动态LBL组装聚离子膜对乙醇/水体系的渗透汽化性能  被引量:1

Pervaporation separation of water-ethanol by dynamic polyion composite membrane

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作  者:谷维梁[1] 张国俊[1] 纪树兰[1] 刘忠洲[2] 

机构地区:[1]北京工业大学环境与能源工程学院,北京100022 [2]中国科学院生态环境研究中心,北京100085

出  处:《膜科学与技术》2007年第3期40-43,共4页Membrane Science and Technology

基  金:国家重点基础研究发展项目"973"计划资助(2003CB615701)

摘  要:采用动态层-层吸附成膜法(动态LBL),以聚醚砜超滤膜为基膜,以聚丙烯酸(PAA)、聚乙烯亚胺(PEI)为聚离子制备了聚离子复合膜.考察了动态成膜与静态吸附成膜的膜性能比较,研究了动态过滤时间、聚离子浓度、进料浓度、温度等因素对该复合膜渗透汽化性能的影响;并对复合膜表面和截面做了扫描电镜分析.在40℃时,该复合膜对乙醇/水体系的分离因子可达1300,渗透通量约150 g/(m2.h),体现了较好的渗透汽化分离性能.The dynamic polyion composite membranes were prepared by depositing polyacrylic acid(PAA) and polyethyleneimine (PEI) alternatively on the ultrafiltration support membrane under a certain pressure. The polyion composite membranes were used to separate of water- ethanol mixture in a pervaporation apparatus. The performance of dynamic LBL polyion membrane was compared with that of the static LBL membrane. The findings suggested that the high separation factor could be obtained with only 4 composite layers in dynamic LBL polyion membrane. The filtrating time, temperature and weight ratio of water in the feed, and the polyion concentration were investigated. The surface and cross- section of polyion composite membranes were observed by SEM. The dynamic polyion composite membranes showed good pervaporation performance for the separation of water- ethanol mixture. Under the temperature of 40 ℃, the separation factor and the permeate flux were about 1300 and 150 g/(m^2·h), respectively.

关 键 词:动态LBL 渗透汽化 聚丙烯酸 聚乙烯亚胺 聚离子复合膜 

分 类 号:TB383.2[一般工业技术—材料科学与工程]

 

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