Abstract
Three different zeolite nanocrystals (SAPO-34, PS-MFI and ETS-10) were incorporated into the polymer matrix (Matrimid® 5218) as polymer precursors, with the aim of fabricating mixed-matrix carbon molecular sieve membranes (CMSMs). These membranes are investigated for their potential for air separation process. Based on our gas permeation results, incorporating porous materials is feasible to improve O2 permeability, owing to the creation of additional porosities in the resulting mixed-matrix CMSMs. Owing to this, the performance of the CMSM with 30 wt% PS-MFI loading is able to surpass the upper bound limit. This study demonstrates the feasibility of zeolite nanocrystals in improving O2/N2 separation performance in CMSMs.
Highlights
Air, which mainly consists of oxygen (O2) and nitrogen (N2), is an important element for various industries and chemical processes
It can be observed that the addition of zeolite nanocrystals is feasible to elevate O2 permeability due to the presence of large micropore volumes on zeolite nanocrystals
Performance Benchmarking with Filler Enhancement Index (Findex) and Robeson Upper Bound The performance of mixed-matrix carbon molecular sieve membranes (CMSMs) in this study was benchmarked with the
Summary
Air, which mainly consists of oxygen (O2) and nitrogen (N2), is an important element for various industries and chemical processes. In industrial processes, the production of high-purity (>99.5 vol%) oxygen and nitrogen from air can be achieved by cryogenic distillation or pressure swing adsorption (PSA) These technologies have been present for at least 70 years with a daily production volume of 100 tonnes, high capital cost and large energy penalty challenge the need to consider an alternative process for air separation [7,8]. This attracted substantial research interest towards membrane-based separation. Membrane-based high-purity oxygen production is limited to only 25 tonnes per day [9,10], but its practical feasibility due to its simplicity in its operation, cost effectiveness and small plant footprint are competitive advantages over cryogenic distillation and PSA
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