Abstract

In this study, a high-performance CO₂ separation membrane was fabricated by compounding amine-based additives with composite polymers composed of polyvinyl alcohol (PVA) and water-absorbing agents. First, the separation performances of several different membranes were compared; through this process, it was found that the performance was improved when sodium polyacrylate (PAANa) was added to the membrane-forming solution. The physical properties of the membranes and their constituent materials, such as water absorbency and heat tolerance, were also evaluated. The membrane prepared by compounding amine-based additives with a composite polymer produced from PVA and PAANa demonstrated the best performance. When the membrane prepared by compounding amine-based additives with the composite polymer was used to separate a CO₂–He mixture (80:20 (v/v)), the CO₂/He selectivity of the membrane exceeded 600 at a total pressure of 0.1 MPa and was approximately 200 at a total pressure of 0.7 MPa at 85 °C.

摘要

在本研究中，高性能 CO ₂分离膜是通过将胺类添加剂与由聚乙烯醇（PVA）和吸水剂组成的复合聚合物复合制成的。首先，比较了几种不同膜的分离性能；通过这个过程，发现在成膜溶液中加入聚丙烯酸钠（PAANa）可以提高性能。还评估了膜及其组成材料的物理性能，例如吸水性和耐热性。通过将胺基添加剂与由 PVA 和 PAANa 生产的复合聚合物混合制备的膜表现出最佳性能。当用胺类添加剂与复合聚合物复合制备的膜用于分离 CO ₂–He 混合物 (80:20 (v/v))，膜的 CO ₂ /He 选择性在 0.1 MPa 的总压力下超过 600，在 85 °C 下在 0.7 MPa 的总压力下约为 200。