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Abstract
The effect of operating temperature on permeation flux in pervaporation was analyzed. In the standard pervaporation processes, both the permeability coefficient of a membrane and the driving force for mass transport are influenced by temperature. The so-called “activation energy” of permeation, E J, conventionally obtained from ln J vs. 1 T plot is a compounded parameter characterizing the overall temperature dependence of permeation flux. The activation energy, E P, characterizing temperature dependence of membrane permeability should be evaluated from the log of driving force-normalized flux vs. 1 T data. When the transmembrane driving force is expressed in terms of partial pressure, E P can be evaluated from ln ( J Δp ) vs. 1 T plot. A rule of thumb for estimating E P is to subtract the molar heat of vaporazation from E J.
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