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http://dx.doi.org/10.14579/MEMBRANE_JOURNAL.2018.28.5.351

Elucidation of the Mechanism of Propylene/Propane Separation through Faujasite Zeolite Membrane  

Min, Hae-Hyun (Department of Energy Science and Technology, Graduate School of Energy Science and Technology (GEST), Chungnam National University)
Park, You-In (Center for Convergent Chemical Process, National Research Council of Science & Technology)
Chang, Jong-San (Center for Convergent Chemical Process, National Research Council of Science & Technology)
Park, Yong-Ki (Center for Convergent Chemical Process, National Research Council of Science & Technology)
Cho, Churl-Hee (Department of Energy Science and Technology, Graduate School of Energy Science and Technology (GEST), Chungnam National University)
Publication Information
Membrane Journal / v.28, no.5, 2018 , pp. 351-360 More about this Journal
Abstract
In this study, propylene/propane separation mechanism through NaY zeolite membrane was investigated. As permeation temperature increased, both propylene and propane permeances increased, saturated and decreased again, and a maximum selectivity was shown at around 50 to $60^{\circ}C$. Propane permeance in mixed gas experiment was much smaller than that in single gas experiment, and propylene/propane mixed gas selectivity was much larger than single gas permselectivity. As permeation time increased in transient permeation experiment, propylene permeance initially increased and saturated, while propane permeance decreased and saturated. All the experimental results announced that propylene/propane separation through NaY zeolite membrane was from preferentially adsorbed propylene molecules. The adsorbed propylene molecules efficiently prevented propane molecules from permeating through the membrane, and sufae diffused through the membrane. NaY zeolite capillary membrane prepared in the present study showed a high mixed gas selectivity of 12 and high propylene permeance of 497 GPU for a propylene/propane (89 : 11) mixture at $50^{\circ}C$ and 4 bar. Therefore, it was concluded that NaY zeolite membrane is one of promising membrane materials for propylene/propane separation due to the low cost and high separation performance.
Keywords
NaY zeolite membrane; propylene/propane separation; preferential adsorption; surface diffusion;
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