Supercritical CO2 Treatment of Mixed Matrix Membranes Based on Polyimides for Improvement of Their Gas Transport Properties

IF 2 Q4 CHEMISTRY, PHYSICAL Membranes and Membrane Technologies Pub Date : 2024-05-09 DOI:10.1134/s2517751624020070

D. A. Syrtsova, A. Yu. Alentiev, A. Yu. Nikolaev, D. A. Kletnov, D. A. Chistyakova, R. Yu. Nikiforov, V. E. Ryzhikh, N. A. Belov, R. Sabouri, M. Demirci, C. Yildirim, S. B. Tantekin-Ersolmaz

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Abstract

In this work, mixed matrix membranes (MMMs) were obtained based on polyimides synthesized from a mixture of diethyltoluene diamine (DETDA) isomers and BPDA and 6FDA dianhydrides by introducing metal-organic framework compounds ZIF-8 and ZIF-67 in a concentration of up to 20 wt % in chloroform solution. The starting polyimides were synthesized by one-stage high-temperature catalytic polycondensation in a benzoic acid melt. The studied MMMs were treated with sc-CO₂ followed by decompression. The gas transport and gas selective properties of the original and modified membranes were studied. Experimental values of the effective coefficients of permeability and diffusion of gases for He, H₂, O₂, N₂, CO₂, CH₄ were obtained, and the effective solubility coefficients of these gases were calculated. It was found that treatment of the studied MMMs in sc-CO₂ can significantly increase the level of gas permeability of membranes with gas selectivity at the level of initial values, while the achieved effect of changing the permeability of membranes depends on the gas, the nature of the matrix, and the concentration of the introduced particles. It was found that the treatment effect persists over time with a slight decrease in permeability of gases, which remains at a level significantly higher than the initial values. The demonstrated effect of improving gas transport properties when treating MMMs based on polyimide matrices 6FDA-DETDA and BPDA-DETDA in sc-CO₂ can be used for further application of the proposed modification method in order to increase gas transport through MMMs based on other polymers, including highly permeable ones.

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对基于聚酰亚胺的混合基质膜进行超临界二氧化碳处理以改善其气体传输性能

摘要在这项工作中，通过在氯仿溶液中引入浓度高达 20 wt % 的金属有机框架化合物 ZIF-8 和 ZIF-67，获得了基于二乙基甲苯二胺 (DETDA) 异构体与 BPDA 和 6FDA 二酐混合物合成的聚酰亚胺的混合基质膜 (MMM)。起始聚酰亚胺是在苯甲酸熔体中通过单级高温催化缩聚反应合成的。所研究的 MMM 经 sc-CO2 处理后减压。研究了原始膜和改性膜的气体传输和气体选择特性。获得了 He、H2、O2、N2、CO2、CH4 气体有效渗透和扩散系数的实验值，并计算了这些气体的有效溶解度系数。研究发现，在 sc-CO2 中处理所研究的 MMM 可显著提高膜的气体渗透性水平，在初始值水平上具有气体选择性，而改变膜渗透性的效果取决于气体、基质性质和引入颗粒的浓度。研究发现，处理效果会随着时间的推移而持续，气体渗透性会略有下降，但仍明显高于初始值。在 sc-CO2 中处理基于聚酰亚胺基质 6FDA-DETDA 和 BPDA-DETDA 的 MMM 时，所展示的改善气体传输特性的效果可用于进一步应用所提出的改性方法，以增加气体在基于其他聚合物（包括高渗透性聚合物）的 MMM 中的传输。

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来源期刊

Membranes and Membrane Technologies Multiple-

CiteScore

3.10

自引率

31.20%

发文量

期刊介绍： The journal Membranes and Membrane Technologies publishes original research articles and reviews devoted to scientific research and technological advancements in the field of membranes and membrane technologies, including the following main topics:novel membrane materials and creation of highly efficient polymeric and inorganic membranes;hybrid membranes, nanocomposites, and nanostructured membranes;aqueous and nonaqueous filtration processes (micro-, ultra-, and nanofiltration; reverse osmosis);gas separation;electromembrane processes and fuel cells;membrane pervaporation and membrane distillation;membrane catalysis and membrane reactors;water desalination and wastewater treatment;hybrid membrane processes;membrane sensors;membrane extraction and membrane emulsification;mathematical simulation of porous structures and membrane separation processes;membrane characterization;membrane technologies in industry (energy, mineral extraction, pharmaceutics and medicine, chemistry and petroleum chemistry, food industry, and others);membranes and protection of environment (“green chemistry”).The journal has been published in Russian already for several years, English translations of the content used to be integrated in the journal Petroleum Chemistry. This journal is a split off with additional topics.