Pore occupancy changes water/ethanol separation in MOF -Quantitative map of coadsorption by IR
Résumé
The conventional distillation method to separate ethanol from water is energy-intensive and inefficient due to the presence of the azeotropic point of the binary system. Various processes have been proposed as potential separation techniques. Among them, preferential adsorptionbased separation is considered to be an efficient and energy-saving method for purification due to the easy regeneration under relatively mild conditions. In this work, the co-adsorption of gaseous water and ethanol on porous metal-organic framework (MIL-100(Fe)) in various 2 proportions has been studied by coupling FTIR spectroscopy with in-situ gravimetry (AGIR). The quantifications of co-adsorbed water and ethanol on the MIL-100(Fe) have been performed under different conditions (P/P0). Ethanol is preferentially adsorbed on MIL-100(Fe). Vaporliquid equilibrium of water/ethanol was altered when the pore volume of the MIL-100(Fe) was partially occupied. Our results suggest that the optimal conditions for the separation of H2O/EtOH on MIL-100(Fe) is at EtOH(P/Po)<0.05 with H2O(P/Po)<0.4 at room temperature.
Domaines
Chimie
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