Vapour Liquid Equilibrium

Staff

Facilities and Research Interests

  • Vapour-Liquid-Equilibrium of mixtures and electrolyte solutions
  • High precision vapour pressure measurements between an electrolyte solution and a pure solvent.

Available intrumentation

  • dynamic method: Vapour-Liquid-Equilibrium Apparatus by FISCHER
    measurements at 25 -250 ºC, < 4 bar
  • static method: Apparatus build by Roland Neueder 1982
    high precision measurements at 25 ºC, < 1000 Torr
  • HP 6890 Series Gaschromatograph with Headspace Sampler HP7694
    Two split/splitless injectors, FID and TCD detector

History

  • Dr. Roland Neueder (1982): Dampfdruckuntersuchungen an methanolischen Lösungen schwach assoziierter Elektrolyte
  • Dr. Gerhard Lauermann (1985): Dampfdruckmessungen an nichtwäßrigen Elektrolytlösungen und ihre statistisch thermodynamische Beschreibung über einen weiten Konzentrationsbereich
  • Prof. Dr. Werner Kunz (1988): Vapour Pressure Measurements and Statistical-Mechanical Theories for the Determination of Thermodynamic and Structural Properties of Electrolytes in Acetonitrile and Methanol
  • Dr. Harald Wittmann (1996): Osmotische Koeffizienten und Aktivitätskoeffizienten von LiClO4, LiBr und verschiedenen Tetraalkylammoniumbromiden in nichtwäßrigen Lösungsmitteln aus Dampfdruckmessungen

Publications

  • J.Barthel, R.Neueder, H.Poepke, and H.Wittmann
    Osmotic Coefficients and Activity Coefficients of Nonaqueous Electrolyte Solutions. Part I. Lithium Perchlorate in the Protic Solvents Methanol, Ethanol, and 2-Propanol J. Solution Chem. (submitted)

  • J.Barthel, R.Neueder, H.Poepke, and H.Wittmann
    Osmotic Coefficients and Activity Coefficients of Nonaqueous Electrolyte Solutions. Part II. Lithium Perchlorate in the Aprotic Solvents Acetone, Acetonitrile, Dimethoxyethane, and Dimethylcarbonate J. Solution Chem. (submitted)

  • J.Barthel, R.Neueder, and H.Wittmann
    Osmotic Coefficients and Activity Coefficients of Nonaqueous Electrolyte Solutions. Part III. Tetraalkylammonium Bromides in Ethanol and 2-Propanol (in preparation)

  • Barthel,J.; Klein,L.; Kunz,W.; Calmettes,P.; Turq,P., Tetraalkylammonium bromides in methanol: Small angle neutron scattering and vapor pressure measurements, J. Solution Chem., 23, No.Ed 9, 955-971 (1994).

  • Barthel,J.; Neueder,R.; Kunz,W., Osmotic coefficients of non-aqueous electrolyte solutions at thermodynamic and McMillan-Mayer level, Pure Appl. Chem., 65, No.Ed 5 ,889-894 (1993).

  • Barthel,J.; Lauermann,G.; Neueder,R.; in:Meyers,R.A.(ED.), Encyclopedia of Physical Science and Technology. Electrolyte Solutions, Thermodynamics, Academic Press, Orlando, 641-662 (1992).

  • Kunz,W.; Turq,P.; Calmettes,P.; Barthel,J.; Klein,L., n-Tetrapentylammonium bromide in 2-propanol: vapor pressure and small-angle neutron scattering measurements, J. Phys. Chem., 96 , No.Ed 6, 2743-2749 (1992).

  • Kunz,W.; Barthel,J., Vapor pressure measurements on nonaqueous electrolyte solutions. 6. Some remarks on integral equations, J. Solution Chem., 19, No.Ed 4, 339-352 (1990).

  • Barthel,J.; Kunz,W.; Lauermann,G.; Neueder,R., Calculation of osmotic coefficients of nonaqueous electrolyte solutions with the help of Chemical Models, Ber. Bunsenges. Phys. Chem., 92, 1372 1380 (1988).

  • Barthel,J.; Kunz,W., Vapor pressure data for non-aqueous electrolyte solutions. 5. Tetraalkylammonium salts in Acetonitrile, J. Solution Chem., 17, No.Ed 5, 399-415 (1988).

  • Lauermann,G.; Kunz,W.; Barthel,J., Vapor pressure measurements on nonaqueous solutions. IV. HNC calculations using Friedman's cosphere overlap model, J. Solution Chem., 16, No.Ed 11, 871-884 (1987)

  • Barthel,J.; Lauermann,G., Vapor pressure measurements on non-aqueous electrolyte solutions. 3. Solutions of Sodium Iodide in Ethanol, 2-Propanol and Acetonitril, J. Solution Chem., 15, No.Ed 10 ,869-877 (1986).

  • Barthel,J.; Lauermann,G.; Neueder,R., Vapor pressure measurements on non-aqueous electrolyte solutions. 2. Tetraalkylammonium salts in Methanol. Activity coefficients of various 1-1 electrolytes at high concentrations, J. Solution Chem., 15, No.Ed 10, 851-867 (1986).

  • Barthel,J.; Neueder,R.; Lauermann,G., Vapor pressure measurements on nonaqueous solutions. 1. Alkali metal salts in Methanol, J. Solution Chem., 14, No.Ed 9, 621-633 (1985).

  • Barthel,J. ;Neueder,R., Precise apparatus for the determination of the vapour pressure, GIT Fachz. Lab., 28, No.Ed 11, 1002-1012 (1984).

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