Optimization of the Design and Operation of Extractive Distillation Processes

Figueirêdo, M. F.; Brito, Karoline Dantas; Ramos, Wagner Brandão; Vasconcelos, Luís Gonzaga Sales; Brito, Romildo Pereira

doi:10.1080/01496395.2015.1023448

Cited by 20 publications

(35 citation statements)

References 22 publications

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“…21, several hundreds of design match the purity and recovery constraints. Increasing the number of stages in the extractive section is often correlated with a reduction of the entrainer flow rate and a reduction of the reflux ratio, with a positive impact on the energy consumption (De Figueirêdo et al, 2015b). As shown on Fig.…”

Section: Solving Strategiesmentioning

confidence: 86%

Review of extractive distillation. Process design, operation, optimization and control

Gerbaud

Rodríguez-Donis

Hégely

et al. 2019

Chemical Engineering Research and Design

190

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Operation and control Extractive distillation processes enable the separation of non-ideal mixtures, including minimum or maximum boiling azeotropes and low relative volatility mixtures. Unlike azeotropic distillation, the entrainer fed at another location than the main mixture induces an extractive section within the column. A general feasibility criterion shows that intermediate and light entrainers and heterogeneous entrainers are suitable along common heavy entrainers. Entrainer selection rules rely upon selectivity ratios and residue curve map (rcm) topology including univolatility curves. For each type of entrainer, we define extractive separation classes that summarize feasibility regions, achievable products and entrainer-feed flow rate ratio limits. Case studies are listed as Supplementary materials. Depending on the separation class, a direct or an indirect split column configuration will allow to obtain a distillate product or a bottom product, which is usually a saddle point of rcm. Batch and continuous process operations differ mainly by the feasible ranges for the entrainer-feed flow rate ratio and reflux ratio. The batch process is feasible under total reflux and can orient the still path by changing the reflux policy. Optimisation of the extractive process must systematically consider the extractive column along with the entrainer regeneration column that requires energy and may limit the product purity in the extractive column through recycle. For the sake of reducing the energy cost and the total cost, pressure change can be beneficial as it affects volatility, or new process structures can be devised, namely heat integrated extractive distillation, extractive divided wall column or processes with preconcentrator.

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Section: Solving Strategiesmentioning

confidence: 86%

Review of extractive distillation. Process design, operation, optimization and control

Gerbaud

Rodríguez-Donis

Hégely

et al. 2019

Chemical Engineering Research and Design

190

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“…Notice that the tray number is counted from top to down of the column, and the condenser and reboiler are regarded as the first and last tray. The tray efficiency of 85% (De Figueiredo et al, 2015b) is used for calculating TAC. Other costs such as the liquid delivery pumps, pipes, valves are neglected.…”

Section: Economical Evaluationmentioning

confidence: 99%

“…In the extractive distillation process, monitoring the amount of entrainer in the middle (extractive) section, between the entrainer and main feed tray locations, is vital for separating azeotropic mixture. Knapp and Doherty (1994) discussed the minimal amount of entrainer and De Figueiredo et al (2015aFigueiredo et al ( , 2015b used the amount of entrainer on the entrainer feed tray as a constraint for designing the column. In this work we use the efficiency indicator of extractive section E ext and the efficiency indicator of per tray in extractive section e ext that we proposed recently (You et al, 2015a).…”

Section: Separation Efficiency Evaluationmentioning

confidence: 99%

Optimization of pre-concentration, entrainer recycle and pressure selection for the extractive distillation of acetonitrile-water with ethylene glycol

You

Gerbaud

et al. 2018

Chemical Engineering Science

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“…There are a large number of publications on the separation of specific binary azeotropic mixtures and the use of various entrainers to this end, in addition to publications about the common features of continuous and batch extractive distillation of ternary azeotropic mixtures. − Commercial process flow sheet simulation software such as Pro/II and Aspen Plus can simulate extractive distillation units, but they are difficult to use for optimal design of such units due to the large number of optimization parameters, which include the flow rates of liquid and vapor streams in each column section, along with the respective number of trays. In fact, the combined use of commercial software for modeling and design optimization of extractive distillation units requires a tedious investigation of the influence of numerous mode (operating) and design parameters in addition to that of various entrainers and flow sheet configurations. ,,− Another technique for the design of extractive distillation columns is based on using an experimental setup and the random search of mode parameters and number of trays in each section. However, this method does not provide the optimal mode parameters of the process …”

Section: Introductionmentioning

confidence: 99%

Using the Method of Infinitely Sharp Splits for the Optimal Design of Extractive Distillation Units. 1. Ternary Mixtures

Petlyuk¹,

Danilov²,

Adiche

2021

Ind. Eng. Chem. Res.

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In this work, a novel sequential approach for optimal conceptual design of extractive distillation columns for the separation of ternary azeotropic mixtures was developed. This approach is based on the design concepts of the method of infinitely sharp splits. Accordingly, a systematic and simple method for the determination of region of possible mode parameters in extractive section was established. This method also allows a fast and reliable determination of optimal mode parameters in extractive section for the minimum required vapor flow rate and for a specified number of trays in this section. These mode parameters are subsequently used in combination with material balance equations of the column and the tray-to-tray method for the calculation of optimal mode and design parameters in all column sections. It is shown that this design approach is rapid and robust and can readily be applied for the design and synthesis of energy-efficient extractive distillation units including vacuum extractive distillation columns and extractive distillation columns with a dividing wall.

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Optimization of the Design and Operation of Extractive Distillation Processes

Cited by 20 publications

References 22 publications

Review of extractive distillation. Process design, operation, optimization and control

Review of extractive distillation. Process design, operation, optimization and control

Optimization of pre-concentration, entrainer recycle and pressure selection for the extractive distillation of acetonitrile-water with ethylene glycol

Using the Method of Infinitely Sharp Splits for the Optimal Design of Extractive Distillation Units. 1. Ternary Mixtures

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