Abstract
The hydrophobic sorption distillation (HSD) model is proposed to explain the mechanism of pervaporation (PV) of ethanol solution by hydrophobic porous membranes. We tested new PTFE and PP membranes and the results have been compared to previously published PV data. When the permeate flux ( J T) decreases in value, the value of the separation factor ( α) exceeds that of the equilibrium separation factor ( α eq). This is caused by chemical interaction between the solution and the membrane in the effective region. The separation factor is solely dependent upon the membrane material by the parameter Ψ= ερ/ J T. It is possible that PV separation does not occur in the membrane, but rather on the surface of the membrane. PTFE membranes affect more strongly separation than PP membranes due to the greater hydrophobicity of the former membrane.
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