Increasing the Energy Efficiency of Extractive Distillation

Taylor, Matthew; Wankat, Phillip C.

doi:10.1081/ss-120027398

Cited by 24 publications

(13 citation statements)

References 4 publications

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“…Other configurations have been proposed in order to reduce the energy consumption and increase the thermodynamic efficiency of the extractive distillation, like batch extractive middle vessel column (Safrit and Westerberg, 1997a,b;Safrit et al 1995;Hilmen et al, 1997;Warter and Stichlmair, 1999;Low and Sorensen, 2002;Cui et al, 2002), column with partial condenser (Taylor and Wankat, 2004), thermal integration secondary reflux and vaporization (Batista and Meirelles, 1997), thermally coupled extractive and regeneration columns (Errico and Rong, 2012;You et al, 2016b), or double boiler batch column configurations (Hua et al, 2007), Petlyuk column with complex arrangements (Timoshenko et al, 2005;Gutiérrez-Guerra et al, 2009), or extractive dividing-wall column configuration (Midori et al, 2000;Bravo-Bravo et al, 2010;Yildirim et al, 2011;Kiss and Ignat, 2012;Kiss and Suszwalak, 2012;Xia et al, 2012;Wu et al, 2013;Modla, 2013;Sun et al, 2014;Zhang et al, 2014;Luo et al, 2015;Huang et al, 2016;, and more).…”

Section: 1mentioning

confidence: 99%

“…Other special configurations have been proposed, like column with partial condenser (Taylor and Wankat, 2004), extractive column with a side stream (Han et al, 2015), thermal coupling between the extractive and entrainer regeneration columns (Errico and Rong, 2012;You et al, 2016b), thermal integration secondary reflux and vaporization (Batista and Meirelles, 1997), heat integrated distillation column (HIDiC) (Jana, 2010;Kiss and Olujić, 2014), side-stream extractive distillation (Tututi-Avila et al, 2017), Peyluk column with complex arrangement (Timoshenko et al, 2005;Gutiérrez-Guerra et al, 2009) and extractive dividing-wall column (Bravo-Bravo et al., 2010), merging the pre-concentrator column with the extractive column (An et al, 2015) or the entrainer regeneration column (Liang et al, 2014;Dongmin and Yanhong, 2018). The lists is not exhaustive.…”

Section: Continuous Operating Modementioning

confidence: 99%

See 1 more Smart Citation

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: 1mentioning

confidence: 99%

Section: Continuous Operating Modementioning

confidence: 99%

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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“…Because the extractive column uses an external entrainer, an additional column is required for its recovery. Several studies have used this configuration as a base case for comparison with different alternatives [76,77]. Aviles Martinez et al [78] proposed two hybrid flowsheets where liquid-liquid extraction was used to reduce the energy demand of distillation-based alternatives.…”

Section: Hybrid Liquid-liquid Extraction/distillation Processes For Bmentioning

confidence: 99%

5. Process synthesis and intensification of hybrid separations

Errico¹

2017

Process Synthesis and Process Intensification

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Terms of use This work is brought to you by the University of Southern Denmark through the SDU Research Portal. Unless otherwise specified it has been shared according to the terms for self-archiving. If no other license is stated, these terms apply: • You may download this work for personal use only. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying this open access version If you believe that this document breaches copyright please contact us providing details and we will investigate your claim.

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“…The entrainer requires certain characteristics in order to make a process feasible 19, 20. In this process, entrainer feed flow rate and reflux ratio of the extractive column represent the crucial design degrees of freedom that govern feasibility and operating cost 21.…”

Section: Introductionmentioning

confidence: 99%

“…Then it is recovered as the bottom product of the column to be separated in the regeneration column. Commonly used solvents in extractive ethanol distillation are glycols 16–22, glycerol 23, and gasoline 24, 25. Lee and his team studied the extractive process using solvent mixtures and tried to achieve a balance between the solvent's capacity (solvency) and selectivity, as in most cases solvents with high selectivity for the key components to be separated have a low capacity, and vice versa 17.…”

Section: Introductionmentioning

confidence: 99%

Energy Evaluation of Ethanol Dehydration with Glycol Mixture as Entrainer

2014

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Extractive distillation of ethanol dehydration using glycols as entrainers is proposed. Specifically, ethanol dehydration of an azeotropic mixture in the presence of ethylene glycol + glycerol mixture is evaluated. Simulation is performed and the vapor‐liquid equilibrium of ethanol + water + ethylene glycol + glycerol is predicted with the NRTL model. Minimization of energy consumption in both extractive and regeneration columns is attempted. Optimal operating parameters of the process including glycol concentration in the solvent mixture, main feed, and entrainer feed trays, total number of theoretical trays, and heat supplied to the reboiler are determined in order to achieve a specified distillate purity of 99.9 mol % ethanol.

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Increasing the Energy Efficiency of Extractive Distillation

Cited by 24 publications

References 4 publications

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

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

5. Process synthesis and intensification of hybrid separations

Energy Evaluation of Ethanol Dehydration with Glycol Mixture as Entrainer

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