Entropy Production Analysis in Extractive Distillation Using Non-Equilibrium Thermodynamics and a Rate Based Model

Mendoza, Diego F.; Riascos, Carlos A.M.

doi:10.1016/s1570-7946(09)70352-9

Cited by 3 publications

(2 citation statements)

References 8 publications

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“…The lost work is proportional to the entropy generation. The entropy production approach leads to showing the location of energy losses as well as their causes, − and it serves to explain the effect of operational conditions and equipment design on energy efficiency; meanwhile, the entropy production approach helps to define the optimum conditions for minimizing the energy losses. , …”

Section: Introductionmentioning

confidence: 99%

Entropy Flow and Energy Efficiency Analysis of Extractive Distillation with a Heavy Entrainer

Benyounes

Shen

Gerbaud

2014

Ind. Eng. Chem. Res.

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The minimization of the entropy production is equivalent to minimizing the work or energy consumption required by a separation process. Sources of entropy creation during the extractive distillation of a minimum-and maximumboiling azeotropic mixture with a heavy entrainer are evaluated at each column stage in accordance with the second law of thermodynamics, and the distribution of entropy flow in different sections of the column is analyzed. Results show that mixing on feed trays and heat exchange in the reboiler and condenser are the main sources of entropy production. The temperature of the main feed and entrainer feed does not significantly affect the irreversibility of the process at the reference temperature of all flows. Although optimal values can be proposed to achieve a minimum isothermal work, the energy loss of the real process steadily increases with increases in the entrainer/feed flow rate ratio and reflux. The influence of the feed tray shows that product purity tends to vary inversely with energy loss.

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Section: Introductionmentioning

confidence: 99%

Entropy Flow and Energy Efficiency Analysis of Extractive Distillation with a Heavy Entrainer

Benyounes

Shen

Gerbaud

2014

Ind. Eng. Chem. Res.

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“…For example Gil et al considering ethylene glycol and calcium chloride as entrainer, in their simulation 1.8% of solvent makeup was considered. Mendoza and Riascos utilized 5.8% of glycol makeup. It is possible to say that the convenience of the sequence is related to the initial solvent recovery column design that sets the fresh solvent makeup.…”

Section: Complex Configurations Resultsmentioning

confidence: 99%

Optimal Synthesis of Distillation Systems for Bioethanol Separation. Part 2. Extractive Distillation with Complex Columns

Errico

Rong

Tola

et al. 2013

Ind. Eng. Chem. Res.

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In the first part of the work the dehydration of bioethanol by extractive distillation was considered to define the best simple column sequence. It was proved that among all the simple configurations generated, two sequences with three columns are able to consistently reduce the energy demand and the capital costs compare to the four-column sequence used as a reference. Then, starting from the selected simple column configurations different complex sequences were predicted. It was evidenced that thermally coupled configurations realized only a limited saving in the capital costs. The two column configuration with a vapor side stream is able to reduce the capital costs, but not all the solvent can be recovered. Its convenience is related to the trade-off between the solvent cost and the savings in the capital costs achieved. The two-column configurations with a divided wall column represent an excellent alternative for bioethanol production because their performances are not limited by the solvent recovery.

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Modeling a non-equilibrium distillation stage using irreversible thermodynamics

Mendoza

Kjelstrup

2011

Chemical Engineering Science

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Entropy Production Analysis in Extractive Distillation Using Non-Equilibrium Thermodynamics and a Rate Based Model

Cited by 3 publications

References 8 publications

Entropy Flow and Energy Efficiency Analysis of Extractive Distillation with a Heavy Entrainer

Entropy Flow and Energy Efficiency Analysis of Extractive Distillation with a Heavy Entrainer

Optimal Synthesis of Distillation Systems for Bioethanol Separation. Part 2. Extractive Distillation with Complex Columns

Modeling a non-equilibrium distillation stage using irreversible thermodynamics

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