Superior He/CH4 separation properties of crosslinked thermally rearranged membranes obtained by direct fluorination strategy

IF 8.4 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science Pub Date : 2025-05-16 DOI:10.1016/j.memsci.2025.124230

Xuepeng Li , Chulong Chen , Luxin Sun , Congcong Wu , Aqib Riaz , Zelong Xu , Kai Song , Xiaohua Ma

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Abstract

Recovering of helium (He) from natural gas is a practical approach, but the key challenge lies in developing of membrane materials that simultaneously offer high He permeability and excellent He/CH₄ selectivity. In this work, we directly fluorinated a crosslinked thermally rearranged (FCTR) polymer membrane. The resulting FCTR membranes exhibited outstanding He/CH₄ separation performance. Particularly, the fluorinated layer of FCTR-60 achieved a high He permeability of 435 Barrer and an exceptional He/CH₄ selectivity of 7103, surpassing most reported polymer membranes and exceeding latest the perfluoropolymer upper bound. Owing to fluorine substitution and the introduction of a crosslinked structure, the membrane exhibited excellent stability and resistance to aging. The high He permeability can be attributed to the inherent microporosity of the CTR membrane, while the exceptional He/CH₄ selectivity arised from the fluorination-induced restriction of CH₄ diffusion. This work provides a broad prospect for membrane-based He recovery applications.

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通过直接氟化策略获得交联热重排膜优越的He/CH4分离性能

从天然气中回收氦（He）是一种可行的方法，但关键的挑战在于开发同时具有高He渗透率和优异He/CH4选择性的膜材料。在这项工作中，我们直接氟化了一个交联热重排（FCTR）聚合物膜。制备的FCTR膜具有良好的He/CH4分离性能。特别是，氟化层的fcr -60实现了435 Barrer的高He渗透率和7103的He/CH4选择性，超过了大多数报道的聚合物膜，并超过了最新的全氟聚合物上限。由于氟取代和交联结构的引入，膜具有优异的稳定性和耐老化性。高He渗透率可归因于CTR膜固有的微孔性，而异常的He/CH4选择性源于氟化诱导的CH4扩散限制。这项工作为膜基He回收应用提供了广阔的前景。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Membrane Science 工程技术-高分子科学

CiteScore

17.10

自引率

17.90%

发文量

1031

审稿时长

2.5 months

期刊介绍： The Journal of Membrane Science is a publication that focuses on membrane systems and is aimed at academic and industrial chemists, chemical engineers, materials scientists, and membranologists. It publishes original research and reviews on various aspects of membrane transport, membrane formation/structure, fouling, module/process design, and processes/applications. The journal primarily focuses on the structure, function, and performance of non-biological membranes but also includes papers that relate to biological membranes. The Journal of Membrane Science publishes Full Text Papers, State-of-the-Art Reviews, Letters to the Editor, and Perspectives.