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<p>The separation of olefins from paraffins, particularly propylene/propane mixtures, is a crucial process in the petrochemical industry. While membrane-based separation offers an energy-efficient alternative to conventional cryogenic distillation, polymeric membranes face challenges such as limited selectivity and plasticization at high feed pressures. This review explores recent advancements in chemical cross-linking strategies aimed at enhancing polymeric membrane performance for olefin/paraffin separation. Various cross-linking approaches—including the incorporation of thermally labile halogens, cyclodextrins, and thermally activated moieties—are analyzed with a focus on their effectiveness in improving plasticization resistance while maintaining gas permeability. The influence of different cross-linking agents, reaction conditions, and polymer structures on membrane performance is systematically reviewed. Particular attention is given to novel cross-linking agents that help mitigate the typical trade-off between plasticization resistance and gas transport properties. Additionally, the relationship between cross-linking density, membrane morphology, and separation efficiency is discussed, along with challenges in scaling up these technologies for industrial applications. This comprehensive analysis provides insights into the current state of cross-linked polymeric membrane development and highlights promising research directions toward achieving more efficient and scalable olefin/paraffin separation.</p>

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Breaking the Trade-off: Cross-Linked Polymeric Membranes for Superior Olefin/Paraffin Separation

  • 期刊论文

  • 发表日期：

    2025年9月6日

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  • Taeheon Kim,
  • Minju Kim,
  • Sujung Kim,
  • Minsoo P. Kim,
  • Wang-Geun Shim,
  • Heseong An

摘要

The separation of olefins from paraffins, particularly propylene/propane mixtures, is a crucial process in the petrochemical industry. While membrane-based separation offers an energy-efficient alternative to conventional cryogenic distillation, polymeric membranes face challenges such as limited selectivity and plasticization at high feed pressures. This review explores recent advancements in chemical cross-linking strategies aimed at enhancing polymeric membrane performance for olefin/paraffin separation. Various cross-linking approaches—including the incorporation of thermally labile halogens, cyclodextrins, and thermally activated moieties—are analyzed with a focus on their effectiveness in improving plasticization resistance while maintaining gas permeability. The influence of different cross-linking agents, reaction conditions, and polymer structures on membrane performance is systematically reviewed. Particular attention is given to novel cross-linking agents that help mitigate the typical trade-off between plasticization resistance and gas transport properties. Additionally, the relationship between cross-linking density, membrane morphology, and separation efficiency is discussed, along with challenges in scaling up these technologies for industrial applications. This comprehensive analysis provides insights into the current state of cross-linked polymeric membrane development and highlights promising research directions toward achieving more efficient and scalable olefin/paraffin separation.