Separation Of Ethanol By Pervaporation : Recent Developments

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SEPARATION OF ETHANOL BY PERVAPORATION: RECENT DEVELOPMENTS

Submitted By:
Vinod Godara (Roll No. 11010760)
B.Tech. Undergraduate, Final Year,
Dept. of Chemical Engineering,
IIT Guwahati,
Email: g.vinod@iitg.ernet.in
Abstract:
Bio-alcohols are produced from biomass by fermentation, and distillation is commonly used to separate the alcohol from the aqueous phase. This is, however, a high energy consumption process, and alternative approaches to this separation are being pursued. In this report, we will study the separation of ethanol and water using pervaporation.

Pervaporation is a complex separation process and the separation characteristics may be strongly influenced by composition. The process is used mainly to separate or remove a very small amount of liquid from liquid mixture. If membrane used for pervaporation is very selective, only heat of vaporization of almost pure permeate has to be supplied. This separation process become very useful if mixture to be separated forms azeotrope (where liquid and vapour have same composition) at given conditions. These mixtures cannot be separated using normal distillation. Mixture of an organic solvent like ethanol exhibit an azeotrope in the composition region of the pure organic solvent. So use of pervaporation is very advantageous to dehydrate these type of mixtures.

Membrane-based pervaporation processes have been intensively studied for separation of organic mixtures and dehydration of aqueous/organic solutions

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