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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.
ELE contains 8,457 data sets (104,944 data points) from 1,116 references for 696 components and 1,516 different systems (4,472 binary, 3,790 ternary and 195 higher
systems) (Version 2011).
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).
Downloads
| 2006 | DDB 2006 - Tutorial: Data Bank Manual VLE, HPV, ELE | | Tutorial (PDF) |
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) |
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