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Anhydrous ethanol: A renewable source of energy

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  • Kumar, Santosh
  • Singh, Neetu
  • Prasad, Ram

Abstract

Anhydrous ethanol is one of the biofuels produced today and it is a subset of renewable energy. It is considered to be an excellent alternative clean-burning fuel to gasoline. Anhydrous ethanol is commercially produced by either catalytic hydration of ethylene or fermentation of biomass. Any biological material that has sugar, starch or cellulose can be used as biomass for producing anhydrous ethanol. Since ethanol-water solution forms a minimum-boiling azeotrope of composition of 89.4 mol% ethanol and 10.6 mol% water at 78.2 °C and standard atmospheric pressure, the dilute ethanol-water solutions produced by fermentation process can be continuously rectified to give at best solutions containing 89.4 mol% ethanol at standard atmospheric pressure. Therefore, special process for removal of the remaining water is required for manufacture of anhydrous ethanol. Various processes for producing anhydrous ethanol have been used/suggested. These include: (i) chemical dehydration process, (ii) dehydration by vacuum distillation process, (iii) azeotropic distillation process, (iv) extractive distillation processes, (v) membrane processes, (vi) adsorption processes and (vii) diffusion distillation process. These processes of manufacturing anhydrous ethanol have been improved continuously due to the increasingly strict requirements for quantity and quality of this product. The literature available on these processes is reviewed. These processes are also compared on the basis of energy requirements.

Suggested Citation

  • Kumar, Santosh & Singh, Neetu & Prasad, Ram, 2010. "Anhydrous ethanol: A renewable source of energy," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(7), pages 1830-1844, September.
    • Handle: RePEc:eee:rensus:v:14:y:2010:i:7:p:1830-1844
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    1. Cardona Alzate, C.A. & Sánchez Toro, O.J., 2006. "Energy consumption analysis of integrated flowsheets for production of fuel ethanol from lignocellulosic biomass," Energy, Elsevier, vol. 31(13), pages 2447-2459.
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