Analysis and control of heteroazeotropic batch distillation

Skouras, Stathis; Skogestad, Sigurd; Kiva, V. N.

doi:10.1002/aic.10376

Cited by 27 publications

(20 citation statements)

References 22 publications

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“…The practically useful policies for regular operation are: Policy 9 with r R = 1 and r W = 0 is, what Lang and Modla [53] call Mode II, Strategy A, Version 1, where the E-rich phase is entirely refluxed, and the E-lean phase is withdrawn as distillate (or accumulated in the decanter). This is the traditional and conceptually most straightforward operational policy [51].…”

Section: Rigorous Simulationmentioning

confidence: 99%

“…By Mode II, distillation and phase separation occurs simultaneously and the reflux has different composition than that of the condensate. For Mode II there are two separation strategies as presented by Koehler et al [52] and Skouras et al [50,51]. By Strategy A the entrainer-rich phase is totally, and by Strategy B only partially refluxed, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…In order to increase the recovery by maintaining the phase split longer time, the entrainer-lean phase could also be partially refluxed. Skouras et al [50,51] distinguished two main types of batch heteroazeotropic distillation. By Mode I, distillation and the liquid-liquid phase split are applied sequentially, that is the composition of the reflux (and the distillate) equals that of the condensate (as by Pham and Doherty [47]), and the existence of two liquid phases is only exploited at subsequent separation of the distillate.…”

Section: Introductionmentioning

confidence: 99%

“…Skouras et al [50,51] extensively studied the closed operation mode of the batch rectifier configuration and multivessel columns. Pommier et al [54] developed a specific software architecture, which uses sequential quadratic programming and genetic algorithm to optimise batch columns.…”

Section: Introductionmentioning

confidence: 99%

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Generalised model for heteroazeotropic batch distillation with variable decanter hold-up

Hégely

Gerbaud

Lang

2013

Separation and Purification Technology

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao. hold-up. (2013) Separation and Purification Technology, vol. 115. pp. 9-19. ISSN 1383-5866 Any correspondance concerning this service should be sent to the repository administrator: staff-oatao@listes-diff.inp-toulouse.fr t r a c tA general model of batch heteroazeotropic distillation is proposed. Both liquid phases present in the decanter can be refluxed or withdrawn as distillate, their hold-up can be increased, decreased or kept constant, as well. By assuming maximal separation, that is, that the composition of the condensate always equals to that of the heteroazeotrope, the still path equation was derived. The still path directions are determined for all the 16 possible operational policies. It is possible to steer the still path in a desired direction by changing the operational parameters, which allows the recovery of a pure component in the still. The still path directions are validated by rigorous simulations for three policies not published yet using the mixture water -formaldehyde -propyl formate. From the 16 operational policies, 11 can be considered as useful in practice. To demonstrate the advantage of using a non-traditional policy, the separation of the mixture aniline -ethylene glycol -water was investigated, as well. By using a non-traditional operational policy with hold-up reduction in the decanter a higher purity of ethylene glycol was obtained in the still.

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Section: Rigorous Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Generalised model for heteroazeotropic batch distillation with variable decanter hold-up

Hégely

Gerbaud

Lang

2013

Separation and Purification Technology

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“…In this work, the whole non-aqueous decanter phase is refluxed. This operating Mode is called Mode II by Skouras (2004Skouras ( , 2005a Column pressure is 1 atm and the pressure drop of the column is 0.05 atm. The process consists of three tasks: filling, infinite reflux and distillation (Water phase removal).…”

Section: Feasibility Analysismentioning

confidence: 99%

Heterogeneous batch distillation processes: Real system optimisation

Pommier¹,

Massebeuf²,

Gerbaud³

et al. 2005

Computer Aided Chemical Engineering

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In this paper, optimisation of batch distillation processes is considered. It deals with real systems with rigorous simulation of the processes through the resolution full MESH differential algebraic equations.Specific software architecture is developed, based on the BatchColumn® simulator and on both SQP and GA numerical algorithms, and is able to optimise sequential batch columns as long as the column transitions are set.The efficiency of the proposed optimisation tool is illustrated by two case studies. The first one concerns heterogeneous batch solvent recovery in a single distillation column and shows that significant economical gains are obtained along with improved process conditions. Case two concerns the optimisation of two sequential homogeneous batch distillation columns and demonstrates the capacity to optimize several sequential dynamic different processes. For such multiobjective complex problems, GA is preferred to SQP that is able to improve specific GA solutions.

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Batch Distillation of Azeotropes

2010

Design and Control of Distillation Systems for Separating Azeotropes

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Analysis and control of heteroazeotropic batch distillation

Cited by 27 publications

References 22 publications

Generalised model for heteroazeotropic batch distillation with variable decanter hold-up

Generalised model for heteroazeotropic batch distillation with variable decanter hold-up

Heterogeneous batch distillation processes: Real system optimisation

Batch Distillation of Azeotropes

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