Abstract The R410A refrigerant blend (GWP = 2088), a near azeotropic and equimass mixture of difluoromethane (R32, GWP = 675) and pentafluoroethane (R125, GWP = 3500), has been included in the HFC phase down road map established worldwide. In this context, the recovery of value-added R32 from R410A using membrane technology would be a breakthrough in the refrigeration and air conditioning sector, given that conventional distillation cannot be applied to this separation. For the first time, this work has taken advantage of the combination of ionic liquids and polymeric membranes for the separation of the constituents of the R410A mixture. Results show a remarkable improvement in terms of R32 permeability and R32/R125 selectivity in the composite membranes containing 40 wt % [C2mim][SCN] (αR32/R125 up to 14.5) and [C2mim][BF4] (αR32/R125 up to 11.0) with respect to the neat polymer membranes (αR32/R125 up to 6.9). Besides, the long-term stability was successfully tested for 25 days under high pressure conditions (7 and 12 bar), which makes these composite membranes excellent candidates for the development of membrane-based R32 separation and recovery processes.

中文翻译：

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从制冷剂混合物 R410A 中回收二氟甲烷 (R32) 的 pebax 离子液体膜的进料压力和长期分离性能的影响

摘要 R410A 制冷剂混合物 (GWP = 2088) 是二氟甲烷 (R32, GWP = 675) 和五氟乙烷 (R125, GWP = 3500) 的近共沸和等质量混合物，已包含在全球制定的 HFC 逐步下降路线图中。在此背景下，使用膜技术从 R410A 中回收增值 R32 将是制冷和空调领域的一个突破，因为传统蒸馏无法应用于这种分离。这项工作首次利用离子液体和聚合物膜的组合来分离 R410A 混合物的成分。结果表明，在含有 40 wt% [C2mim][SCN]（αR32/R125 高达 14.5）和 [C2mim][BF4]（αR32/R125 高达 14.5）的复合膜中，R32 渗透率和 R32/R125 选择性显着提高。 11. 0) 相对于纯聚合物膜 (αR32/R125 高达 6.9)。此外，在高压条件（7 和 12 巴）下成功测试了 25 天的长期稳定性，这使得这些复合膜成为开发基于膜的 R32 分离和回收工艺的理想选择。