Spreading pressure dependent equation for adsorbate phase activity coefficients

Talu, Orhan; Zwiebel, Imre

doi:10.1016/0167-6989(87)90168-1

Cited by 14 publications

(7 citation statements)

References 10 publications

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“…The binary and ternary mixtures of these compounds show large deviations from ideal solution behavior. Talu and Zwiebel (1987) used a spreading pressure dependent activity coefficient model to correlate the data. These data have also been analyzed by Moon and Tien (1988), Valenzuela et al (1988), Karavias and Myers (1992), and Zhou et al (1994).…”

Section: Examplesmentioning

confidence: 99%

Virial Description of Two-Component Adsorption on Homogeneous and Heterogeneous Surfaces

and

LeVan

1997

Ind. Eng. Chem. Res.

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The two-dimensional virial equation of state is used to describe the adsorbed phase on both homogeneous and heterogeneous surfaces. Heterogeneity is modeled by assuming that the adsorbent surface is composed of two patches. The adsorbed phase is assumed to be completely mobile, and the same virial coefficients represent adsorbate−adsorbate interactions on both patches. Experimental data for highly nonideal systems are accurately correlated using the two-patch model. A predictive approach is proposed for deducing the mixture coefficients from pure component parameters. The approach works reasonably well in predicting binary adsorption equilibria for simple systems.

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Section: Examplesmentioning

confidence: 99%

Virial Description of Two-Component Adsorption on Homogeneous and Heterogeneous Surfaces

and

LeVan

1997

Ind. Eng. Chem. Res.

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“…The real adsorbed solution theory (RAST, Costa et al, 1981; Talu and Zwiebel, 1986; and Steffan and Akgerman, 2001) − was proposed to account for the non-ideality during adsorption; the basic equation for the real adsorbed solution model can be written as where ϕ i and γ ι are the fugacity coefficients of component i in the gas and adsorbed phases, respectively, which reflect the non-ideality of the gas and adsorbate phases.…”

Section: Theorymentioning

confidence: 99%

A Thermodynamic Model for Pure and Binary Adsorption Equilibria of N₂ and O₂ on Lithium-Exchanged Low Silicon-to-Aluminum Ratio X Zeolite

et al. 2021

J. Chem. Eng. Data

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To accurately describe the adsorption equilibria of N 2 and O 2 on LiLSX zeolite in the design of air separation by pressure swing adsorption, an applicable model (aNRTL−RAST) was developed. It was based on the real adsorbed solution theory (RAST) in which the activity coefficient was calculated by the nonrandom two-liquid theory (aNRTL). The binary adsorbate− adsorbate interaction parameters of the aNRTL theory were estimated from the pure component isotherms. The aNRTL−RAST model was used to predict the mixed gas equilibrium data under different adsorption conditions and compared with the extended Langmuir (E-L), two-dimensional equation of state (2D-EOS), and ideal adsorbed solution (IAST) models. aNRTL−RAST showed better accuracy than the other models, and the average errors for different adsorption conditions were <5%. Therefore, this model can be used to predict the adsorption equilibrium of mixed gases, avoiding complicated and tedious experiments. This study provides a theoretical basis for the selection of oxygen adsorbents for the separation process design of industrial air separation.

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“…Hence, estimation of activity coefficients of the adsorbed phase using correlations for liquid-vapor equilibrium is not thermodynamically consistent, since it does not take the spreading pressure into account. Hence, Talu and Zwiebel 6,7 proposed the spreading pressure dependant (SPD) model. In this model, activity coefficients are calculated using equations that are adapted from UNIQUAC (UNIversal QUAsi Chemical 8 ) formulation, which estimates the activity coefficients in a liquid phase.…”

Section: Introductionmentioning

confidence: 99%

Modeling of adsorption isotherm of a binary mixture with real adsorbed solution theory and nonrandom two‐liquid model

2010

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in Wiley Online Library (wileyonlinelibrary.com).Gas-phase adsorption equilibria of diluted mixtures of methyl-ethyl-ketone and isopropylanol on activated carbon were investigated. Experimental isotherms were determined by a constant volume method. Single-component adsorption isotherms were fitted by the frequently used Toth model with good accuracy. Then adsorption isotherms were determined for different binary mixtures (with different initial ratio of the two components). Binary mixtures adsorption isotherms were calculated using the adsorbed solution theory. Ideal adsorbed solution theory (IAST) could not represent experimental data, but it was observed that increasing amount of MEK led to higher nonideality of the mixture. Then UNIversal QUAsi Chemical (UNIQUAC) and nonrandom twoliquids (NRTL) models were considered to describe activity coefficients of the adsorbed phase. The fitted parameters of UNIQUAC model depend on the ratio of the two components, whereas the NRTL model is able to fit all experiments with the same parameters, whatever the initial ratio may be.

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Spreading pressure dependent equation for adsorbate phase activity coefficients

Cited by 14 publications

References 10 publications

Virial Description of Two-Component Adsorption on Homogeneous and Heterogeneous Surfaces

Virial Description of Two-Component Adsorption on Homogeneous and Heterogeneous Surfaces

A Thermodynamic Model for Pure and Binary Adsorption Equilibria of N₂ and O₂ on Lithium-Exchanged Low Silicon-to-Aluminum Ratio X Zeolite

Modeling of adsorption isotherm of a binary mixture with real adsorbed solution theory and nonrandom two‐liquid model

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Spreading pressure dependent equation for adsorbate phase activity coefficients

Cited by 14 publications

References 10 publications

Virial Description of Two-Component Adsorption on Homogeneous and Heterogeneous Surfaces

Virial Description of Two-Component Adsorption on Homogeneous and Heterogeneous Surfaces

A Thermodynamic Model for Pure and Binary Adsorption Equilibria of N2 and O2 on Lithium-Exchanged Low Silicon-to-Aluminum Ratio X Zeolite

Modeling of adsorption isotherm of a binary mixture with real adsorbed solution theory and nonrandom two‐liquid model

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A Thermodynamic Model for Pure and Binary Adsorption Equilibria of N₂ and O₂ on Lithium-Exchanged Low Silicon-to-Aluminum Ratio X Zeolite