论文部分内容阅读
采用聚二甲基硅氧烷/聚醚酰亚胺(PDMS/PEI)膜渗透汽化分离正丁醇/乙醇/水体系,考察进料温度、进料组成等条件对膜渗透汽化分离性能的影响;采用Arrhenius型半经验渗透通量关联模型描述PDMS-PEI膜分离正丁醇/乙醇/水体系膜通量变化。结果表明,当原料液中正丁醇质量分数分别为4.0%、4.5%和5.0%时,正丁醇/乙醇/水三元体系中正丁醇渗透通量分别至少提高14.2%、17.7%和23.4%。渗透通量关联模型能较好地描述PDMS-PEI膜分离正丁醇/乙醇/水体系膜渗透通量变化。
The separation of n-butanol / ethanol / water by polydimethylsiloxane / polyetherimide (PDMS / PEI) membranes was carried out to study the effects of feed temperature and feed composition on membrane pervaporation separation The Arrhenius-type semi-empirical correlation model was used to describe the membrane flux changes of n-butanol / ethanol / water system separated by PDMS-PEI membrane. The results showed that the n-butanol flux in the n-butanol / ethanol / water ternary system increased by at least 14.2%, 17.7% and 23.4% when the n-butanol content in the feed solution was 4.0%, 4.5% and 5.0% . The permeation flux correlation model can well describe the change of membrane permeation flux of n-butanol / ethanol / water separation of PDMS-PEI membranes.