A mixed matrix membrane for enhanced CO2/N2 separation via aligning hierarchical porous zeolite with a polyethersulfone based comb-like polymer,Journal of the Taiwan Institute of Chemical Engineers

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A mixed matrix membrane for enhanced CO2/N2 separation via aligning hierarchical porous zeolite with a polyethersulfone based comb-like polymer
Journal of the Taiwan Institute of Chemical Engineers ( IF 5.5 ) Pub Date : 2021-11-12 , DOI: 10.1016/j.jtice.2021.10.032
Yunfei Yu ₁ , Chenchen Zhang ₁ , Jiufeng Fan ₂ , Dongxia Liu ₂ , Jianqiang Meng ₁

Affiliation

Background

Mixed matrix membranes (MMM)s for CO₂/N₂ separation still suffer from interfacial defects.

Method

To address this, a series of MMMs were prepared using polyethersulfone-g-poly (ethylene glycol) (PES-g-PEG) comb-like copolymer to tune the interfacial interaction with a pillared MFI (PMFI) zeolite nanosheets, which has a hierarchical porous structure to improve permeance. The composite membranes were examined by SEM, EDX and XRD. The dependence of gas permeabilities, diffusion and solubility coefficients of CO₂ and N₂ were determined by the time-lag method.

Results

The increase in PMFI zeolite loading led to an increase in the permeability coefficient of CO_2, which is mainly caused by the increase in CO₂ diffusion coefficient. The CO₂/N₂ gas separation was optimized at a loading of 20wt% PMFI zeolite, which produces a composite membrane with a CO₂ permeability of 66.9 Barrer and an ideal permeability selectivity coefficient of 9.6.

中文翻译：

一种混合基质膜，通过将分级多孔沸石与聚醚砜基梳状聚合物对齐，增强 CO2/N2 分离

背景

_{用于CO 2} /N ₂分离的混合基质膜（MMM）仍然存在界面缺陷。

方法

为了解决这个问题，使用聚醚砜-g-聚（乙二醇）（PES-g-PEG）梳状共聚物制备了一系列 MMM，以调节与柱状 MFI（PMFI）沸石纳米片的界面相互作用，该纳米片具有分层多孔结构以提高渗透性。通过SEM、EDX和XRD检查复合膜。_{CO 2}和N ₂的气体渗透率、扩散系数和溶解度系数的相关性采用时滞法确定。