中文摘要：

采用聚二甲基硅氧烷（PDMS）对聚砜（PSf）、聚偏氟乙烯（PVDF）两种不同材料中空纤维膜结构填料进行了疏水涂覆改性,并研究了改性前后膜结构填料在异丙醇/水体系精馏分离中的材料性能变化。实验结果表明：PDMS涂覆使PVDF膜的分离效果提高了约20%,但使PSf膜的分离效果下降3%～10%。经涂覆后,膜结构填料的传质单元高度均在20cm以下,最小可达5cm左右;所有膜结构填料均可突破传统精馏操作弹性限制,其传质时间小于10s,水力学特性和传质效率更优。

英文摘要：

The composite polydimethylsiloxane（PDMS）/polysulfone（PSf）and PDMS/polyvinylidenefluoride（PVDF）hollow fiber membranes were prepared by dip-coating modification for the distillation of isopropanol（IPA）/water solution.Compared with the PVDF and PSf hollow fiber membrane contactors,the distillate concentration of membrane contactors packed with PDMS/PVDF and PDMS/PSf hollow fibers was increased by 20% and decreased by 3%～10%,respectively.The height of mass transfer unit of modified packing could be less than 20 cm and the minimum is 5 cm.Mass transfer time was generally less than 10 s.All contactors can be operated normally without considering the flooding and loading limits of conventional packings,which presents great advantages in both hydraulic performance and separation efficiency.