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<p>The membrane-based separation of propylene/propane represents a promising breakthrough, with the potential to reshape this energy-intensive chemical process. Zeolitic imidazolate framework-8 (ZIF-8) membranes stand out among the various material candidates due to their superior performance. However, advancing ZIF-8 membranes from laboratory-scale demonstrations to industrial deployment requires breakthroughs in scalable, defect-free preparation, challenges that conventional methods have yet to overcome. Here we present a micro-space transformation process (MSTP) that enables controlled nucleation and crystallization by decoupling the direct collision between zinc ions and ligands. This approach allows the sealed inner cavities of tubular supports to serve as reaction spaces to scalably fabricate heterostructured ZIF-8 membranes with an industrially relevant area of 200 cm<sup>2</sup>. We demonstrate the batch preparation of 234 membranes (totaling &gt;4.6 m<sup>2</sup>), which were assembled into membrane modules with attractive performance and long-term stability toward industrial feed gases. We also take a critical step toward industrial implementation by developing a side-stream separation unit and demonstrating membrane integration applications, thereby establishing an energy-efficient pathway for practical membrane-based olefin purification.</p><p></p>

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Scalable large-area ZIF-8 membranes for industrial propylene/propane separations

  • 期刊论文

  • 发表日期：

    2026年4月7日

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  • Haiqian Lian,
  • Jingxian Hua,
  • Qian Wang,
  • Eryue Song,
  • Yawei Gu,
  • Yichang Pan,
  • Weihong Xing

摘要

The membrane-based separation of propylene/propane represents a promising breakthrough, with the potential to reshape this energy-intensive chemical process. Zeolitic imidazolate framework-8 (ZIF-8) membranes stand out among the various material candidates due to their superior performance. However, advancing ZIF-8 membranes from laboratory-scale demonstrations to industrial deployment requires breakthroughs in scalable, defect-free preparation, challenges that conventional methods have yet to overcome. Here we present a micro-space transformation process (MSTP) that enables controlled nucleation and crystallization by decoupling the direct collision between zinc ions and ligands. This approach allows the sealed inner cavities of tubular supports to serve as reaction spaces to scalably fabricate heterostructured ZIF-8 membranes with an industrially relevant area of 200 cm2. We demonstrate the batch preparation of 234 membranes (totaling >4.6 m2), which were assembled into membrane modules with attractive performance and long-term stability toward industrial feed gases. We also take a critical step toward industrial implementation by developing a side-stream separation unit and demonstrating membrane integration applications, thereby establishing an energy-efficient pathway for practical membrane-based olefin purification.