影响渗透汽化中空纤维复合膜分离性能的制备工艺研究

采用聚乙烯醇（ＰＶＡ）为分离层的模材料，以浸涂工艺把ＰＶＡ复合到聚砜（ＰＳ）或聚丙烯腈（ＰＡＮ）的中空纤维支撑层上，在长度为０．４ｍ的不锈钢管中组装若干根中空纤维复合膜测定对乙醇水溶液的渗透汽化（ＰＶ）分离性能。结果表明，ＰＶＡ／ＰＡＮ中空纤维复合膜的性能优于ＰＶＡ／ＰＳ，内径较大（１．３ｍｍ）的优于内径上（０．４ｍｍ）者，ＰＶＡ水溶液在中空纤维支撑层上的涂复次数对复合膜ＰＶ分离性能、以及ＰＶＡ／

RESEARCHES ON EFFECT OF PREPARATION PROCESS OF HOLLOW FIBER C OMPOSITE MEMBRANE ON SEPARATION PERFORMANCE FOR PERVAPORATION

Polyvinyl alcohol (PVA) as a membrane material of the separation layer was composited on polysulfone(PS) or polyacrylonitrile(PAN) hollow fiber as a supporting layer by dip coating process. The composite membranes were assembled in a stainless steel tube with the length of 0.4m,and the separation performance of the composite membrane for an aqueous alcohol was determined by pervaporation. The results shown that the separation performance of PVA/PAN is superior to that of PVA/PS, and that of the bigger interior radius is better than that of the smaller radius for the hollow fiber composite membrane. The dip coating times of the hollow fiber support in the PVA solution,and the crossing process of the PVA/PAN composite membrane obviously affected the separation performance of the composite membrane and the poresize variation of hollow fiber membrane in the course of heat treatment.The differences of ratio of length to interior radius of the oomposite membrane and the pressure on the down stream of the membrane have obviosly intluence on the PV separation performane.