以新型聚醚酰亚胺为制膜材料,采用PEI/NMP/GBL/THF/EtOH铸膜液,以干-湿法纺丝工艺制备高通量与高分离性能中空纤维气体分离膜.铸膜液中加入γ-丁内酯(GBL)调节膜支撑层结构,通过改变空气间隙高度调控中空纤维膜分离层结构与分离性能.随着空气间隙高度的增加,中空纤维气体分离膜的致密皮层厚度增加,缺陷孔径降低,导致膜的渗透性降低,选择性升高.用硅橡胶涂层后,得到性能稳定的高分离性能中空纤维气体分离膜.通过改进的Henis阻力复合膜模型和气体通过非对称膜的传递机理对膜的致密层结构参数进行了分析.结果表明,空气间隙高度和干燥前的溶剂交换过程对中空纤维膜的分离性能和结构参数具有显著影响.
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