膜科学与技术

高选择性PDMS/PVDF复合膜渗透汽化分离乙醇/水混合物

作者：唐俏瑜¹王莉¹ 展侠² 李十中¹ 李继定² 李天成¹

单位： 1 清华大学核能与新能源技术研究院 801室，北京，100084

关键词：渗透汽化；优先透醇；聚二甲基硅氧烷(PDMS)；聚偏氟乙烯(PVDF)

出版年,卷(期):页码： 2011,31(6):1-5

摘要：

本研究以聚偏氟乙烯(PVDF) 为基膜、聚二甲基硅氧烷(PDMS)为选择层制备了PDMS/ PVDF 复合膜，应用于渗透汽化分离乙醇/水混合物。作者系统研究了膜交联温度、操作温度、物料浓度和膜下侧压力对乙醇/水混合物的渗透汽化分离性能的影响，发现经130℃交联的复合膜在温度为60 ℃时，对乙醇的分离因子为8.23，可将乙醇浓度从25 vol%提升至74 vol%左右，其渗透通量达到281.36 g/ (m2•h)。随着操作温度的升高，分离因子先上升后下降；而随物料中乙醇浓度的升高，渗透通量增大。膜渗透侧压力越小，分离系数和渗透通量均提高。

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.

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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