ISSN:
0001-1541
Keywords:
Chemistry
;
Chemical Engineering
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Process Engineering, Biotechnology, Nutrition Technology
Notes:
A thermodynamically consistent, multimodel approach for the prediction of mixture adsorption equilibria from pure-component adsorption isotherms is described. The ideal adsorbed solution (IAS) model is employed at low surface coverage, where potential attractive forces tend to govern adsorption behavior. An energetically quasi-homogeneous version of the Langmuir-Freundlich (LF) model is proposed at high coverage, where lateral adsorbate interactions and finite-adsorbent geometric constraints tend to homogenize such attractive forces. The classical LF model is used for intermediate coverage, where both energetic attractive and geometric constraining forces contribute significantly to mixed-gas adsorption behavior. A major benefit of this three-regime modeling method is that physically realistic adsorptive selectivities can be adhered to at both extremes of coverage, a property not generally shared by either the IAS or LF models taken singly. This three-regime approach yields better multicomponent equilibria predictions than IAS-only modeling approaches for many relatively nonideal adsorption systems.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/aic.690430212
