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

Chem. J. Chinese Universities ›› 1994, Vol. 15 ›› Issue (7): 1081.

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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

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

Abstract

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

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ZHANG Fu-Yao, ZHANG Yi-Feng, SHEN Zhi-Quan. Pervaporation Separation of Water-Ethanol Mixtures Through the Modified Chitosan Membranes(Ⅱ)─The Blend Membranes of Chitosan and Carboxymethyl Cellulose[J]. Chem. J. Chinese Universities, 1994, 15(7): 1081.

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

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