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Sorbate densities on 5A zeolite above and below the critical conditions: n alkane data evaluation and modeling

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Abstract

The sorbate densities of n-alkanes C1–C20 in 5A zeolite are modeled. For validation of this model, the n-alkane adsorption data for gases and liquids on 5A zeolite is critically evaluated using the concept of sorbate densities. The adsorbed phase critical temperatures appear to occur at a reduced temperature of 0.975 different from the vapor-liquid critical reduced temperatures of 1.0 for C3 to C20 n-alkanes. For methane and ethane species, the critical adsorbate reduced temperatures T CAR occur earlier at reduced temperatures of 0.83 and 0.96 respectively. The modified Rackett equation of Spencer and Danner (1972) is satisfactorily used to calculate the adsorbate loading for q max  below adsorbed phase critical reduced temperature, T CAR.

Above the critical adsorbate reduced temperatures, the saturated loading appears to be constant and equal to 8±1 g/100 gZ for all the alkanes. The data in this region is scarce however, as there are not many isotherms above a T r of 1.15. However the available isotherms appear to have a fairly equal and constant saturation loading between T r=T CAR and T r=1.652.

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  1. Department of Chemical Engineering, American University of Sharjah, PO Box 26666, University City, Sharjah, UAE

    Kevin F. Loughlin & Dana Abouelnasr

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  1. Kevin F. Loughlin
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Correspondence to Kevin F. Loughlin.

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Loughlin, K.F., Abouelnasr, D. Sorbate densities on 5A zeolite above and below the critical conditions: n alkane data evaluation and modeling. Adsorption 15, 521–533 (2009). https://doi.org/10.1007/s10450-009-9202-9

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