Modeling a non-equilibrium distillation stage using irreversible thermodynamics

Mendoza, D.F.; Kjelstrup, Signe

doi:10.1016/j.ces.2011.03.023

Cited by 10 publications

(2 citation statements)

References 26 publications

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“…There is widespread research devoted to the problems of optimal organization of distillation (see [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20], etc.). Often (see [1], p. 540), "the calculation methods are based on phase equilibrium diagrams and reversible process parameters while introducing empirical corrections" and rules such as (see [2], p. 289): "The most volatile component must be separated first" or "The component with the highest concentration must be separated first".…”

Section: Introductionmentioning

confidence: 99%

Entropic Balance Conditions and Optimization of Distillation Column System

Балунов

Сукин

Цирлин

2021

Entropy

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The paper considers the limitation problem of the distillation column systems separating multicomponent mixtures with serial and parallel structures. The solution takes into account the irreversibility of processes. Using entropic balance conditions, the dependence of load on heat consumption is obtained for a binary distillation column. This dependence is parameterized through two characteristic coefficients–reversible efficiency and irreversibility factor. This dependence was used to solve problems of distribution of heat and raw material fluxes in parallel column structure and selection of optimal separation order in serial structure. The obtained results make it possible to estimate the minimum heat consumption for the separation of a given flow of raw materials, the maximum productivity, and efficiency of the system.

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Section: Introductionmentioning

confidence: 99%

Entropic Balance Conditions and Optimization of Distillation Column System

Балунов

Сукин

Цирлин

2021

Entropy

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“…In a relatively recent paper, van der Ham and Bock and Kjelstrup [28] have presented a model for coupled transfer of mass and thermal energy in the vaporliquid region of a nitrogen-oxygen mixture. This study served as a basis to incorporate mass-heat transfer coupling to model a nonequilibrium distillation stage [29].…”

Section: Introductionmentioning

confidence: 99%

On Entropy Generation and the Effect of Heat and Mass Transfer Coupling in a Distillation Process

Burgos-Madrigal

Mendoza

Haro

2018

Journal of Non-Equilibrium Thermodynamics

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Abstract:The entropy production rates as obtained from the exergy analysis, entropy balance and the nonequilibrium thermodynamics approach are compared for two distillation columns. The first case is a depropanizer column involving a mixture of ethane, propane, n-butane and n-pentane. The other is a weighed sample of Mexican crude oil distilled with a pilot scale fractionating column. The composition, temperature and flow profiles, for a given duty and operating conditions in each column, are obtained with the Aspen Plus V8.4 software by using the RateFrac model with a rate-based nonequilibrium column. For the depropanizer column the highest entropy production rate is found in the central trays where most of the mass transfer occurs, while in the second column the highest values correspond to the first three stages (where the vapor mixture is in contact with the cold liquid reflux), and to the last three stages (where the highest temperatures take place). The importance of the explicit inclusion of thermal diffusion in these processes is evaluated. In the depropanizer column, the effect of the coupling between heat and mass transfer is found to be negligible, while for the fractionating column it becomes appreciable.

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A reduced order rate based model for distillation in packed columns: Dynamic simulation and the differentiation index problem

Bonilla

Logist

Degrève

et al. 2012

Chemical Engineering Science

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This paper presents a rigorous dynamic rate based model suitable for simulation of distillation of mixtures in packed columns. The model equations are described in detail considering structure exploitation at simulation level in order to alleviate the large number of states involved in the model description. Moreover, this kind of model leads to differential-algebraic equations with a differentiation index higher than one. Here this issue is analyzed and a differentiation-index reduction procedure based on the incidence of model states in the Jacobian and the properties of the model dynamics is proposed. This procedure allows for a simplified index-1 model with a reduced stiffness so that dynamic simulation can be performed with off-the-shelf solvers.

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Modeling a non-equilibrium distillation stage using irreversible thermodynamics

Cited by 10 publications

References 26 publications

Entropic Balance Conditions and Optimization of Distillation Column System

Entropic Balance Conditions and Optimization of Distillation Column System

On Entropy Generation and the Effect of Heat and Mass Transfer Coupling in a Distillation Process

A reduced order rate based model for distillation in packed columns: Dynamic simulation and the differentiation index problem

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