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Type: Artigo de periódico
Title: Dehydration of ethanol with salt extractive distillation - a comparative analysis between processes with salt recovery
Author: Ligero, EL
Ravagnani, TMK
Abstract: Anhydrous ethanol can be obtained from a dilute aqueous solution of ethanol via extractive distillation with potassium acetate. Two process flowsheets with salt recovery were proposed. In the first, dilute ethanol is directly fed to a salt extractive distillation column and, after that, the salt is recovered in a multiple effect evaporator followed by a spray dryer. In the second, the concentrated ethanol from conventional distillation is fed to a salt extractive distillation column. In this case, salt is recovered in a single spray dryer. In both processes the recovered salt is recycled to be used in the extractive distillation column. Every component of each process was rigorously modeled and its behavior was simulated for a wide range of operating conditions. A global simulation was then carried out. The results show that the second process is more interesting in terms of energy consumption than the first. Furthermore, it would be easier to implement changes on existing benzene extractive anhydrous ethanol plants to convert them to more ecologically attractive concentrated ethanol feed processes. (C) 2002 Elsevier Science B.V. All rights reserved.
Subject: anhydrous ethanol
salt extractive distillation
spray dryer
multiple effect evaporators
Country: Suíça
Editor: Elsevier Science Sa
Citation: Chemical Engineering And Processing. Elsevier Science Sa, v. 42, n. 7, n. 543, n. 552, 2003.
Rights: fechado
Identifier DOI: 10.1016/S0255-2701(02)00075-2
Date Issue: 2003
Appears in Collections:Unicamp - Artigos e Outros Documentos

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