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Improved separation of azeotropic mixtures of alcohol-water using chitosan membranes

Mohd Nawawi, Mohd Ghazali and Hassan, Hashim and Jalil , Abdul Rahim and Tan, S. H. (2003) Improved separation of azeotropic mixtures of alcohol-water using chitosan membranes. Proceedings of International Conference on Chemical and Bioprocess Engineering . pp. 83-86.

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Abstract

The present study investigates the pervaporation performance of chitosan membranes prepared from locally-produced chitosan polymer. Chitosan were extracted from domestic shrimp shells which can be found abundantly locally via a simple method using strong acid and alkaline treatment. The chitosan membranes were prepared by a solution casting method. It is known that isopropanol-water mixtures form an azeotropic solution at high concentration of isopropanol. Operating at concentration higher than that of azeotropic mixture need a more complicated process such as azeotropic distillation process. Our results showed that the problem can be overcome by means of pervaporation using modified chitosan membranes that were crosslinked with aluminium nitrate and glutaraldehyde. Results shown that the permeation flux decreased for the membrane crosslinked with glutaraldehyde for the whole feed concentration. The overall pervaporation performance for the unmodified and modified membrane were compared in terms of pervaporation separation index (PSI). Membranes crosslinked with aluminium nitrate solution showed a higher PSI up to 90wt% isopropanol in the feed solution while membrane crosslinked with gluteraldehyde were only found to be effective for pervaporation separationn of isopropanol-water mixture at low concentration of isopropanol in feed.

Item Type:Article
Uncontrolled Keywords:Chitosan, crosslinking, isopropanol-water mixtures, pervaporation
Subjects:T Technology > T Technology (General)
Divisions:Chemical and Natural Resources Engineering (Formerly known)
ID Code:6765
Deposited By: Norhani Jusoh
Deposited On:06 Jan 2009 05:44
Last Modified:01 Jun 2010 15:46

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