Accession Number : ADA325822

Title :   Theoretical Aspects of Multicomponent Adsorption Equilibria. Part II: Limitations in the Application of the Adsorbed Solution Theory.

Descriptive Note : Final rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC ENVIRONMENTAL SENSOR CHEMISTRY SECTION

Personal Author(s) : Matusko, Richard A. ; Lamontagne, Robert A.

PDF Url : ADA325822

Report Date : 30 MAY 1997

Pagination or Media Count : 14

Abstract : Theoretical aspects of multicomponent adsorption equilibria are investigated with a focus on the thermodynamically based Adsorbed Solution Theory (AST). A previously published NRL Memorandum Report 6116-97.7946 detailed the development of a computationally fast, heterogeneous, binary adsorption relation using the Langmuir isotherm with the Ideal AST (IAST) as the local, single component and mixture adsorption models. This report outlines the limitations in the AST when applied to systems which contain components demonstrating unfavorable adsorption isotherms. Investigation of organic/water mixture data on activated carbon produces erroneous excess areas of mixing as calculated by the AST. Theoretical studies involving both the Freundlich and constant separation factor isotherms reinforce the calculations from the organic/water mixture AST work-up. The combination of these results indicate that care should be taken when applying the AST to systems that contain one or more unfavorably adsorbed components.

Descriptors :   *ADSORPTION, *ADSORBENTS, *ADSORBATES, SOLUTIONS(MIXTURES), THERMODYNAMICS, WATER, EQUILIBRIUM(GENERAL), ACTIVATED CARBON, ISOTHERMS.

Subject Categories : Miscellaneous Materials
      Numerical Mathematics
      Industrial Chemistry and Chemical Processing

Distribution Statement : APPROVED FOR PUBLIC RELEASE