Interfacial tensions of fluid mixtures with polar and associating components

In this paper the gradient theory is applied for modelling the interfacial tensions of planar interfaces in multicomponent systems, in which one or more associating components are present. For this purpose, the square gradient theory is combined with the Associating-Perturbed-Anisotropic-Chain Theor...

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Bibliographic Details
Published in:Fluid phase equilibria 1998-09, Vol.150, p.633-640
Main Authors: Cornelisse, P.M.W., Wijtkamp, M., Peters, C.J., de Swaan Arons, J.
Format: Article
Language:English
Subjects:
Association
Equation of state
Interfacial tension
Liquid–liquid equilibria
Modelling
Vapour–liquid equilibria
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Summary:In this paper the gradient theory is applied for modelling the interfacial tensions of planar interfaces in multicomponent systems, in which one or more associating components are present. For this purpose, the square gradient theory is combined with the Associating-Perturbed-Anisotropic-Chain Theory. The results have been compared with results obtained with the gradient theory combined with the Peng–Robinson equation of state. The interfacial tensions computed from the new model agree very well with experiments for systems composed of normal alcohols and water. Even the interfacial tensions of a ternary system composed of water, hexane, and ethanol can be described accurately. In order to improve the accuracy the influence parameter was a linear function of temperature.
ISSN:0378-3812
1879-0224
DOI:10.1016/S0378-3812(98)00311-2