ELE - Vapor-Liquid Equilibria of Electrolyte Systems

The ELE data bank contains data for vapor-liquid equilibria of mixtures containing electrolytes as well as osmotic coefficients and mean ionic activity coefficients of the electrolyte species. It's primary focus is to supply data on the effect of electrolyte components on the separation factor of the volatile solvents and the total pressure or boiling point of an electrolyte solution as well as mean ionic activity coefficients for deriving e.g. Pitzer coefficients for the calculation of salt solubilities.

This data file was first delivered in 1995 and since then has grown significantly. A full list of systems is available in our DDB Online Search system. The page might take some seconds to load because of its size.

The following plot shows typical data from ELE describing the effect of lithium nitrate (3) on the vapor-liquid equilibrium between methyl acetate (1) and methanol (2) at 1 atm. All data were taken from the DDB.

The plot on the right shows the dependence of the mean ionic activity coefficient for different salts at 25°C in water as function of concentration.

At infinite dilution, the value is solely determined by the Debye-Hückel limiting law and only depends on the number and charges of the cations and anions. This means that the same limiting mean ionic activity coefficient is found for sodium chloride and potassium chloride and that also the values for the 2-1 and 1-2 salts sodium sulfate and calcium chloride are identical.

At higher electrolyte concentrations though, these values change very strongly and are usually modeled using empirical parameters regressed to the experimental data (e.g. Debye-Hückel plus linear, Pitzer, ...).

Both vapor-liquid equilibria and mean ionic activity coefficients are of great importance for the correct description of the phase behavior of electrolyte mixtures. Further important data can be found in DDB-ESLE (salt solubilities) and DDB-EGLE (gas solubilities in electrolyte solutions).

Please contact DDBST to receive the information about prices and license options.


Selected Scientific Papers

2009    Prediction of solubilities of salts, osmotic coefficients and vapor-liquid equilibria for single and mixed solvent electrolyte systems using the LIQUAC model    Huang J., Li J., Gmehling J.    Journal    Fluid Phase Equilib., 275, 1, 8 20 (2009)
2006    Prediction of Phase Equilibria with Strong Electrolytes with the Help of the Volume Translated Peng-Robinson Group Contribution Equation of State (VTPR)    Collinet E., Gmehling J.    Journal    Fluid Phase Equilib., 246, 1-2, 111-118 (2006)
2006    Modified LIQUAC and Modified LIFAC-A Further Development of Electrolyte Models for the Reliable Prediction of Phase Equilibria with Strong Electrolytes    Kiepe J., Noll O., Gmehling J.    Journal    Ind.Eng.Chem.Res., 45, 7, 2361 2373 (2006)
2005    gE Model for Single- and Mixed-Solvent Electrolyte Systems. 3. Prediction of Salt Solubilities in Aqueous Electrolyte Systems    Li J., Lin Y., Gmehling J.    Journal    Ind.Eng.Chem.Res., 44, 5, 1602 1609 (2005)
2004    Group Contribution Methods - Ideal Tools for the Development of Chemical Processes    Gmehling J., Ahlers J.    conference paper    Conference, 38, 11, 1 14 (2004)
2004    Application of the PSRK Model for Systems Containing Strong Electrolytes    Kiepe J., Horstmann S., Fischer K., Gmehling J.    Journal    Ind.Eng.Chem.Res., 43, 20, 6607 6615 (2004)
1999    Prediction of vapor-liquid equilibria in mixed-solvent electrolyte systems using the group contribution concept    Yan W., Topphoff M., Rose C., Gmehling J.    Journal    Fluid Phase Equilib., 162, 6, 97 113 (1999)
1994    A gE Model for Single and Mixed Solvent Electrolyte Systems. 1. Model and Results for Strong Electrolytes    Li J., Polka H.-M., Gmehling J.    Journal    Fluid Phase Equilib., 94, 3, 89 114 (1994)
1994    A gE Model for Single and Mixed Solvent Electrolyte Systems 2. Results and comparison with other models    Polka H.-M., Li J., Gmehling J.    Journal    Fluid Phase Equilib., 94, 3, 115 127 (1994)
1991    Development of Thermodynamic Models with a View to the Synthesis and Design of Separation Processes    Gmehling J.    conference paper    Conference, 5, 1, 1 14 (1991)

Selected Scientific Papers (Experimental Data)

2001    Effects of Lithium Nitrate on the Vapor-Liquid Equilibria of Methyl Acetate + Methanol and Ethyl Acetate + Ethanol    Topphoff M., Kiepe J., Gmehling J.    Journal    J.Chem.Eng.Data, 46, 5, 1333 1337 (2001)
1998    Measurement and Correlation of Isothermal Vapor-Liquid Equilibrium Data for the System Acetone+Methanol+Lithium Bromide    Yan W., Rose C., Zhu M., Gmehling J.    Journal    J.Chem.Eng.Data, 43, 4, 585 589 (1998)
1998    Isothermal Vapor-Liquid Equilibrium Data for the Acetone+Methanol+Lithium Nitrate System    Yan W., Rose C., Zhu M., Gmehling J.    Journal    J.Chem.Eng.Data, 43, 3, 482 485 (1998)
1997    Isothermal Vapor-Liquid Equilibrium Data for the Ethanol+Ethyl Acetate+ Sodium Iodide system at five Temperatures    Yan W., Rose C., Gmehling J.    Journal    J.Chem.Eng.Data, 42, 3, 603 608 (1997)
1994    Effects of Calcium Nitrate on the Vapor-Liquid Equilibria of Ethanol + Water and 2- Propanol + Water    Polka H.-M., Gmehling J.    Journal    J.Chem.Eng.Data, 39, 3, 621 624 (1994)
1991    Low-Pressure Isobaric Vapor-Liquid Equilibria of Ethanol/Water Mixtures Containing Electrolytes    Meyer T., Polka H.M., Gmehling J.    Journal    J.Chem.Eng.Data, 36, 3, 340 342 (1991)