Abstract
This paper deals with permeation and separation characteristics of aqueous ethanol solutions through some chitosan derivative membranes such as chitosan, chitosan acetate and crosslinked chitosan membranes by pervaporation and evapomeation methods. The evapomeation method was found to be better than the pervaporation method for the permeation and separation of aqueous ethanol solutions. Separation factors for aqueous ethanol solutions containing more than 90 wt% of ethanol through a chitosan acetate membrane were about ten times that through a chitosan membrane. Also, the separation factor of a chitosan membrane crosslinked with glutaraldehyde was infinity for a feed of less than 70 wt% of ethanol and was about 20 times the chitosan membrane at 90 wt% of ethanol. Permeation rates of the crosslinked chitosan membrane were greater than those of the chitosan membrane. The permeation and separation characteristics for aqueous ethanol solutions are discussed from the viewpoints of the structure of chitosan derivative membranes and the permeation mechanism through the membrane.
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