高等学校化学学报

高等学校化学学报 ›› 1994, Vol. 15 ›› Issue (7): 1081.

• 论文 • 上一篇    下一篇

改性壳聚糖膜用于醇水混合液分离的研究(Ⅱ)─壳聚糖－羧甲基纤维素共混物膜

张富尧, 张一烽, 沈之荃   

  1. 浙江大学高分子科学与工程学系, 杭州, 310027
  • 收稿日期:1993-08-19 修回日期:1993-11-29 出版日期:1994-07-24 发布日期:1994-07-24
  • 通讯作者: 张富尧,男,28岁,博士,讲师.
  • 作者简介:张富尧,男,28岁,博士,讲师.
  • 基金资助:

    高等学校博士学科点专项科研基金;浙江省自然科学基金

Pervaporation Separation of Water-Ethanol Mixtures Through the Modified Chitosan Membranes(Ⅱ)─The Blend Membranes of Chitosan and Carboxymethyl Cellulose

ZHANG Fu-Yao, ZHANG Yi-Feng, SHEN Zhi-Quan   

  1. Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 3l0027
  • Received:1993-08-19 Revised:1993-11-29 Online:1994-07-24 Published:1994-07-24

PDF (PC)

摘要： 制备了壳聚糖(CS)─羧甲基纤维素(CMC)共混物膜(I-2),对其成膜反应、溶胀度、交联度及拉伸强度进行了研究,结果表明,壳聚糖与羧甲基纤维素共混物在成膜的同时还发生交联反应；当CS/CMC=1时,交联度最大,此时共混物膜不溶于稀醋酸水溶液。首次将此共混物膜用于乙醇/水混合液的分离,该膜具有优良的醇水分离性能,当CS/CMC=1时,渗透通量和分离因子皆达到最大值[J=0.9kg/(m2·h),a=800,90wt%乙醇,45℃],且该膜的分离因子基本上不随温度变化,醇水透过I-2膜的表现活化能△E为32.6kJ/mol.对CS/CMC2+2+2+2+次序递增,分离因子变化次序则刚好相反。

关键词: 壳聚糖─羧甲基纤维素共混物膜, 渗透蒸发, 醇水分离

Abstract: The process of membrane formation of chitosan(CS)and carboxymethyl cellulose(CMC)was investigated.It was found that the CS/CMCmembrane formation and the crosslinking reaction happened at the same time.The CS/CMCmembranes were used for pervaporation separation of water-ethanol mixtures for the first time.The separation results showed that this membrane had better separation properties than other pervaporation membranes, e.g., separation factor and permeation rate were 800 and 900 g/(m2·h), respectively, when CS/CMC=1.Separation properties were improved when the CS/CMCmembranes were treated with alkaline earth cations and permeation rates increased as follows:Mg2+<Ca2+<Sr2+<Ba2+, while separation factors showed an opposite tendeney.

Key words: CS/CMC membrane, Pervaporation, Separation of water-ethanol mixture

TrendMD: