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In this work, three different approaches to correlation, analysis and prediction of the adsorption equilibria of gaseous mixtures on porous adsorbents are presented. In the first approach, multicomponent isothermal equations are derived from the single component isotherms by simple extensions. The second approach, based on Polanyi potential theory, describes the adsorption equilibria in terms of the generalised Dubinin-Astakhov equation, which is the only one for each adsorbent for any adsorbate at any temperature. Extensions of this equation at high pressure and for polar systems are also described. The third group of theories is based on the application of surface thermodynamics to the adsorbed solution. Here two different models of the adsorbed solution are taken into consideration: the Myers and Prausnitz model which gives the RAS (Real Adsorbed Solution) as well as the IAS (Ideal Adsorbed Solution) theories, and the vacancy solution model (VSM). Both the models use the concept of activity coefficient so as to take into account the non-ideality of adsorbed solution. In order to calculate the activity coefficients, the SPD (Spreading Pressure Dependent) equation is used in the first model. For VSM, the Flory-Huggins equation and two forms of Wilson equation are presented.

Additional information

Authors: MALARA C, JRC Ispra (IT);PIERINI G, JRC Ispra (IT);VIOLA A, Cagliari University (IT)
Bibliographic Reference: EUR 13996 EN (1992) 47 pp., MF, ECU 7.50
Availability: (2)
Record Number: 199210310 / Last updated on: 1994-12-02
Original language: en
Available languages: en
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