Unusual trend of increasing selectivity and decreasing flux with decreasing thickness in pervaporation separation of ethanol/water mixtures using sodium alginate blend membranes

被引：11

作者：

Flynn, Eoin J. ^{[1
]}

Keane, Donal ^{[1
]}

Holmes, Justin D. ^{[1
]}

Morris, Michael A. ^{[1
]}

机构：

[1] Natl Univ Ireland Univ Coll Cork, Dept Chem, Environm Res Inst, Cork, Ireland

来源：

JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2012年 / 370卷

关键词：

Selectivity; Flux; Sodium-alginate; Pervaporation; Glass transition temperature; WATER MIXTURES; HYDROGELS; RELAXATION;

D O I：

10.1016/j.jcis.2011.12.022

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Pervaporation membranes were produced comprising a 4:1 sodium-alginate:poly(vinyl-alcohol) polymer blend selective layer with a plasticizing agent (glycerol). Membranes were supported on a poly(acrylonitrile) mesoporous support layer and non-woven fabric base. Pervaporation separation of ethanol/water mixtures was carefully followed as a function of film thickness and time. It was found, contrary to what might be expected from literature, that these films showed increased selectivity and decreased flux as film thickness was reduced. It is argued that the morphology and structure of the polymer blend changes with thickness and that these structural changes define the efficiency of the separation in these conditions. (C) 2011 Elsevier Inc. All rights reserved.

引用

页码：176 / 182

页数：7

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