摘要
研制了新型纯硅沸石Silicalite-1/聚二甲基硅氧烷(PDMS)无机有机复合膜,进行了乙醇/水渗透汽化性能评价实验,采用扫描电镜(SEM)和X射线衍射(XRD)对膜的物理及微观结构分析和表征.分别采用原位法和晶种法制备性能相异的纯硅底膜.通过调控PDMS溶液的浓度来控制涂层的厚度和性能,研究Silicalite-1层和PDMS层对复合膜性能的影响.结果表明:所制备的无机有机复合膜在渗透汽化过程中表现出良好的稳定性,在保持高渗透通量的同时,复合膜的选择性得到了相当的提高.在60℃和乙醇质量分数为5%时,复合膜的通量和分离系数分别高达2.67 kg/(m2.h)和54.9.
Ethanol was separated from ethanol/water mixtures by pervaporation using a novel hydrophobic Silicalite-1/polydimethylsiloxane （PDMS） composite membrane. The prepared composite membrane was characterized by XRD and SEM. In-situ and second seeded crystallization methods were applied to prepared Silicalite-1 membrane with different performances and the thickness of PDMS layer was controlled by PDMS concentration. The influence of Silicalite-1 and PDMS layers on the the pervaporation performance of composite membrane was investigated by pervaporation test. The composite membrane exhibites a relative better stability and it shows a high permeation flux and selectivity of ethanol over water. The flux of ethanol/water is up to 2. 67 kg/（m^2 · h） and the separation factor reaches 54.9.
出处
《膜科学与技术》
CAS
CSCD
北大核心
2010年第3期39-43,共5页
Membrane Science and Technology
