›› 2005, Vol. 5 ›› Issue (2): 144-147.
• 反应与分离 • 上一篇 下一篇
李昊,余江,刘会洲
出版日期:
发布日期:
LI Hao,YU Jiang,LIU Hui-zhou
Online:
Published:
摘要： 以乙醇/水及乙酸/水体系为研究对象，研究了渗透汽化过程中料液浓度、温度因素对分离效果的影响；结合乙醇、乙酸对聚二甲基硅氧烷(PDMS)膜的溶胀特性差别，分析并讨论了两者在渗透汽化过程中可能的分离机理. 研究表明，PDMS膜能够优先透醇，但乙酸分子的缔合物以及羧基与疏水PDMS膜高分子链的强相互作用降低了其在膜中的扩散速率，使低温时乙酸/水体系优先透水，只有当温度在60℃以上时才表现出优先透酸，且分离效果较差.
关键词: PDMS, 渗透汽化, 乙醇, 乙酸
Abstract: The effects of feed concentration and feed temperature on the flux and selectivity of polydimethylsiloxane (PDMS) pervaporation membrane for separating ethanol and acetic acid from ethanol/water and acetic acid/water mixtures were investigated. The swelling properties of PDMS membrane in ethanol and acetic acid were also examined for exploring the possible separation mechanism in the pervaporation process. The results indicated that pervaporation was quite different for ethanol and acetic acid. Compared with the preferential pervaporation of ethanol through PDMS, the low diffusion rate of acetic acid in PDMS membrane was observed, which made water pass through PDMS membrane prior to acetic acid if the operation temperature was lower than 60℃.
Key words: PDMS, pervaporation, ethanol, acetic acid
李昊;余江;刘会洲. 乙醇/水及乙酸/水体系的渗透汽化分离[J]. , 2005, 5(2): 144-147.
LI Hao;YU Jiang;LIU Hui-zhou. Pervaporation of Ethanol/Water and Acetic Acid/Water Mixtures through PDMS Membranes[J]. , 2005, 5(2): 144-147.
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