高等学校化学学报

高等学校化学学报 ›› 1993, Vol. 14 ›› Issue (4): 559.

• 研究论文 • 上一篇    下一篇

填充沸石的聚乙烯醇膜的性质及其在催化酯化反应中的应用

高滋1, 乐英红1, 李文俊2   

  1. 1. 复旦大学化学系, 上海 200433;
    2. 复旦大学材料科学系
  • 收稿日期:1992-08-28 修回日期:1992-11-15 出版日期:1993-04-24 发布日期:1993-04-24
  • 通讯作者: 高滋

Properties of Zeolite-Filled Polyvinyl Alcohol Membrane and Its Application to Catalytic Esterification

GAO Zi1, YUE Ying-Hong1, LI Wen-Jim2   

  1. 1. Department of Chemistry, Fudan University, Shanghai, 200433;
    2. Department of Material Science, Fudan University, Shanghai
  • Received:1992-08-28 Revised:1992-11-15 Online:1993-04-24 Published:1993-04-24

PDF (PC)

被引次数

8

摘要： 考察了KA、NaA、CaA及NaX沸石填充的聚乙烯醇膜在不同醇/水体系中的分离性能,发现经沸石填充后膜的通量增加,而分离系数的升降则取决于被分离醇分子及沸石的孔径大小。对于小分子醇/水体系,填充膜分离系数下降,反之则上升。经考察KA填充膜对乙酸乙酯化和水杨酸甲酯化的膜助催化反应发现,填充膜对反应的推动作用较未改性膜有了进一步的提高。

关键词: 聚乙烯醇膜, 沸石填充膜, 醇水分离, 催化酯化

Abstract: The composite membrane consisting of zeolites KA,NaA,CaAor NaXand poly vinyl alcohol polymer were prepared.The pervaporation and separation characteristics of different alcohol-water systems through these membranes were investigated at temperatures ranging from 20℃ to 50℃-Distinct improvement on molecular transport and the molacular sieving effect of the zeolites have been observed.The addition of zeolite filler to PVAmembrane appears to improve the flux of the membrane in various alcohol/water systems.The order of the increment of flux is.NaX>CaA>NaA>KA, which runs parallel to the increase in pore size of the zeolites.The separation factor of the zeolite-filled membranes can be increased or decreased depending on the kind of zeolite filled and the size of the alcohol molecule.For CH3OH/H2Oand C2H5OH/H2Osystems, at a higher temperature the flux of the KAfilled membrane is improved, while its separation factor remains unchanged.Hence the performance of KAfilled membrane in the separation of CH3OHand C2H5OHfrom aqueous mixtures is better than that of the unfilled PVAmembrane.The esterification of acetic acid by ethanol is aided by the KAmembrane, and the time required to attain 95% conversion is reduced by 9 h as compared with the unfilled PVAmembrane.For the esterification of salicylic acid by methanol, the addition of KAinto the membrane increases the reaction conversion by 1.2 times as well.

Key words: Poly vinyl alcohol pervaporation membrane, Zeolite-filled membrane, Aicohol/water separation, Catalytic esterification

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