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Extractive distillation: recent advances in operation strategies

  • Weifeng Shen

    Weifeng Shen obtained his PhD in 2012 with a focus on extractive distillation at University of Toulouse, France, funded by National Natural Science Foundation of China. He has been working in the group of Prof. Ross Taylor at Clarkson University as a research associate since 2012. He received his master’s degree in chemical engineering at Chongqing University, China. His current research interests focus on modeling, simulation, design, optimization of extractive distillation, reactive distillation, DWC, and natural gas treating.

    , Hassiba Benyounes

    Hassiba Benyounes has been an assistant professor at the Department of Chemical Engineering of University of Science and Technology of Oran, Algeria, since 2004. She received her PhD degree in chemical engineering in 2003 from State Academy of Fine Chemical Technology M.V. Lomonossov, Moscow, Russia. Her main research fields are distillation, extractive distillation, thermodynamics, computer-aided simulation, and design of chemical processes. She is a member of Laboratory of Physical Chemistry, Material, and Environnement in Algeria and collaborates with the research group of Prof. Xavier Joulia at the Laboratory of Chemical Engineering of Toulouse.

    und Vincent Gerbaud

    Vincent Gerbaud is a research director at the French National Scientific Research Center CNRS at Laboratoire de Génie Chimique in Toulouse. His research field concerns modeling and simulation in process system engineering, with a strong interest in small-scale modeling: molecular simulation, thermodynamics, computer-aided molecular and mixture design. At the process scale, he has published over 25 articles related to the design and synthesis of extractive and azeotropic distillation for nonideal mixture purification, with a particular interest in thermodynamic insight useful for the design of these processes.

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Veröffentlicht/Copyright: 6. Dezember 2014
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Abstract

Extractive distillation is one of the efficient techniques for separating azeotropic and low-relative-volatility mixtures in various chemical industries. This paper first provides an overview of thermodynamic insight covering residue curve map analysis, the application of univolatility and unidistribution curves, and thermodynamic feasibility study. The pinch-point analysis method combining bifurcation shortcut presents another branch of study, and several achievements have been realized by the identification of possible product cut under the following key parameters: reflux ratio, reboil ratio, and entrainer-feed flow rate ratio. Process operation policies and strategy concerning batch extractive distillation processes are summarized in four operation steps. Several configurations and technological alternatives can be used when extractive distillation processes take place in a continuous or batch column, depending on the strategy selected for the recycle streams and for the main azeotropic feeds.


Corresponding author: Vincent Gerbaud, Université de Toulouse, INP, UPS, LGC (Laboratoire de Génie Chimique), 4 allée Emile Monso, F-31432 Toulouse Cedex 04, France, e-mail: ; and CNRS, LGC (Laboratoire de Génie Chimique), F-31432 Toulouse Cedex 04, France

About the authors

Weifeng Shen

Weifeng Shen obtained his PhD in 2012 with a focus on extractive distillation at University of Toulouse, France, funded by National Natural Science Foundation of China. He has been working in the group of Prof. Ross Taylor at Clarkson University as a research associate since 2012. He received his master’s degree in chemical engineering at Chongqing University, China. His current research interests focus on modeling, simulation, design, optimization of extractive distillation, reactive distillation, DWC, and natural gas treating.

Hassiba Benyounes

Hassiba Benyounes has been an assistant professor at the Department of Chemical Engineering of University of Science and Technology of Oran, Algeria, since 2004. She received her PhD degree in chemical engineering in 2003 from State Academy of Fine Chemical Technology M.V. Lomonossov, Moscow, Russia. Her main research fields are distillation, extractive distillation, thermodynamics, computer-aided simulation, and design of chemical processes. She is a member of Laboratory of Physical Chemistry, Material, and Environnement in Algeria and collaborates with the research group of Prof. Xavier Joulia at the Laboratory of Chemical Engineering of Toulouse.

Vincent Gerbaud

Vincent Gerbaud is a research director at the French National Scientific Research Center CNRS at Laboratoire de Génie Chimique in Toulouse. His research field concerns modeling and simulation in process system engineering, with a strong interest in small-scale modeling: molecular simulation, thermodynamics, computer-aided molecular and mixture design. At the process scale, he has published over 25 articles related to the design and synthesis of extractive and azeotropic distillation for nonideal mixture purification, with a particular interest in thermodynamic insight useful for the design of these processes.

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Received: 2014-8-19
Accepted: 2014-10-10
Published Online: 2014-12-6
Published in Print: 2015-2-1

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