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11 results on '"Ruszczyński, Łukasz"'

4. Reliable Correlation for Liquid–Liquid Equilibria outside the Critical Region

Author

Ruszczyński, Łukasz, Zubov, Alexandr, O’Connell, John P., and Abildskov, Jens

Abstract

A simple model for binary liquid–liquid equilibrium data correlation is explored. The model describes liquid–liquid equilibrium in terms of Henry’s law and unsymmetrically normalized activity coefficients in each phase. A procedure for parameter estimation including an approach to initial guesses, uncertainty analysis of regression results, obtained parameters, and predicted mole fractions has been formulated. The procedure is applied to three cases: hydrocarbons + water, ionic liquids + water, and nitroethane + hydrocarbons. The model has four parameters in the most basic formulation. Depending upon the available data, this number can be extended in a systematic fashion. We compare results of correlation to results obtained with a four-parameter nonrandom two-liquid (NRTL) equation and COSMO-SAC. In general, the new model does nearly as well as NRTL. Advantages of the presented model are a simple form and a parameter set that can be extended in a systematic fashion with an interpretation in terms of thermodynamic properties. The model may be developed further for validation of experimental data.

Published
2024
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10. Excess Enthalpies in Binary Systems of Isomeric C8 Aliphatic Monoethers with Acetonitrile and Their Description by the COSMO-SAC Model.

Author

Ruszczyński, Łukasz, Reda, Mateusz, Królikowski, Marek, Gliński, Marek, and Hofman, Tadeusz

Subjects
*ENTHALPY, *BINARY metallic systems, *ISOMERS, *ALIPHATIC compounds, *ETHERS, *ACETONITRILE
Abstract

The excess enthalpies at 298.15 and 308.15 K for six binary mixtures of acetonitrile + C8 aliphatic ether {heptyl methyl ether CH3OnC7H15, or ethylhexyl ether C2H5OnC6H13, or pentyl propyl ether nC3H7OnC5H11, or isopentyl propyl ether nC3H7Oi C5H11, or dibutyl ether nC4H9OnC4H9, or butyl isobutyl ether nC4H9OiC4H9} have been determined by isothermal titration calorimetry using the TA Instruments (model TAM III) calorimeter. The possibility of the COSMO-SAC model to account for the thermodynamic differences between these systems has been tested. [ABSTRACT FROM AUTHOR]

Published
2016
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11. Excess Enthalpies in Binary Systems of Isomeric C8 Aliphatic Monoethers with Acetonitrile and Their Description by the COSMO-SAC Model.

Author

Ruszczyński, Łukasz, Reda, Mateusz, Królikowski, Marek, Gliński, Marek, and Hofman, Tadeusz

Subjects
*ENTHALPY, *BINARY mixtures, *CARBON, *ALIPHATIC compounds, *ETHERS, *ACETONITRILE
Abstract

The excess enthalpies at 298.15 and 308.15 K for six binary mixtures of acetonitrile + C8 aliphatic ether {heptyl methyl ether CH3OnC7H15, or ethylhexyl ether C2H5OnC6H13, or pentyl propyl ether nC3H7OnC5H11, or isopentyl propyl ether nC3H7Oi C5H11, or dibutyl ether nC4H9OnC4H9, or butyl isobutyl ether nC4H9OiC4H9} have been determined by isothermal titration calorimetry using the TA Instruments (model TAM III) calorimeter. The possibility of the COSMO-SAC model to account for the thermodynamic differences between these systems has been tested. [ABSTRACT FROM AUTHOR]

Published
2015
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