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大孔径填料促进Pebax混合基质膜CO2/N2分离

作者：秦丹丹¹，²，王华浩²，胡巧云¹，²，周永哲²，刘红宇¹，代岩²，贺高红²

单位： 1. 沈阳工业大学石油化工学院，辽阳 111003； 2. 大连理工大学盘锦产业技术研究院，辽宁省化学助剂合成与分离重点实验室，盘锦 124221

关键词：金属有机框架；Pebax-1657；混合基质膜；CO2分离；混气测试

DOI号： 10.16159/j.cnki.issn1007-8924.2025.04.012

分类号： TQ028.8

出版年,卷(期):页码： 2025,45(4):113-123

摘要：

为提升Pebax膜的CO2分离性能，通过大孔径结构构建低阻力气体传输通道，借助亲CO2基团确保气体分离的选择性。基于此，选用MIL-96作为填料制备混合基质膜（MMMs）并将其应用于CO2 分离。运用红外光谱（FTIR）、扫描电镜（SEM）、X射线衍射（XRD）等对MIL-96和MMMs进行表征，考察填料添加量、操作温度和混合气等因素对膜气体分离性能的影响。结果表明，MIL-96在Pebax基质中分散良好，提高了对CO2 /N2的分离性能。在纯气与混气测试中，CO2渗透系数和CO2/N2选择性均随着添加量的增加呈现先上升后下降的趋势。在纯气测试条件下，MIL-96的质量分数为15%时性能最佳，CO2渗透系数和CO2/N2选择性分别达到了96.13 Barrer和77.70，相较于纯Pebax膜分别提升了36.96%和49.65%，接近Robeson上限，表明该MIL-96/Pebax MMMs在CO2分离上具有巨大潜能。

In order to improve the CO2 separation performance of Pebax membranes, a low-resistance gas transport channel was constructed through a large pore size structure, and the selectivity of gas separation was ensured by the CO2-philic group. Based on this, MIL-96 was selected as the filler to prepare mixed matrix membranes (MMMs) and applied to CO2 separation. MIL-96 and MMMs were characterized by infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and X-ray diffraction (XRD), etc. The effects of filler additions, operating temperatures and mixed gas on membrane gas separation performance were investigated by tests. The results showed that MIL-96 was well dispersed in Pebax matrix and improved the separation performance of CO2/N2. In both pure gas and mixed gas tests, the CO2 permeability coefficient and CO2/N2 selectivity showed a tendency of increasing and then decreasing with the addition amount. Under the pure gas test conditions, the best performance was achieved at 15% mass fraction of MIL96, and the CO2 permeability coefficient and CO2/N2 selectivity reached 96.13 Barrer and 77.70, respectively, which were 36.96% and 49.65% higher than that of the pure Pebax membranes, and were close to the upper limit of Robeson’s limit, suggesting that this MIL96/Pebax MMMs have great potential for CO2 separation.

基金项目：

辽宁省兴辽英才计划（XLYC2402009）；辽宁省自然科学基金（2023-MS-353）；辽宁省化学助剂合成与分离重点实验室开放课题（ZJKF2304）

作者简介：

秦丹丹（2000-），女，山东济宁人，硕士研究生，主要研究方向为膜分离过程

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