Abstract The implementation of membrane-based separation for olefin/paraffin mixtures has the potential to significantly reduce energy consumption, but is limited by the lack of suitable membrane materials with desired performance and low cost. Here, mixed matrix membranes (MMMs) fabricated from incorporating ZIF-8 nanocrystals into the poly(vinyl acetate) (PVAc) matrix exhibit significant improvement of propylene/propane permeability and selectivity as well as the operating stability. On the 39 wt% ZIF-8/PVAc MMMs, both the C 3 H 6 permeability and C 3 H 6 /C 3 H 8 selectivity are about 10-fold increase over pure PVAc. The gas transportation mechanism through ZIF-8/PVAc MMMs was also evaluated. The favorable interfacial interaction between the H of the imidazole in the ZIF-8 and ester groups of PVAc enhances the mechanical strength and plasticization resistance of the neat polymer membrane. Therefore, the newly developed composite membrane may have great potential for industrial C 3 H 6 /C 3 H 8 separation.

中文翻译：

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与 ZIF-8 纳米晶体混合的聚（醋酸乙烯酯）膜中增强的 C 3 H 6 /C 3 H 8 分离性能

摘要 对烯烃/石蜡混合物实施膜分离具有显着降低能耗的潜力，但受到缺乏具有所需性能和低成本的合适膜材料的限制。在这里，通过将 ZIF-8 纳米晶体掺入聚醋酸乙烯酯 (PVAc) 基质中制成的混合基质膜 (MMM) 表现出丙烯/丙烷渗透性和选择性以及操作稳定性的显着改善。在 39 wt% ZIF-8/PVAc MMM 上，C 3 H 6 渗透率和 C 3 H 6 /C 3 H 8 选择性均比纯 PVAc 增加了约 10 倍。还评估了通过 ZIF-8/PVAc MMM 的气体传输机制。ZIF-8 中咪唑的 H 与 PVAc 的酯基之间良好的界面相互作用增强了纯聚合物膜的机械强度和抗塑化性。因此，新开发的复合膜在工业C 3 H 6 /C 3 H 8 分离方面具有巨大潜力。