【摘要】 对聚苯醚(PPO)进行了溴代反应,采用凝胶相转化法制备溴代聚苯醚(BPPO)非对称膜.通过扫描电镜(SEM)观察膜表面及断面形貌,并以低浓度乙醇/水体系为研究对象,考察了添加剂含量、BPPO浓度、料液组成及料液温度对BPPO膜渗透汽化分离性能的影响.结果表明,该非对称膜较文献报道中的PPO膜,其分离因子有了明显的提高,在60℃添加剂浓度9.9%,BPPO浓度10%,进料液乙醇浓度5%时,膜的渗透通量236.4 g/(m2.h),其对乙醇的分离因子达到16.74.随着料液中乙醇浓度的增大,BPPO膜的分离因子减小,渗透通量增大;而随料液温度的升高,BPPO膜的分离因子及渗透通量均增大.更多还原

【Abstract】 In order to get a good membrane material,bromide PPO(BPPO) was made,and BPPO asymmetric membrane was prepared through phase inversion process.The surface and section morphology of the membrane were observed by scanning electron microscopy(SEM).The effects of additive content,BPPO concentration,feed solution composition and feed solution temperature on the pervaporation performance of dilute ethanol/water solutions were also studied.The results show that the separation performance of BPPO membrane is excellent.When the additive content was 9.9%,the BPPO concentration was 10%,the feed concentration was 5% and the feed solution temperature was 60 ℃,the total permeation fiux and the separation factor for ethanol could be 236.4 g/(m2·h)and 16.74,respectively.With the increasing of ethanol concentration in the feed solution,the selectivity of BPPO membrane decreases,while the permeation flux increases;with the increasing of feed solution temperature,both the separation factor and the permeation flux increases.更多还原