CS/PVA-GA渗透蒸发膜分离偏二甲肼/水体系的实验研究

将壳聚糖(CS)和聚乙烯醇(PVA)按一定比例共混,再以戊二醛(GA)交联,制备CS/PVA-GA共混交联膜,研究了共混交联膜的结构、力学性能以及在偏二甲肼/水体系中的渗透蒸发脱水性能。结果表明,CS与PVA共混、GA交联,形成了致密的空间网状结构,随PVA含量增加,膜的抗张强度降低,而断裂伸长率增加。料液浓度、温度、膜厚度等因素对膜的渗透蒸发性能有较大影响,当料液中偏二甲肼的质量分数为50%,温度为20℃,渗透侧压力为100 Pa,膜厚约为25μm时,CS/PVA-GA共混交联膜的分离因子达到243,渗透通量可达167 g/(m2.h)。

The experimental study of the CS/PVA-GA pervaporation membrane in UDMH/H2O system

Chitosan(CS) was blended with polyvinyl alcohol(PVA) by a certain percentage,and then was cross-linked by glutaraldehyde(GA).The CS/PVA-GA mixed associated membrane was prepared.Mixed associated membrane structure,mechanical properties as well as pervaporation performance in UDMH/H2O system were studied.The results showed that the blending of CS and PVA and GA cross-linked form a dense spatial network structure.With the PVA content increasing,the tensile strength of the membrane was decreased,while the rupturing and extending rate was increased.The feed concentration,temperature,film thickness and other factors have great impact on the membrane pervaporation performance.When UDMH of the feed solution mass fraction reaches 50%,temperature is 20 ℃,the permeate side pressure is 100 Pa and film thickness is about 25 μm,the CS/PVA-GA membrane separation factor reaches 243,the permeate flux can be of 167 g/(m2 ·h).