Comparison of Flat and Hollow‐Fiber Mixed‐Matrix Composite Membranes for CO₂ Separation with Temperature

Abstract

Zeolite A/poly (1‐trimethylsilyl‐1‐propyne) (zeoliteA/PTMSP) and [emim][Ac]/chitosan (IL/CS) are mixed‐matrix membrane (MMM) materials with enhanced CO2/N2 permselectivity even at higher temperature. The scalability to asymmetric flat and hollow‐fiber geometry by a simple dip‐coating method was analyzed. The CO2/N2 separation performance was evaluated at different temperatures. The resulting composite membranes exhibit a significantly enhanced CO2 permeation flux because the MMM layer thickness is reduced by 97 % from flat to hollow‐fiber geometries in IL‐CS composite membranes, while the selectivity is maintained similar to the self‐standing membranes, thus proving that compatibility between the membrane component materials leads to a defect‐free composite membrane, regardless the geometry and temperature.

Modeling Permeation through Mixed-Matrix Membranes: A Review

“…Furthermore, we compare predictions of popular permeation models against available experimental and simulation-based permeation data, and discuss the suitability of these models for predicting MMM permeability under typical operating conditions. Thus, much effort has been devoted to the optimization of MMMs synthesis [34,42,[45][46][47][48]; with a number of works even reporting fabrication of defect-free MMMs [37,[49][50][51].Ideally, a mixed-matrix membrane (MMM) consists of a selective inorganic filler phase embedded to continuous polymer matrix [21,35]. In this way, an MMM combines high intrinsic permeability and separation efficiency of advanced molecular sieving materials (e.g., zeolites, carbons, metal-organic frameworks) or nanoscale materials (e.g., carbon nanosheets or nanotubes) with robust processing capabilities and mechanical properties of glassy polymers [23,52].…”

“…Furthermore, we compare predictions of popular permeation models against available experimental and simulation-based permeation data, and discuss the suitability of these models for predicting MMM permeability under typical operating conditions. Thus, much effort has been devoted to the optimization of MMMs synthesis [34,42,[45][46][47][48]; with a number of works even reporting fabrication of defect-free MMMs [37,[49][50][51].…”

Recent Membrane Developments for CO2 Separation and Capture

“…It was found that a higher zeolite 4A loading could improve permeability but suppress CO 2 /N 2 selectivity due to the formation of microscopic voids at the interface of zeolite and polymer matrix [37]. Fernández-Barquín et al utilized the good compatibility between zeolite A and poly(trimethylsilyl)propyne (PTMSP) to prepare a void-free composite membrane [40]. Zeolite A was well mixed with PTMSP and coated on a support material in both flat and hollow-fiber forms.…”

Process simulation and optimization of oxygen enriched combustion using thin polymeric membranes: effect of thickness and temperature dependent physical aging

“…To conclude, all the studies devoted to process simulation of membrane separation as summarized in Table has been confined to adaptation of either constant permeance at varying operating temperatures using gas transport behavior during initial aging time or variable membrane permeance attributed to physical aging at constant operating temperature (308.15 K), which highlights the research gap that limited work has been available that addresses the effect of operating temperature towards physical aging. In actual industrial application, feed gas can be operated within the range 35–55 °C, which are typical operating temperatures encountered in membrane separation since it is much lower than the glass transition temperature of polymeric membrane, which remains it at glassy‐like condition to perform separation based on sorption and diffusion of gas penetrants . Therefore it is anticipated to extend the study of physical aging of thin polymeric membranes to varying operating temperatures so that the physical parameters and operating conditions that are most profitable for membrane operation throughout its lifespan can be optimized.…”