On the applicability of the theory of ideal adsorption solutions to equilibria in the N2-O2-zeolite NaX system

Kheifets, Leeka; Predtechenskaya, D. M.

doi:10.1134/s0036024406020130

Cited by 1 publication

(2 citation statements)

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“…By definition, when the adsorbed phase is in equilibrium with the gas phase, there is no net mass transfer between the phases. The equilibrium loadings (q i,eq ) for components present in the mixture are computed using the Ideal Adsorption Solution Theory (IAST) [35,36,37]. IAST makes use of pure component isotherms to estimate the equilibrium loading of each component in a mixture.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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Prediction of adsorption isotherms from breakthrough curves

Poursaeidesfahani

Andrés-García

Lange

et al. 2019

Microporous and Mesoporous Materials

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A mathematical model is used to predict adsorption isotherms from experimentally measured breakthrough curves. Using this approach, by performing only breakthrough experiments for a mixture of two (or more) components, one can obtain pure component adsorption isotherms up to the pressure of the experiment. As a case study, the adsorption of an equimolar mixture of CO 2 and CH 4 in zeolite ITQ-29 is investigated. Pure component linear adsorption isotherms for CO 2 and CH 4 are predicted by fitting the theoretical breakthrough curves to the experimental ones. Henry coefficients obtained from our approach are in excellent agreement with those measured experimentally. A similar procedure is applied to predict the complete Langmuir adsorption isotherm from breakthrough curves at high pressures. The resulting adsorption isotherms are in very good agreement with those measured experimentally. In our model for transient adsorption, mass transfer from the gas phase to the adsorbed phase is considered using the Linear Driving Force model and dispersion of the gas phase in the packed bed is taken into account. IAST is used to compute the equilibrium loadings for a mixture of gases. The influence of the dispersion coefficient and the effective mass transfer coefficient on the shape of breakthrough curves is investigated and discussed. Rough estimations of these values are sufficient to predict adsorption isotherms from breakthrough curves.

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Section: Accepted Manuscriptmentioning

confidence: 99%

“…This is not the case for the system under study. For more information about IAST, readers are referred to the original publications [35,36,37,40]. Assuming ideal gas behaviour for the gas phase, the material balance for each component in the gas phase is described by [33,41] 1 RT…”

Section: Accepted Manuscriptmentioning

confidence: 99%