A nonwoven supported mixed matrix membrane for CH4/N2 separation

doi:10.1016/j.cjche.2024.04.021

中国化学工程学报 ›› 2024, Vol. 73 ›› Issue (9): 101-108.DOI: 10.1016/j.cjche.2024.04.021

A nonwoven supported mixed matrix membrane for CH₄/N₂ separation

Yuntao Liang^1,2, Yongjing Wang^1,2, Wenbin Feng², Jingkai Xu³, Wei Xiao^1,3

1. State Key Laboratory of Coal Mine Disaster Prevention and Control, China Coal Technology and Engineering Group Shenyang Research Institute, Shenfu Demonstration Zone 113122, China;
2. China Coal Research Institute, Beijing 100013, China;
3. School of Petrochemical Engineering, Liaoning Petrochemical University, Fushun 113001, China

收稿日期:2024-01-09 修回日期:2024-04-28 接受日期:2024-04-28 出版日期:2024-11-21 发布日期:2024-05-27
通讯作者: Wei Xiao,E-mail:xiaowei@lnpu.edu.cn
基金资助:
The authors are grateful for financial support from the National Natural Science Foundation of China (52174229 and 52174230), the Natural Science Foundation of Liaoning Province (2022-KF-13-05), Fushun Revitalization Talents Program (FSYC202107010) and the program funded by Liaoning Province Education Administration (LJKZ0411).

A nonwoven supported mixed matrix membrane for CH₄/N₂ separation

Yuntao Liang^1,2, Yongjing Wang^1,2, Wenbin Feng², Jingkai Xu³, Wei Xiao^1,3

1. State Key Laboratory of Coal Mine Disaster Prevention and Control, China Coal Technology and Engineering Group Shenyang Research Institute, Shenfu Demonstration Zone 113122, China;
2. China Coal Research Institute, Beijing 100013, China;
3. School of Petrochemical Engineering, Liaoning Petrochemical University, Fushun 113001, China

Received:2024-01-09 Revised:2024-04-28 Accepted:2024-04-28 Online:2024-11-21 Published:2024-05-27
Contact: Wei Xiao,E-mail:xiaowei@lnpu.edu.cn
Supported by:
The authors are grateful for financial support from the National Natural Science Foundation of China (52174229 and 52174230), the Natural Science Foundation of Liaoning Province (2022-KF-13-05), Fushun Revitalization Talents Program (FSYC202107010) and the program funded by Liaoning Province Education Administration (LJKZ0411).

摘要/Abstract

摘要： Efficiently enriching low-concentration CH₄ is pivotal for enhancing the utilization of unconventional energy sources and mitigating greenhouse gas emissions. This study focuses on modifying the overall performance of CH₄/N₂ separation membranes. A novel mixed matrix membrane (MMM) with a reinforced substrate structure was developed through a straightforward dip-coating technique. This MMM incorporates a polytetrafluoroethylene (PTFE) porous membrane as the supporting framework, while a composite of block polymer (styrene-butadiene-styrene) and metal-organic framework (Ni-MOF-74) forms the selective separation layer. Comprehensive characterization of Ni-MOF-74 and the fabricated membranes was conducted using X-rays diffraction, scanning electron microscope, Brunauer-Emmett-Teller analysis, and gas permeance tests. The findings indicate a robust integration of the PTFE porous support with the membrane layer, enhancing the mechanical stability of the MMM. Under optimal conditions, the mechanical strength of the PM20 membrane (containing 20% Ni-MOF-74) was observed to be 37.7 MPa, representing remarkable increase compared to the non-reinforced MMM. Additionally, the PM20 membrane exhibited an impressive CH₄ permeation rate of 92 barrer (1 barrer = 3.35×10^-16 mol·m·m^-2·s^-1·Pa^-1) alongside a CH₄/N₂ selectivity of 4.18. These results underscore the MMM's substantial performance and its promising potential in methane enrichment applications.

关键词: Mixed matrix membrane, CH₄/N₂ separation, MOF fillers, Porous skeleton

Abstract: Efficiently enriching low-concentration CH₄ is pivotal for enhancing the utilization of unconventional energy sources and mitigating greenhouse gas emissions. This study focuses on modifying the overall performance of CH₄/N₂ separation membranes. A novel mixed matrix membrane (MMM) with a reinforced substrate structure was developed through a straightforward dip-coating technique. This MMM incorporates a polytetrafluoroethylene (PTFE) porous membrane as the supporting framework, while a composite of block polymer (styrene-butadiene-styrene) and metal-organic framework (Ni-MOF-74) forms the selective separation layer. Comprehensive characterization of Ni-MOF-74 and the fabricated membranes was conducted using X-rays diffraction, scanning electron microscope, Brunauer-Emmett-Teller analysis, and gas permeance tests. The findings indicate a robust integration of the PTFE porous support with the membrane layer, enhancing the mechanical stability of the MMM. Under optimal conditions, the mechanical strength of the PM20 membrane (containing 20% Ni-MOF-74) was observed to be 37.7 MPa, representing remarkable increase compared to the non-reinforced MMM. Additionally, the PM20 membrane exhibited an impressive CH₄ permeation rate of 92 barrer (1 barrer = 3.35×10^-16 mol·m·m^-2·s^-1·Pa^-1) alongside a CH₄/N₂ selectivity of 4.18. These results underscore the MMM's substantial performance and its promising potential in methane enrichment applications.

Key words: Mixed matrix membrane, CH₄/N₂ separation, MOF fillers, Porous skeleton

Yuntao Liang, Yongjing Wang, Wenbin Feng, Jingkai Xu, Wei Xiao. A nonwoven supported mixed matrix membrane for CH₄/N₂ separation[J]. 中国化学工程学报, 2024, 73(9): 101-108.

Yuntao Liang, Yongjing Wang, Wenbin Feng, Jingkai Xu, Wei Xiao. A nonwoven supported mixed matrix membrane for CH₄/N₂ separation[J]. Chinese Journal of Chemical Engineering, 2024, 73(9): 101-108.

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A nonwoven supported mixed matrix membrane for CH₄/N₂ separation

A nonwoven supported mixed matrix membrane for CH₄/N₂ separation

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