Vapor−Liquid Equilibrium in Extractive Distillation of the Acetone/Methanol System Using Water as Entrainer and Pressure Reduction

Botía, Diana C.; Riveros, Diana C.; Ortiz, Pablo; Gil, Iván D.; Sánchez, Oscar F.

doi:10.1021/ie901702h

Cited by 11 publications

(8 citation statements)

References 18 publications

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“…The vapor–liquid equilibrium (VLE) of the system acetone–methanol with water is described with the UNIQUAC thermodynamic model with the Aspen Plus built-in binary parameters while the ideal vapor phase is assumed. The reliability of the VLE model has been assessed by Botia et al using vapor–liquid equilibrium experimental data under atmospheric and vacuum pressure. Notice that the tray number is counted from top to bottom of the column, and the condenser is considered as the first tray.…”

Section: Background Method and Objective Functionmentioning

confidence: 99%

Investigation of Separation Efficiency Indicator for the Optimization of the Acetone–Methanol Extractive Distillation with Water

You

Rodríguez-Donis

Gerbaud

2015

Ind. Eng. Chem. Res.

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A multiobjective genetic algorithm optimization of the extractive distillation process of acetone−methanol minimum azeotropic mixture with heavy entrainer water is investigated. The process includes the extractive and entrainer regeneration columns, and the optimization minimizes the energy cost objective function (OF) and total annual cost (TAC) and maximizes efficiency indicators E ext and e ext that describe the ability of the extractive section to discriminate the product between the top and the bottom of that section. Earlier work (You et al. Ind. Eng. Chem. Res. 2015, 54, 491) found that improvement of some designs in the literature led to an increase in those indicators. A two-step optimization strategy for extractive distillation is conducted to find suitable values of the entrainer feed flow rate, entrainer and azeotropic mixture feed locations, total number of trays, two reflux ratios, and two distillates in both the extractive column and the entrainer regeneration column. The first step relies upon the use of a nonsorted genetic algorithm (NSGA) with the four aforementioned criteria. Second, the best design taken from the GA Pareto front is further optimized focusing on decreasing the energy cost by using a sequential quadratic programming (SQP) method. In this way, the most suitable design with optimal efficiency indicators, low energy consumption, and low cost are obtained. Analyzed with respect to thermodynamic insights underlying the extractive section composition profile map, the Pareto front results show that there is maximum E ext at a given reflux ratio, and there is minimum reflux ratio for a given E ext. There is an optimal efficiency indicator E ext,opt which corresponds to the minimum TAC taken as the best design. In other words, E ext,opt can be a criterion for the comparison between different designs for the same separating system. A SQP-based design is only <1% better in TAC than the best NSGA design, showing that this later method is able to find a consistent design for the extractive process concerning the 1.0-1a class mixture.

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Section: Background Method and Objective Functionmentioning

confidence: 99%

Investigation of Separation Efficiency Indicator for the Optimization of the Acetone–Methanol Extractive Distillation with Water

You

Rodríguez-Donis

Gerbaud

2015

Ind. Eng. Chem. Res.

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“…The VLE data are obtained by using a modified equilibrium still similar to Othmer still , with some modifications described elsewhere. − The modified equilibrium still and experimental procedure are described in detail in the previous work . This still can prevent the occurrence of violent boiling efficiently.…”

Section: Methodsmentioning

confidence: 99%

Isobaric Vapor–Liquid Equilibium for the Binary Systems of Methyl Formate with o-Xylene, m-Xylene, p-Xylene, and Ethylbenzene at 101.33 kPa

2012

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Isobaric vapor−liquid equilibrium (VLE) data are reported for binary mixtures of methyl formate + o-xylene, methyl formate + m-xylene, methyl formate + p-xylene, and methyl formate + ethylbenzene at 101.33 kPa. The data are obtained using a vapor recirculating type (modified Othmer's) equilibrium still. All of the binary systems show positive deviation from ideality. None of the systems form an azeotrope. The VLE data for these binary systems are checked to meet rigorous thermodynamic consistency by the Herington method and the point-to-point test of the Fredenslund method. The experimental VLE data are well-correlated by the nonrandom two-liquid (NRTL), universal quasichemical activity coefficient (UNIQUAC), and Wilson equations.

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“…In order to model the vapor-liquid equilibrium for this mixture, the UNIQUAC model has been used [28]. It has been reported that the UNIQUAC model fits with vaporliquid equilibrium experimental data for the system acetone/ methanol/water [29]. In Fig.…”

Section: Extractive Distillation Sequencesmentioning

confidence: 99%

Design of non-equilibrium stage separation systems by a stochastic optimization approach for a class of mixtures

Gómez‐Castro¹,

Segovia‐Hernández²,

Hernández³

et al. 2015

Chemical Engineering and Processing: Process Intensification

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Vapor−Liquid Equilibrium in Extractive Distillation of the Acetone/Methanol System Using Water as Entrainer and Pressure Reduction

Cited by 11 publications

References 18 publications

Investigation of Separation Efficiency Indicator for the Optimization of the Acetone–Methanol Extractive Distillation with Water

Investigation of Separation Efficiency Indicator for the Optimization of the Acetone–Methanol Extractive Distillation with Water

Isobaric Vapor–Liquid Equilibium for the Binary Systems of Methyl Formate with o-Xylene, m-Xylene, p-Xylene, and Ethylbenzene at 101.33 kPa

Design of non-equilibrium stage separation systems by a stochastic optimization approach for a class of mixtures

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