离子液体接枝型PI/GO膜的制备及CO2/N2分离的应用

doi:10.16085/j.issn.1000-6613.2020-0081

化工进展 ›› 2020, Vol. 39 ›› Issue (11): 4550-4556.DOI: 10.16085/j.issn.1000-6613.2020-0081

离子液体接枝型PI/GO膜的制备及CO₂/N₂分离的应用

贝鹏志(), 刘红晶(), 张莹, 高缨佳, 胡爱军, 宾华

沈阳工业大学石油化工学院，辽宁辽阳 111003

出版日期:2020-11-05 发布日期:2020-11-06
通讯作者: 刘红晶
作者简介:贝鹏志（1993—），男，硕士研究生，研究方向为气体分离膜。E-mail：beipengzhi@163.com。
基金资助:
辽宁省教育厅重点攻关项目(LZGD2019004);辽宁百千万人才项目;辽宁省自然科学基金(20170540685)

Preparation of ionic liquid grafted-PI/GO membranes and its application in CO₂/N₂ separation

Pengzhi BEI(), Hongjing LIU(), Ying ZHANG, Yingjia GAO, Aijun HU, Hua BIN

School of Petrochemical Engineering, Shenyang University of Technology, Liaoyang 111003, Liaoning, China

Online:2020-11-05 Published:2020-11-06
Contact: Hongjing LIU

摘要/Abstract

摘要：

为了显著提高聚酰亚胺气体分离膜的气体选择性，本文首先通过含有C $? ????$ N的席夫碱特征结构将胺基化功能性离子液体（[NH₂ebim][PF₆]）以侧基的形式接枝于聚酰亚胺主链，形成了离子液体接枝型聚酰亚胺（IL-GPI），然后再通过共混的方法向其中引入氧化石墨烯（GO），制备出IL-GPI/GO混合基质膜，并应用于CO₂/N₂的分离体系。分别利用傅里叶红外光谱仪（FTIR）、旋转黏度计、扫描电子显微镜（SEM）和动态热机械分析仪（DMA）对IL-GPI/GO混合基质膜进行了表征，并探讨了不同GO含量的IL-GPI/GO混合基质膜对CO₂/N₂气体分离性能的影响。结果表明，GO在IL-GPI/GO混合基质膜中具有较好的分散性，且混合基质膜的刚性有所增强。对不同GO含量的混合基质膜进行分离性能的比较，发现当GO质量分数为0.8%时，CO₂的渗透系数可以提高到16.5Barrer，CO₂/N₂的选择性可提高到176，突破2008年的Robeson上限。

关键词: 膜, 离子液体, 聚酰亚胺, 氧化石墨烯, 选择性

Abstract:

The study aimed to increase the CO₂/N₂ selectivity of gas separation membranes. Aminated task specific ionic liquid, 1-aminoethyl-3-buthylimidazolium hexafluorophosphate ([NH₂ebim][PF₆]), was grafted to polyimide chains as side groups by the structure of Schiff base of C $? ????$ N to form ionic liquid grafted polyimide (IL-GPI), and then graphene oxide (GO) was added into IL-GPI by blending and IL-GPI/GO mixed matrix membranes were fabricated. IL-GPI/GO mixed matrix membranes were characterized by Fourier transform infrared spectroscopy (FTIR), rotatory viscometer, scanning electronic microscopy (SEM) and dynamic thermomechanical analysis (DMA), respectively. The effect of GO concentrations of IL-GPI/GO mixed matrix membranes on gas permeability was studied. The results showed that GO had good dispersion in MMMs and the rigidity of MMMs was enhanced. After a comparison among these mixed matrix membranes with different GO concentrations, CO₂ permeability and CO₂/N₂ selectivity were improved to 16.5Barrer and 176 when GO mass fraction was 0.8%, respectively, which had exceeded 2008 Robeson’s upper bound.

Key words: membrane, ionic liquid, polyimide, graphene oxide, selectivity

中图分类号:

TQ028.8

贝鹏志, 刘红晶, 张莹, 高缨佳, 胡爱军, 宾华. 离子液体接枝型PI/GO膜的制备及CO₂/N₂分离的应用[J]. 化工进展, 2020, 39(11): 4550-4556.

Pengzhi BEI, Hongjing LIU, Ying ZHANG, Yingjia GAO, Aijun HU, Hua BIN. Preparation of ionic liquid grafted-PI/GO membranes and its application in CO₂/N₂ separation[J]. Chemical Industry and Engineering Progress, 2020, 39(11): 4550-4556.

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离子液体接枝型PI/GO膜的制备及CO₂/N₂分离的应用

Preparation of ionic liquid grafted-PI/GO membranes and its application in CO₂/N₂ separation

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