| 醇／水混合液分离用聚乙烯醇复合膜的渗透汽化特性 |
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| 引用本文： | 施艳荞,陈观文.醇／水混合液分离用聚乙烯醇复合膜的渗透汽化特性[J].高分子学报,1996(2):210-215. |
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| 作者姓名： | 施艳荞 陈观文 |
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| 作者单位： | 中国科学院化学研究所 |
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| 摘 要： | 制备了聚乙烯醇（ＰＶＡ）／聚丙烯睛（ＰＡＮ）渗透汽化复合膜，研究了交联剂用量、底膜结构、进料液组成、操作温度等因素对膜的渗透汽化性能的影响．发现ＰＶＡ／ＰＡＮ复合膜对水／醇混合液表现为水优先透过，进料液中乙醇浓度在６０～９９ｗｔ％的范围内，渗透通量Ｊｔ与温度之间符合Ａｒｒｈｅｎｉｕｓ关系，选择分离系数αＷ／Ｅ也随温度上升而增大．进料液为９５ｗｔ％的乙醇／水混合液时，７５℃下Ｊｔ高达３００～４５０ｇ／ｍ２ｈ，αＷ／Ｅ为８００～１１００．对异丙醇／水、异丁醇／水及甘油／水混合体系，复合膜显示出更为优秀的透过、分离性能．就膜的化学、物理结构与其渗透汽化性能间的关系进行了讨论．
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| 关 键 词： | 聚乙烯醇，均质膜，复合膜，渗透汽化特性 |
THE SEPARATION OF WATER AND ALCOHOL BY PERVAPORATION WITH PVA/PAN COMPOSITE MEMBRANE |
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| SHI Yanqiao, CHEN Guanwen.THE SEPARATION OF WATER AND ALCOHOL BY PERVAPORATION WITH PVA/PAN COMPOSITE MEMBRANE[J].Acta Polymerica Sinica,1996(2):210-215. |
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| Authors: | SHI Yanqiao CHEN Guanwen |
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| Abstract: | Composite membranes with a poly (vinylalcohol) (PVA) layer coated on polyacrylonitrile(PAN) support membranes were evaluated for pervaporation separation of water-alcohol mixtures. The PVA /PAN composite membranes as prepared were water permselective for the ethanol concentration range of 60 to 99wt% in the feed, and the separation factors were 800 ￣ 1100, permeate flux was 300 ￣ 450g/m2hat 75℃ (for ethanol concentration in feed 95wt%). The dependence of the permeate flux on temperature was consistent with the Arrhenius relationship, and the separation factor and permeate flux was increased with increasing operation temperature.PVA /PAN composite membrane has excellent permselectivity for separating mixtures of iso-propanol (or iso-butyl alcohol, glycerin) and water. |
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| Keywords: | Polyvinylalcohol Dense membrane Composite membrane Pervaporation characteristics |
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