A New Gibbs Energy Model for Obtaining Thermophysical Properties of Aqueous Electrolyte Solutions |
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Authors: | K Khederlou G R Pazuki V Taghikhani M Vossoughi C Ghotbi |
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Institution: | (1) Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran;(2) Institute for Nano-science and Nano-technology, Sharif University of Technology, Tehran, Iran |
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Abstract: | In this paper, a new Gibbs energy model is proposed to study the thermophysical properties of aqueous electrolyte solutions
at various temperatures. The proposed model assumes that the electrolytes completely dissociate in solution. The model also
has two temperature-independent adjustable parameters that were regressed using experimental values of the mean ionic activity
coefficients (MIAC) for 87 electrolyte solutions at 298.15 K. Results from the proposed model for the MIAC were compared with
those obtained from the E-Wilson, E-NRTL, Pitzer and the E-UNIQUAC models, and the adjustable model parameters were used directly
to predict the osmotic coefficients at this temperature. The results showed that the proposed model can accurately correlate
the MIAC and predict the osmotic coefficients of the aqueous electrolyte solutions better on the average than the other models
studied in this work at 298.15 K. Also, the proposed model was examined to study the osmotic coefficient and vapor pressure
for a number of aqueous electrolyte solutions at high temperatures. It should be stated that in order to calculate the osmotic
coefficients for the electrolyte solutions, the regressed values of parameters obtained for the vapor pressure at high temperatures
were used directly. The results obtained for the osmotic coefficients and vapor pressures of electrolyte solutions indicate
that good agreement is attained between the experimental data and the results of the proposed model. In order to unequivocally
compare the results, the same experimental data and same minimization procedure were used for all of the studied models. |
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Keywords: | Electrolyte solution Local composition Gibbs energy Thermophysical properties |
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