Berechnung der adsorptionsisothermen mit einer zustandsgleichung

T. Zeiner, S. Enders

Publikation: Beitrag in Zeitung/MagazinArtikelForschungBegutachtung

Abstract

To study the influence of the actual behavior of the liquid phase on the adsorption properties, three mixtures with different actual behaviors were chosen. The first system hexane/decane is almost an ideal mixture. The second mixture of benzene/methanol has an azeotrope point but no liquid/liquid phase equilibrium (LLE). The third system of hexane/methanol has an azeotrope point and miscibility gap. In the calculation of the adsorption isotherms of the liquid/vapor boundary surface in the hexane/decane system both models give qualitatively similar results. However, the density gradient theory predicts a twice as high value for the adsorption. In the inhomogeneous system hexane/methanol there were characteristic peaks in the adsorption isotherms as a function of the temperature. These related to the concentrations of both coexisting liquid phases and could be traced back to the dissociation equilibrium. For the effectiveness of many industrial processes adsorption plays a decisive role. In the case of homogeneous, almost ideal liquid mixtures the adsorption characteristic of liquid mixtures can be predicted in the liquid/vapor boundary surface with the aid of thermodynamic models and experimentally determined surface tensions. To predict the boundary surface properties expressions from density function theory are suitable. There are still unsolved numerical problems with azeotrope behavior. Numerically simple to handle is the calculation of the Gibbs adsorption isotherm that resides on the assumption of the Gibbs interface. For the description of the real fluid systems the PC-SAFT (Perturbed Chain Statistical Association Fluid Theory) equation of state was used.

Titel in ÜbersetzungCalculation of the adsorption isotherms with an equation of state
Originalsprachedeutsch
Seiten1481-1482
Seitenumfang2
Band79
Nummer9
FachbuchChemie - Ingenieur - Technik
PublikationsstatusVeröffentlicht - Sep 2007

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Adsorption isotherms
Equations of state
Liquids
Hexanes
Hexane
Azeotropes
Methanol
Adsorption
Vapors
Fluids
Benzene
Phase equilibria
Probability density function
Surface properties
Surface tension
Solubility
Thermodynamics

ASJC Scopus subject areas

  • !!Chemical Engineering(all)

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Berechnung der adsorptionsisothermen mit einer zustandsgleichung. / Zeiner, T.; Enders, S.

in: Chemie - Ingenieur - Technik, Jahrgang 79, Nr. 9, 09.2007, S. 1481-1482.

Publikation: Beitrag in Zeitung/MagazinArtikelForschungBegutachtung

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