{"title":"De-carboxylation of cross-linkable triptycene-based polyimides for CO2 separation","authors":"Xiaoyu Wang, Fangxu Fan, Yongchao Sun, Jingfa Zhang, Canghai Ma, Gaohong He","doi":"10.1002/aic.18471","DOIUrl":null,"url":null,"abstract":"<p>Polymer-based membrane technology holds immense promise for CO<sub>2</sub> separation. However, it faces persistent challenges, including the high CO<sub>2</sub> pressure-induced plasticization and permeability-selectivity trade-offs, which significantly hinder the development of polymeric membranes. To tackle this issue, we synthesized a novel polyimide 6FDA-DAT:DABA(6FDD) containing triptycene and carboxylic groups. Upon de-carboxylation induced cross-linking, the membrane demonstrated a simultaneous enhancement of gas permeability and selectivity. Specifically, compared to the uncross-linked 6FDD, the 400°C-24 h cross-linked membrane exhibited a remarkable increase in CO<sub>2</sub> permeability by 177% (93.1 Barrer) and a significant rise in CO<sub>2</sub>/CH<sub>4</sub> selectivity by 47% (57.5), reaching the CO<sub>2</sub>/CH<sub>4</sub> upper bound. More importantly, the cross-linked membrane displayed vastly improved CO<sub>2</sub> plasticization resistance, withstanding up to 42 bar of CO<sub>2</sub> feed pressure. The design of decarboxylated cross-linked membranes in this work paves the way for creating high-performing and plasticization-resistant membranes with potential applications in high-pressure CO<sub>2</sub> separations.</p>","PeriodicalId":120,"journal":{"name":"AIChE Journal","volume":null,"pages":null},"PeriodicalIF":3.5000,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"AIChE Journal","FirstCategoryId":"5","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/aic.18471","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Polymer-based membrane technology holds immense promise for CO2 separation. However, it faces persistent challenges, including the high CO2 pressure-induced plasticization and permeability-selectivity trade-offs, which significantly hinder the development of polymeric membranes. To tackle this issue, we synthesized a novel polyimide 6FDA-DAT:DABA(6FDD) containing triptycene and carboxylic groups. Upon de-carboxylation induced cross-linking, the membrane demonstrated a simultaneous enhancement of gas permeability and selectivity. Specifically, compared to the uncross-linked 6FDD, the 400°C-24 h cross-linked membrane exhibited a remarkable increase in CO2 permeability by 177% (93.1 Barrer) and a significant rise in CO2/CH4 selectivity by 47% (57.5), reaching the CO2/CH4 upper bound. More importantly, the cross-linked membrane displayed vastly improved CO2 plasticization resistance, withstanding up to 42 bar of CO2 feed pressure. The design of decarboxylated cross-linked membranes in this work paves the way for creating high-performing and plasticization-resistant membranes with potential applications in high-pressure CO2 separations.
期刊介绍:
The AIChE Journal is the premier research monthly in chemical engineering and related fields. This peer-reviewed and broad-based journal reports on the most important and latest technological advances in core areas of chemical engineering as well as in other relevant engineering disciplines. To keep abreast with the progressive outlook of the profession, the Journal has been expanding the scope of its editorial contents to include such fast developing areas as biotechnology, electrochemical engineering, and environmental engineering.
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Soft Materials: Synthesis, Processing and Products
Thermodynamics and Molecular-Scale Phenomena
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