Prediction of multicomponent liquid adsorption using excess quantities

Abstract

The utilization of excess quantities as the basis of a thermodynamic approach can simplify the prediction of multicomponent data from binary ones. Whereas in Part II the excess formalism was applied to the prediction of liquid phase adsorption on solids, in this paper, the liquid/air interface is investigated. In order to show the generality of the suggested approach, thermodynamic equations are developed in analogy to Part II. Surface tensions are predicted by different excess models and compared with experimental data. From predicted surface tensions, ternary adsorption isotherms on the liquid/air interface are calculated.

Further advancements in predicting adsorption equilibria using excess formalism: Calculation of adsorption excesses at the liquid/solid interface

“…(6) was successfully applied to the prediction of ternary adsorption excesses and surface tension of several near-ideal and non-ideal ternary liquid mixtures [9,10]; whereas, it was less accurate in the case of strongly non-ideal mixtures [10]. In order to overcome this insufficiency, we propose here an analogical approach to that used in mixture thermodynamics.…”

“…The approach based on the measurable adsorption excess quantities can be applied to the prediction of adsorption excesses at the liquid/solid interface [9] as well as of surface tensions at the liquid/ gas interface [10]. This approach was tested for several ternary adsorption systems.…”

“…The superiority of prediction of adsorption equilibria in terms of excess quantities instead of absolute quantities became obvious [9]. However, for strongly non-ideal systems, especially those containing water, these predictions were unsatisfactory [10].…”

Calculation of immersion enthalpy data from adsorption isotherms

“…the Redlich-Kister polynomial [15] and the Kind function [16]. The parameters of the Bi-Langmuir equation are given in Table 1. A consistency test was carried out for the three binary margins of the ternary Gibbs triangle applying Eq.…”

Surface tension of non-ideal binary and ternary liquid mixtures at various temperatures and p=81.5kPa

“…Also, the models of Fu et al, Wang-Chen and Kalies et al [13] were applied for ternary homogeneous liquid mixtures. It was anticipated that surface tension could be predicted for the ternary system just by using the surface tension of the individual pure components and evaluated binary coefficients.…”