Abstract
Ionic liquids (ILs) have been recently considered as potential entrainers for extractive distillation. The use of ILs may affect the vapor-liquid properties to aid the separation of azeotropic mixtures. In particular, their effectiveness has been observed for ethanol dehydration, showing promising perspectives for their industrial implementation. However, there is still a lack of information about the effect of ILs on the system controllability. The objective of this work is to explore the dynamic implications of the use of two types of ionic liquids on the ethanol dehydration process. An equimolar feed mixture of ethanol and water was considered, and different IL concentrations were tested. The results show that changing the IL concentration affect the degree of stabilization of the product stream, even when smooth dynamic responses were in many cases observed.
Highlights
The ethanol dehydration process has recently received renewed attention because of the sudden increase of bioethanol production as an alternative source of energy
As for the use of Ionic liquids (IL) for ethanol dehydration, we showed in a previous work that the IL concentration has a direct effect on the design parameters for extractive distillation systems [16]
A control analysis for an ethanol-water extractive distillation system under the implementation of two types of ionic liquids used as entrainers, [mim]Cl and [bmim]Cl, has been presented
Summary
The ethanol dehydration process has recently received renewed attention because of the sudden increase of bioethanol production as an alternative source of energy. The environmental advantages of bioethanol have been evaluated by different performance indexes such as life cycle analysis, net energy produced, greenhouse gas emissions and agricultural impact [1–3]. Relevant factors such as net energy value (fuel energy minus energy used for production) and carbon footprint depend on two main parameters, namely the nature of the feedstock and the production process. Hoch and Espinosa [4] presented an evolutionary optimization procedure based on a superstructure and its formulation as a mixed integer nonlinear programming problem They considered the use of extractive distillation with ethylene glycol, Another relevant variable for the design of ethanol dehydration systems is the selection of an entrainer that provides a suitable separation.
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