Effects of solvent and polymer concentration on the performance of PEI composite membranes

摘要：

Polyetherimide (PEI) gas separation membranes were prepared by the dry-wet phase inversion method. The effects of polymer concentration and the type of solvent on the membrane structure and gas permeation properties were investigated. The results indicated that the increase of polymer concentration in the casting solution resulted in a denser skin layer that intended to promote H2/N2 and O2/N2 selectivity but less permeability of PEI composite membranes for gas separation process. The membrane prepared from DMAc as a solvent exhibited a higher permeability but lower gas selectivity comparing with the membrane prepared with NMP. Scanning electron microscopy (SEM) cross-sectional images showed that the membrane prepared with NMP as a solvent exhibited a tear-like structure and the membrane prepared with DMAc as a solvent exhibited a channel-like structure, respectively. The dipping coating method was used to seal defects on the surface of membrane by dilute silicone. The PEI composite membrane exhibited H2 permeability of 8.5 GPU (1 GPU=1 × 10 -6 cm 3 (STP)/(cm 2 ·s·cmHg)), with a H2/N2 and O2/N2 selectivity of 94.68 and 4.83, respectively, presenting high performance of the membrane.

关键词： PEI NMP DMAc Gas separation

作者: Lingling Zhang Gaohong He Lin Peng Wei Zhao Ming Tan Xuefeng Su

作者单位: State Key Laboratory of Fine Chemicals, R&D Center of Membrane Science and Technology, Dalian Univer State Key Laboratory of Fine Chemicals, R&D Center of Membrane Science and Technology, Dalian Univer

会议类型: 国际会议

会议名称: The 5th International Conference on Separation Science and Technology(第五届国际分离科学与技术会议)

会议地点: 北京

会议语种:英文

在线出版日期: 2007-10-14（万方平台首次上网日期，不代表论文的发表时间）