A new equation of state is proposed to correlate the osmotic pressure data for aqueous lysozyme solutions with (NH 4) 2SO 4, (NH 4) 2C 2O 4 and (NH 4) 2HPO 4 at ionic strengths of 13.5 mol/kg and pH 4, 7 or...A new equation of state is proposed to correlate the osmotic pressure data for aqueous lysozyme solutions with (NH 4) 2SO 4, (NH 4) 2C 2O 4 and (NH 4) 2HPO 4 at ionic strengths of 13.5 mol/kg and pH 4, 7 or 8 with only one adjustable parameter instead of the classical Derjaguin Landau Verwey Overbeek (DLVO) theory. The Carnahan Starling equation represents the contribution of the hard sphere repulsion to the osmotic pressure. The attractive dispersion interaction is represented by the Lennard Jones potential expressed by the equation of Cotterman et al. based on perturbation theory. The double layer repulsion interaction is represented by Yukawa potential expressed by the equation of state of Duh and Mier Y Teran based on mean spherical approximation. The total average relative deviation of the correlation of the osmotic pressure data is 1.68%.展开更多
The LIQUAC model is often used to predict vapor-liquid equilibria, osmotic coefficients, and mean ion activity coefficients for electrolyte systems. This paper describes a thermodynamic method to analyze solid-liquid ...The LIQUAC model is often used to predict vapor-liquid equilibria, osmotic coefficients, and mean ion activity coefficients for electrolyte systems. This paper describes a thermodynamic method to analyze solid-liquid equilibrium for electrolytes in mixed solvents solutions using the LIQUAC model. The KCI solubilities in mixed water-ethanol solutions are predicted with the LIQUAC model and its original interaction parameters. This method is also used to obtain new K^＋-ethanol interaction parameters in the LIQUAC model from the solubility data. The new interaction parameters accurately predict the vapor-liquid equilibrium data of K^＋ salts （including KCI, KBr, and KCOOCH3） in mixed water-ethanol solutions. The results illustrate the flexibility of the LIQUAC model which can predict not only vapor-liquid equilibrium but also solid-liquid equilibrium in mixed solvent systems.展开更多
基金the National Natural Science Foundationof China(No. 2 9736 170 )
文摘A new equation of state is proposed to correlate the osmotic pressure data for aqueous lysozyme solutions with (NH 4) 2SO 4, (NH 4) 2C 2O 4 and (NH 4) 2HPO 4 at ionic strengths of 13.5 mol/kg and pH 4, 7 or 8 with only one adjustable parameter instead of the classical Derjaguin Landau Verwey Overbeek (DLVO) theory. The Carnahan Starling equation represents the contribution of the hard sphere repulsion to the osmotic pressure. The attractive dispersion interaction is represented by the Lennard Jones potential expressed by the equation of Cotterman et al. based on perturbation theory. The double layer repulsion interaction is represented by Yukawa potential expressed by the equation of state of Duh and Mier Y Teran based on mean spherical approximation. The total average relative deviation of the correlation of the osmotic pressure data is 1.68%.
基金Supported by the National Natural Science Foundation of China (No. 20276034), the National Key Basic Research Development (973) Program of China (No. 2003CB615701), and the National High-Tech Research and Development (863) Program of China (No. 2003AA328020)
文摘The LIQUAC model is often used to predict vapor-liquid equilibria, osmotic coefficients, and mean ion activity coefficients for electrolyte systems. This paper describes a thermodynamic method to analyze solid-liquid equilibrium for electrolytes in mixed solvents solutions using the LIQUAC model. The KCI solubilities in mixed water-ethanol solutions are predicted with the LIQUAC model and its original interaction parameters. This method is also used to obtain new K^＋-ethanol interaction parameters in the LIQUAC model from the solubility data. The new interaction parameters accurately predict the vapor-liquid equilibrium data of K^＋ salts （including KCI, KBr, and KCOOCH3） in mixed water-ethanol solutions. The results illustrate the flexibility of the LIQUAC model which can predict not only vapor-liquid equilibrium but also solid-liquid equilibrium in mixed solvent systems.
