Homogeneous azeotropic distillation: separability and flowsheet synthesis

Laroche, Lionel; Bekiaris, Nikolaos; Andersen, Heidi Lie; Morari, Manfred

doi:10.1021/ie00009a017

Cited by 83 publications

(72 citation statements)

References 8 publications

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“…The selection of an appropriate entrainer comprises a major design decision in the case of extractive distillation and heteroazeotropic distillation [11]. Candidate compounds can be selected from established databases based on their selectivity [12].…”

Section: Entrainer Selectionmentioning

confidence: 99%

“…Therefore, the regions of feasible product compositions of columns operated at finite reflux ratios do not match those of columns operated at total reflux. At finite reflux ratios, it is possible to find feasible designs that are infeasible at total reflux [11,25], while other designs are only feasible at total reflux or at very high reflux ratios.…”

Section: Columns Operated At a Finite Reflux Ratiomentioning

confidence: 99%

“…The degree of deviation depends on the curvature of the boundaries. Though split feasibility of finite reflux distillation is different from both, total reflux and reversible distillation [11,34], PDBs and SDBs or TRBs can be used to bound the feasible products of a real distillation column. In particular, achievable products in a real distillation column are confined by those reached in a separation at minimum work (reversible distillation, PDB) and those reached in a separation at maximum work (total reflux distillation, SDB or TRB) [25,53].…”

Section: Feasible Product Specificationsmentioning

confidence: 99%

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Conceptual Design of Azeotropic Distillation Processes

2014

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Section: Entrainer Selectionmentioning

confidence: 99%

Section: Columns Operated At a Finite Reflux Ratiomentioning

confidence: 99%

Section: Feasible Product Specificationsmentioning

confidence: 99%

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Conceptual Design of Azeotropic Distillation Processes

2014

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“…The idea for examining this situation came from the multiplicities reported by Laroche et al (1990Laroche et al ( , 1991Laroche et al ( , 1992. The homogeneous mixture under consideration is that of acetone (L), heptane (H) and benzene (I).…”

Section: Infinite Reflux and Infinite Number Of Traysmentioning

confidence: 99%

“…The starting point for the study presented here were the multiple steady states reported by Laroche et al (1990Laroche et al ( , 1991Laroche et al ( , 1992 for a homogeneous ternary mixture (acetone -heptane -benzene) with nonideal VLE and constant molar flows.…”

Section: Introductionmentioning

confidence: 99%

Multiple Steady States in Homogeneous Azeotropic Distillation

Bekiaris

Meski

Radu

et al. 1993

1993 American Control Conference

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102

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In this article we study multiple steady states in ternary homogeneous azeotropic distillation. We show that in the case of infinite reflux and an infinite number of trays one can construct bifurcation diagrams on physical grounds with the distillate flow as the bifurcation parameter. Multiple steady states exist when the distillate flow varies non-monotonically along the continuation path of the bifurcation diagram. We derive a necessary and sufficient condition for the existence of these multiple steady states based on the geometry of the distillation region boundaries. We also locate in the composition triangle the feed compositions that lead to these multiple steady states. We further note that most of these results are independent of the thermodynamic model used. We show that the prediction of the existence of multiple steady states in the case of infinite reflux and an infinite number of trays has relevant implications for columns operating at finite reflux and with a finite number of trays. Using numerically constructed bifurcation diagrams for specific examples, we show that these multiplicities tend to vanish for small columns and/or for low reflux flows. Finally, we comment on the effect of multiplicities on column design and operation for some specific examples.

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Distillation, Azeotropic and Extractive

Doherty¹,

Knapp²

2000

Kirk-Othmer Encyclopedia of Chemical Technology

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Many industrial processes depend on efficient separation methods for azeotropic or other close‐boiling or low relative volatility mixtures. Whereas ordinary distillation is either uneconomical or impossible in these cases, the addition of specially chosen separating agents can generally facilitate the separation. Four of the five principal techniques employed are discussed: extractive or homogeneous azeotropic distillation, where the liquid separating agent is completely miscible; heterogeneous azeotropic distillation, where the agent, known as the entrainer, forms one or more azeotropes but causes immiscibility; distillation in the presence of ionic salts, which alters the relative volatilities of the components; and pressure‐swing distillation, where a series of columns operate at different pressures. Residue curve maps, material balance lines, and column sequences are given for several commercially important systems. Methods for evaluating total annualized costs are also discussed as are models for determining feasible separating agents.

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Homogeneous azeotropic distillation: separability and flowsheet synthesis

Cited by 83 publications

References 8 publications

Conceptual Design of Azeotropic Distillation Processes

Conceptual Design of Azeotropic Distillation Processes

Multiple Steady States in Homogeneous Azeotropic Distillation

Distillation, Azeotropic and Extractive

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