proposed set of COSMO-radii which enables to predict activity coefficients in the {water-KCl} mixture where the potassium is not yet included in the parameterized set of COSMO-radii in the current state of art of COSMO-RS. (C) 2015 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available