Pressure-resistant polyimide hollow fiber membranes for high-performance helium recovery from natural gas

IF 4.1 2区化学 Q2 POLYMER SCIENCE Polymer Pub Date : 2025-02-14 DOI:10.1016/j.polymer.2025.128164

Zhenyuan Li , Xing Liu , Ying Sun , Lili Gong , Chunfa Liao , Shuangjiang Luo

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Abstract

Industrial gas separation processes demand membranes with superior separation performance under high feed pressures. Herein, we fabricate defect-free hollow fiber membranes (HFMs) using 6FDA-mPDA_0.9-TFMB_0.1 copolyimide, achieving both exceptional pressure resistance and excellent gas separation performance. Through a dry-jet/wet-quench spinning approach, we systematically optimize the microstructure of the HFMs by adjusting the dope composition and spinning conditions. The results reveal that polymer concentration, dope-to-bore fluid ratio, and take-up rate have a significant impact on the pressure resistance of HFMs. Under optimized conditions, the fabricated HFMs exhibit a high burst pressure of 10.5 MPa, along with excellent gas separation performance, including a He permeance of 72.1 GPU and a He/CH₄ selectivity of 178. Additionally, mixed-gas permeation experiments conducted at feed pressures up to 750 PSIA demonstrate excellent resistance to heavy hydrocarbons. These ultra-strong, high-performance HFMs show great potential for efficient helium separation from natural gas under high-pressure conditions.

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工业气体分离过程需要在高进料压力下具有卓越分离性能的膜。在本文中，我们使用 6FDA-mPDA0.9-TFMB0.1 共聚亚胺制造了无缺陷中空纤维膜 (HFM)，实现了优异的耐压性能和卓越的气体分离性能。我们采用干喷射/湿淬火纺丝方法，通过调整涂料成分和纺丝条件，系统地优化了中空纤维膜的微观结构。研究结果表明，聚合物浓度、掺杂剂与孔内流体的比例以及收率对高频膜的耐压性能有显著影响。在优化条件下，制造出的高频膜具有 10.5 兆帕的高爆破压力和优异的气体分离性能，包括 72.1 GPU 的 He 渗透率和 178 的 He/CH4 选择性。此外，在进料压力高达 750 PSIA 的条件下进行的混合气体渗透实验也证明了其对重烃的出色耐受性。这些超强、高性能的 HFM 显示出在高压条件下从天然气中高效分离氦气的巨大潜力。

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来源期刊

Polymer 化学-高分子科学

CiteScore

7.90

自引率

8.70%

发文量

959

审稿时长

32 days

期刊介绍： Polymer is an interdisciplinary journal dedicated to publishing innovative and significant advances in Polymer Physics, Chemistry and Technology. We welcome submissions on polymer hybrids, nanocomposites, characterisation and self-assembly. Polymer also publishes work on the technological application of polymers in energy and optoelectronics. The main scope is covered but not limited to the following core areas: Polymer Materials Nanocomposites and hybrid nanomaterials Polymer blends, films, fibres, networks and porous materials Physical Characterization Characterisation, modelling and simulation* of molecular and materials properties in bulk, solution, and thin films Polymer Engineering Advanced multiscale processing methods Polymer Synthesis, Modification and Self-assembly Including designer polymer architectures, mechanisms and kinetics, and supramolecular polymerization Technological Applications Polymers for energy generation and storage Polymer membranes for separation technology Polymers for opto- and microelectronics.