Modification of PES/PU membrane by supercritical CO2 to enhance CO2/CH4 selectivity: Fabrication and correlation approach using RSM

doi:10.1016/j.cjche.2017.11.018

摘要/Abstract

摘要： Integrally skinned asymmetric gas separation membranes of polyethersulfone (PES)/polyurethane (PU) blend were prepared using supercritical CO₂ (SC-CO₂) as a nonsolvent for the polymer solution. The membrane consisted of a dense and a porous layer, which were conjoined to separate CO₂ from CH₄. The FTIR, DSC, tensile and SEM tests were performed to study and characterize the membranes. The results revealed that an increase in SC-CO₂ temperature causes an increment in permeance and a decrease in membrane selectivity. Furthermore, by raising the pressure, both permeance and selectivity increased. The modified membrane with SC-CO₂ had much higher selectivity, about 5.5 times superior to the non-modified membrane. This higher selectivity performance compared to previous works was obtained by taking the advantages of both using partial miscible blend polymer due to the strong polar-polar interaction between PU PES and SC-CO₂ to fabricate the membrane. The response surface methodology (RSM) was applied to find the relationships between several explanatory variables and CO₂ and CH₄ permeance and CO₂/CH₄ selectivity as responses. Finally, the results were validated with the experimental data, which the model results were in good agreement with the available experimental data.

关键词: Polyethersulfone, Polyurethane, Membrane, Supercritical CO₂, RSM, Gas separation

Abstract: Integrally skinned asymmetric gas separation membranes of polyethersulfone (PES)/polyurethane (PU) blend were prepared using supercritical CO₂ (SC-CO₂) as a nonsolvent for the polymer solution. The membrane consisted of a dense and a porous layer, which were conjoined to separate CO₂ from CH₄. The FTIR, DSC, tensile and SEM tests were performed to study and characterize the membranes. The results revealed that an increase in SC-CO₂ temperature causes an increment in permeance and a decrease in membrane selectivity. Furthermore, by raising the pressure, both permeance and selectivity increased. The modified membrane with SC-CO₂ had much higher selectivity, about 5.5 times superior to the non-modified membrane. This higher selectivity performance compared to previous works was obtained by taking the advantages of both using partial miscible blend polymer due to the strong polar-polar interaction between PU PES and SC-CO₂ to fabricate the membrane. The response surface methodology (RSM) was applied to find the relationships between several explanatory variables and CO₂ and CH₄ permeance and CO₂/CH₄ selectivity as responses. Finally, the results were validated with the experimental data, which the model results were in good agreement with the available experimental data.

Key words: Polyethersulfone, Polyurethane, Membrane, Supercritical CO₂, RSM, Gas separation

Misagh Ahmadi, Sara Masoumi, Shadi Hassanajili, Feridun Esmaeilzadeh. Modification of PES/PU membrane by supercritical CO₂ to enhance CO₂/CH₄ selectivity: Fabrication and correlation approach using RSM[J]. Chinese Journal of Chemical Engineering, 2018, 26(12): 2503-2515.

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Modification of PES/PU membrane by supercritical CO₂ to enhance CO₂/CH₄ selectivity: Fabrication and correlation approach using RSM

Modification of PES/PU membrane by supercritical CO₂ to enhance CO₂/CH₄ selectivity: Fabrication and correlation approach using RSM

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