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Comparative study of adsorbents performance in ethylene/ethane separation

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Abstract

Some potential adsorbents for ethylene/ethane separation are ethylene selective while the others are ethane selective. Among different adsorbents, i.e., zeolites and metal organic frameworks (MOFs), a comparative study is critical to find the more suitable adsorbent for the separation. In this paper, binary ethylene/ethane adsorption performances of zeolites and MOFs, i.e., equilibrium selectivities and adsorption capacities are investigated utilizing ideal adsorbed solution theory (IAST). IAST model is applied at different gas compositions (0.1–0.9 ethylene mole fractions) and pressures up to 100 kPa. The results revealed that the most selective adsorbent toward ethylene is 5A zeolite while MOFs have higher equilibrium adsorption capacities. Among zeolites and MOFs, 5A and Fe2(dobdc) have the highest selectivity (27.4 and 13.6) and capacity (≈2.8 and 5.8 mmol ethylene/g) at 100 kPa and 298 K for a 50/50 mixture. Among ethane selective adsorbents, Silicalite-1 zeolite and UTSA-33a (MOF) have the highest selectivity and capacity (≈2.9 and ≈1.5 mmol ethane/g) at 100 kPa and 298 K for a 50/50 mixture, respectively. Investigation showed that adsorption capacity of ethylene selective adsorbents is higher than that of ethane selective ones.

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Abbreviations

A:

Adsorption surface (m2)

b:

Affinity parameter of Langmuir, Toth and Sips isotherms (kPa−1)

n:

Heterogeneity parameter in Sips isotherm (-)

p:

Pressure (kPa)

p0 :

Hypothetical pressure of the pure component (kPa−1)

qsat :

Saturation adsorption capacity of adsorbent (mmol g−1)

q:

Amount adsorbed (mmol g−1)

Rg :

Universal gas constant (J K−1 mol−1)

T:

Temperature (K)

x:

Mole fraction of a pure component at the adsorbed phase (-)

y:

Mole fraction of a pure component at the gas phase (-)

z:

Reduced spreading pressure (mol cm−3)

π:

Spreading pressure (J m−3)

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  1. Chemical Engineering Department and Nanostructure Materials Research Center (NMRC), Sahand University of Technology, P.O. Box: 51335-1996, Tabriz, Iran

    Hafez Maghsoudi

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  1. Hafez Maghsoudi
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Maghsoudi, H. Comparative study of adsorbents performance in ethylene/ethane separation. Adsorption 22, 985–992 (2016). https://doi.org/10.1007/s10450-016-9805-x

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  • DOI: https://doi.org/10.1007/s10450-016-9805-x

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