Bioethanol has achieved increasing attention in alleviating energy crisis and environmental issues. Pervaporation could be a promising technology to separate ethanol from fermentation. Traditionally, the liquid polymetric solution was compounded on solid porous supports to form composite membranes. Through this liquid-solid interface, it is challenging to precisely control the structure and achieve high pervaporation performance. In this work, we aimed to overcome some of these limitations and designed a polyether block amide (PEBA) pervaporation membrane by dropping the membrane solution on a water surface. While the membrane solution spreading, solvent-water exchange and solvent evaporation occurred. Thereafter the polymer precipitation was induced in the solvent-water interface. The defect-free and uniform selective layer with a thickness of 3.9 μm was achieved by optimizing the ratio of solvent, and the temperature of the water. The PEBA layer was deposited onto porous polytetrafluoroethylene (PTFE) substrate for recovering ethanol from water by pervaporation. The membrane represented a total flux and separation factor of 3.9 kg m⁻² h⁻¹ and 4.9, which was maintained stable for 100 h. The interface-induced membrane demonstrated high separation performance and membrane stability.

生物乙醇在缓解能源危机和环境问题方面受到越来越多的关注。渗透蒸发可能是一种很有前途的技术，可以从发酵中分离乙醇。传统上，液体聚合物溶液复合在固体多孔载体上以形成复合膜。通过这种液固界面，精确控制结构并实现高渗透蒸发性能具有挑战性。在这项工作中，我们旨在克服其中一些限制，并通过将膜溶液滴在水面上来设计聚醚嵌段酰胺 (PEBA) 渗透蒸发膜。在膜溶液扩散的同时，发生溶剂-水交换和溶剂蒸发。此后在溶剂-水界面中诱导聚合物沉淀。厚度为3的无缺陷且均匀的选择层。通过优化溶剂的比​​例和水的温度实现了 9 μm。将 PEBA 层沉积到多孔聚四氟乙烯 (PTFE) 基材上，以通过全蒸发从水中回收乙醇。该膜的总通量和分离系数为 3.9 kg m^-2  h ^-1和 4.9，保持稳定 100 小时。界面诱导膜表现出高分离性能和膜稳定性。