Abstract
The experimental study in our group has shown that a novel slurry combining advantages of metal-organic frameworks (MOFs) and membranes by suspending zeolitic imidazolate framework-8 (ZIF-8) in ethylene glycol (EG) may separate low-boiling gas mixtures more efficiently compared to conventional technologies. The focus of this work is on constructing a thermodynamic model to describe the absorption-adsorption equilibrium of gas in the slurry of ZIF-8+EG and ZIF-8+H2O. The Patel-Teja equation of state (PT EOS) combined with the Kurihara mixing rule was used to calculate the absorption equilibrium of gas in liquid absorbent. The Langmuir adsorption equation was applied to calculate the gas adsorption in solid ZIF-8. According to the previous experimental study, the liquid absorbent not only disperses solid ZIF-8, but also acts as a semi-permeable membrane which surrounds the solid particle. The difference in permeability of gases further enhances the selectivity of the slurry phase for gas mixture. In this work, the osmotic pressures of gas passing through the liquid membrane on the surface of ZIF-8 were correlated with the equilibrium fugacity of gas component using experimental data. The obtained model was applied to calculate the hydrogen and light-hydrocarbon recovery using the ZIF-8/EG and ZIF-8/H2O slurry. This modeling work may provide some guidance for designing mixture separation process by using this novel technology.
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