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Pervaporation of Ethanol/Water Mixtures by PDMS / PVDF Composite Membranes with High Permeability

Authors： Tang Qiao-yu1 Wang Li1 Zhan Xia2 Li Shi-zhong1* Li Jiding2 Li Tian-cheng1

Units： 1 Institute of Nuclear and New Energy Technology , Tsinghua University , Beijing 100084 , China

KeyWords： pervaporation; ethanol selective; PDMS; PVDF

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2011,31(6):1-5

Abstract：

Polydimethylsiloxane (PDMS) / polyvinylidene fluoride (PVDF) composite membrane was prepared by casting PDMS solution onto polyvinylidene fluoride ( PVDF) porous membranes. The resulted PDMS/ PVDF composite membranes were applied for the pervaporation of ethanol/ water mixtures to determine the application feasibility for solid state fermentation.The effect of cross-linking temperature, operation temperature , ethanol concentration in feed and the permeation pressure on pervaporation performance was investigated systematically. The results showed that the permeation flux reached 281.36 g/ (m2•h) with separation factor of 8.23 at 60 ℃. As the operation temperature increased, the separation factor first increased, and then declined. But as the ethanol concentration in feed increased, the permeation flux increased. And as the downstream pressure of membrane declined, both separation factor and permeation flux increased.

Funds：

国家科技支撑项目（2007BAD42D01），科技部国际合作项目（2010DFA61200），国家973项目（2009CB623404）；国家自然科学基金项目（20736003,20906056）；中国博士后基金(20100470015)；

AuthorIntro：

唐俏瑜（1986-），海南省澄迈县人，女，硕士生，主要从事化学反应工程和生物质能源化工方面的研究； *通讯作者：李十中：（1962-），男，教授，博士生导师，通讯联系人，电话(010)62772123,E-mail:szli@tsinghua.edu.cn。

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