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Highly Selective Benzimidazole-Based Polyimide/Ionic Polyimide Membranes for Pure- and Mixed-Gas CO2/CH4 Separation
Xie, Wei1,2; Jiao, Yang1; Cai, Zhili1; Liu, Hongyan1; Gong, Lili1; Lai, Wei1; Shan, Linglong1; Luo, Shuangjiang1,3
2022-02-01
Source PublicationSEPARATION AND PURIFICATION TECHNOLOGY
ISSN1383-5866
Volume282Pages:9
AbstractThis paper reports two new series of benzimidazole functionalized polyimides and ionic polyimides for highly selective membranes with great potential for natural gas sweetening. It has been demonstrated that both the -NH groups in the benzimidazole moieties and the corresponding ionic groups after N-quaternization tighten the microporous structure and restrict polymer chain mobility through hydrogen bonding and electrostatic interaction. The BET surface areas and d-spacing values decrease with benzimidazole molar content or the degree of ionization. Consequently, a linear correlation between CO2 permeability coefficients with benzimidazole molar content or degree of ionization was observed due to the decrease of CO2 diffusivity, and the monotonic increase of CO2/CH4 selectivities is ascribed to the increase of both diffusivity selectivity and solubility selectivity. The benzimidazole-based copolyimide and the ionic copolyimide membranes exhibited high CO2/CH4 selectivity under high-pressure mixed-gas conditions. In particular, the copolyimide PI-0.75 membrane displayed a mixed gas CO2 permeability of 27 Barrer and CO2/CH4 selectivity of 47 at 20 bar total pressure. The performance was much higher than those of the state-of-the-art commercial cellulose triacetate membranes for natural gas upgrading. The facile polymer synthesis and microporosity tunability, as well as the excellent mixed-gas separation performance, render the copolyimide membranes in this study promising towards economic membrane mediated natural gas upgrading.
KeywordPolyimides Ionic polyimides Hydrogen bonding Mixed-gas permeation Nature gas sweetening
DOI10.1016/j.seppur.2021.120091
Language英语
WOS KeywordHOLLOW-FIBER MEMBRANES ; TRANSPORT PROPERTIES ; CROSS-LINKING ; PERMEATION PROPERTIES ; PLASTICIZATION ; POLYMERS ; PERMEABILITY
Funding ProjectNational Natural Science Foundation of China[22008243] ; National Natural Science Foundation of China[22090063] ; Dalian National Laboratory for Clean Energy (DNL) Cooperation Fund of CAS[DNL201917] ; Beijing Nova Program of Science and Technology[Z191100001119107] ; International Partner Program of CAS[122111KYSB20200035] ; International Partner Program of CAS[122111KYSB20190060] ; Project of Stable Support for Youth Team in Basic Research Field, CAS[YSBR-017]
WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
Funding OrganizationNational Natural Science Foundation of China ; Dalian National Laboratory for Clean Energy (DNL) Cooperation Fund of CAS ; Beijing Nova Program of Science and Technology ; International Partner Program of CAS ; Project of Stable Support for Youth Team in Basic Research Field, CAS
WOS IDWOS:000720836500007
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/51068
Collection中国科学院过程工程研究所
Corresponding AuthorLuo, Shuangjiang
Affiliation1.Chinese Acad Sci, Inst Proc Engn, CAS Key Lab Green Proc & Engn, Beijing Key Lab Ion Liquids Clean Proc,State Key, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Dalian Natl Lab Clean Energy, Dalian 116023, Peoples R China
Recommended Citation
GB/T 7714
Xie, Wei,Jiao, Yang,Cai, Zhili,et al. Highly Selective Benzimidazole-Based Polyimide/Ionic Polyimide Membranes for Pure- and Mixed-Gas CO2/CH4 Separation[J]. SEPARATION AND PURIFICATION TECHNOLOGY,2022,282:9.
APA Xie, Wei.,Jiao, Yang.,Cai, Zhili.,Liu, Hongyan.,Gong, Lili.,...&Luo, Shuangjiang.(2022).Highly Selective Benzimidazole-Based Polyimide/Ionic Polyimide Membranes for Pure- and Mixed-Gas CO2/CH4 Separation.SEPARATION AND PURIFICATION TECHNOLOGY,282,9.
MLA Xie, Wei,et al."Highly Selective Benzimidazole-Based Polyimide/Ionic Polyimide Membranes for Pure- and Mixed-Gas CO2/CH4 Separation".SEPARATION AND PURIFICATION TECHNOLOGY 282(2022):9.
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