A New Model Incorporating Ion Dissociation for Sodium Chloride Solutions near the Critical Point of Water
| Autor: | John L. Oscarson, and Saowarux Fuangswasdi, Reed M. Izatt, Bruce A. Palmer |
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| Rok vydání: | 2001 |
| Předmět: |
Aqueous solution
General Chemical Engineering Sodium chemistry.chemical_element Thermodynamics General Chemistry Industrial and Manufacturing Engineering Dissociation (chemistry) Supercritical fluid Dilution Dissociation constant chemistry Critical point (thermodynamics) Physics::Chemical Physics Equilibrium constant |
| Zdroj: | Industrial & Engineering Chemistry Research. 40:2176-2182 |
| ISSN: | 1520-5045 0888-5885 |
| DOI: | 10.1021/ie000930r |
| Popis: | A new model is reported that combines a Helmholtz energy expression developed by Anderko and Pitzer and is valid in the critical region of water with a mathematical equation developed by Wood and co-workers describing the dissociation of aqueous sodium chloride. The new model takes into account the effects of ionic dissociation, hard-sphere interactions, and dipole−dipole interactions. The new model and the Anderko-Pitzer model were tested by comparing measured heats of dilution of NaCl in the near-critical and supercritical regions of water with those calculated using these models. The heats of dilution of aqueous NaCl solutions calculated using the Anderko−Pitzer model were in poor agreement in the dilute concentration region with those reported by Busey et al. and Chen et al. and with new results reported here. The agreement between experimental heats of dilution and those calculated using the Anderko−Pitzer model depended on the variables solute concentration, temperature, and pressure. This agreement... |
| Databáze: | OpenAIRE |
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