Pressure swing distillation of azeotropic mixture – A simulation study

El presente artículo tiene como propósito mostrar la predicción del equilibrio vapor-líquido de una mezcla no ideal mediante modelos termodinámicos como lo es la ecuación de Peng-Robinson para el cálculo de los coeficientes de fugacidades de los componentes en estado gaseoso, y el modelo de Van Laar para hallar los coeficientes de actividad de los componentes en estado líquido. Los resultados se validan mediante el uso del simulador comercial Aspen Plus y la herramienta online “VLE-Calc”, obteniendo resultados similares con los valores experimentales de la mezcla binaria.

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“…El coeficiente de fugacidad de los componentes en solución fue calculado a partir de la ecuación Peng Robinson (16) ln…”

Section: Consideraciones Y Algoritmo Para La Presión De Burbujaunclassified

“…En el cálculo de algunos equilibrios de fases es común encontrar sistemas que tengan puntos azeotrópicos que dificultan la separación de mezclas multicomponentes [14]- [16].…”

Section: Introductionunclassified

Predicción del equilibrio vapor-líquido de la mezcla acetato de etilo-etanol usando la ecuación de estado de Peng Robinson

Silva¹,

Botett-Cervantes²,

Prieto-Jiménez³

2020

Rev. UIS ing.

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“…0.2 or up to 20 times increase, but, an even greater jump could be stated for linalool oxide, as approx for a hundred times. Iqbal and Ahmad, 6 detailed the professional software designed (HYSYS) optimal operation results, whereas, defined the optimal reflux ratio for HP (column) as greater than for LP (column) for approx. 13.5%, whereas, the ratio of distillate to feed flowrate (like "liquid ratio for batch distillation"), greater for even 43.75%.…”

Section: Introductionmentioning

confidence: 99%

Pressure-Driven Batch Distillation Optimal Control for Ethanol-Water Separation

Stojkovic¹

2023

Fine Chemical Engineering

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Ethanol-water separation by pressure-swing batch distillation in a double-batch rectifier system is a process under investigation. In this work, a complete global solution to the optimal control problem in the form of a sequential synthesis of controlled trajectories is derived. During this study, the optimal reflux strategy through cyclic operation was extended to the separation of a second non-ideal minimum boiling azeotrope of industrial importance. The optimal cyclic reflux ratio operating policy, brought significant reductions in time duration, going up to even 50%. Consequently even more significant reductions in energy expenditure, since the derived discontinuous energy function tends to show cyclic “behavior” as well. Lastly, the proposed strategy provides the possibility to highly recover the desired product even within a single period, and finally maybe even the most importantly, flexibility in operating different units within the time frame.

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“…Moreover, in a case scenario involving azeotropes, the situation is more difficult to deal with. Sometimes, the separation limitations due to the existence of azeotropes can be overcome without addition of a third substance, which facilitates the process and makes it less hazardous . In homogeneous azeotropes, the separation without the need for solvent is feasible if a change in pressure yields a shift in the pinch point composition.…”

Section: Introductionmentioning

confidence: 99%

Achieving a better understanding of binary azeotropic mixtures distillation through Aspen Plus process simulations

Roman

García‐Morales

2019

Comp Applic In Engineering

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Mass transfer operations are at the heart of every chemical engineering curriculum, as they are the basis of separation procedures extensively used in the chemical industry. Distillation, which involves mass transfer between vapor and liquid phases, is, by far, the most extended separation practice. However, the presence of azeotropes in most of the mixtures with industrial interest complicates the process analysis due to tedious and complex calculations, even in the simplest case of binary mixtures. Moreover, the need for recycle streams makes convergence and variables specification very difficult as compared with the separation of nonazeotropic mixtures. Initial training in process simulators results fundamentally in high‐quality chemical engineering teaching programs. It yields a better understanding of enhanced distillation and entails the use of professional tools highly demanded by employers. This paper reports how the use of the commercial simulator Aspen Plus can help students explore azeotropic distillation by their own, and thus enables looking into aspects which are beyond the scope of problems solved by hand.

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Pressure swing distillation of azeotropic mixture – A simulation study

Cited by 24 publications

References 5 publications

Predicción del equilibrio vapor-líquido de la mezcla acetato de etilo-etanol usando la ecuación de estado de Peng Robinson

Predicción del equilibrio vapor-líquido de la mezcla acetato de etilo-etanol usando la ecuación de estado de Peng Robinson

Pressure-Driven Batch Distillation Optimal Control for Ethanol-Water Separation

Achieving a better understanding of binary azeotropic mixtures distillation through Aspen Plus process simulations

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