期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 33, 期 2, 页码 127-143出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S1383-5866(02)00201-0
关键词
asymmetric membrane; gas separation; defect-free; phase inversion; rheology
Development of defect-free and ultrathin-skinned asymmetric membranes for gas separation process without requiring any additional post-treatments such as curing or coating is a major breakthrough in membrane technology. Correlation of primary dry/wet phase inversion process with rheology aspects is a novel approach in membrane research that provides a potential platform to improve membrane performance. The former controls general morphology of membrane, whereas the latter further affects molecular orientation in membrane. Casting solution developed in this study consisted of polysulfone, tetrahydrofuran (THF), N,N-dimethylacetamide (DMAc) and ethanol (EtOH). The produced membranes were tested with hydrogen and nitrogen as test gases. Essentially defect-free and ultrathin skin layer was achieved for asymmetric polysulfone membranes. Selectivity of these membranes was relatively higher compared to conventional membranes, some of them even surpassed the intrinsic selectivity. (C) 2003 Elsevier B.V. All rights reserved.
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