Entrainer Selection and Systematic Design of Heterogeneous Azeotropic Distillation Flowsheets

Moussa, Amgad; Jiménez, Laureano

doi:10.1021/ie051196k

Cited by 9 publications

(5 citation statements)

References 38 publications

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“…The solvent used in the extractor is not pure, but it is recycled DCM [30]. The system design has been carried out based on the following considerations.…”

Section: -Extraction With Dichloromethane (Dcm)mentioning

confidence: 99%

Alternative integrated distillation strategies for the purification of acetonitrile from ethanol ammoxidation

Tripodi

Manzini

Compagnoni

et al. 2018

Journal of Industrial and Engineering Chemistry

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Acetonitrile is increasingly used as solvent for the fine chemicals and pharmaceutical industries. Ethanol ammoxidation has been proposed as an alternative way for its production starting from a renewable source. This process leads to a complex mixture of products, which needs an optimized separation train to maximize the recovery and purity of acetonitrile. Pressure swing distillation, operated at 7 and 10 bar, has been compared as for feasibility and economic impact with the extractive distillation using dichloromethane as entrainer. The pressure swing option led to higher CH3CN recovery (95.5%) with respect to extractive distillation (92.1%), irrespectively from the operating pressure. Furthermore, the pressure swing option allowed to tune more easily product purity by adding or removing trays in the stripping section of the high pressure column, leaving water as the only impurity. Similar results were obtained when operating the pressure swing between 1 and 7 bar or 1 and 10 bar, but the operation at 10 bar was characterised by lower installation and operating costs, thus it was considered as optimal. The same economical evaluation was carried out for the

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“…The solvent used in the extractor is not pure, but it is recycled DCM [30]. The system design has been carried out based on the following considerations.…”

Section: -Extraction With Dichloromethane (Dcm)mentioning

confidence: 99%

Alternative integrated distillation strategies for the purification of acetonitrile from ethanol ammoxidation

Tripodi

Manzini

Compagnoni

et al. 2018

Journal of Industrial and Engineering Chemistry

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“…In that regard, it is important to point out that the choice of the entrainer to be added is a key aspect: various factors, including safety, environmental effects, corrosion, availability and price, need to be taken into consideration. In addition, major concerns are represented by the analysis of the structure of the residue curves and distillation line maps associated with the resulting mixtures [12,13].…”

Section: Introductionmentioning

confidence: 99%

Separation of the Mixture 2-Propanol + Water by Heterogeneous Azeotropic Distillation with Isooctane as an Entrainer

et al. 2021

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Advanced processes, which are alternatives to ordinary distillation, are essential to dehydrate azeotropic alcoholic mixtures for biofuel production. In that regard, this work focuses on the analysis of heterogeneous azeotropic distillation for the separation of a 2-propanol + water mixture in order to recover the alcohol with a sufficiently low water content. By comparing the performances of various entrainers on the basis of ternary maps, isooctane was selected for further process analysis. An advantage it poses is related to the fact that traces of it within the recovered dehydrated alcohol are highly welcome with a view to its subsequent use as a fuel. Aspen Plus® V11 software was employed for the simulation of the process, thus filling the gap existing in the literature due to the lack of studies on the process analysis of the heterogeneous azeotropic distillation of the 2-propanol + water system using isooctane as an entrainer.

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“…An HAc–water mixture is very difficult to separate because of the low relative volatility of HAc–water mixtures with high water concentrations . Traditionally, heterogeneous azeotropic distillation with an entrainer has been widely applied for HAc dehydration. − Acetic esters, such as isobutyl acetate (IBA), n -propyl acetate (NPA), and ethyl acetate (EA), are most commonly used as the entrainers for heterogeneous azeotropic distillation. ,− However, the heterogeneous azeotropic distillation is energy intensive to generate high-purity HAc. Moreover, this technique involves the introduction of a third component into the process to break the azeotrope.…”

Section: Introductionmentioning

confidence: 99%

Process Design and Optimization of an Acetic Acid Recovery System in Terephthalic Acid Production via Hybrid Extraction–Distillation Using a Novel Mixed Solvent

Harvianto

Kang²,

Lee

2017

Ind. Eng. Chem. Res.

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An extraction and distillation hybrid process using a novel mixed solvent was proposed for enhancing acetic acid recovery during terephthalic acid production. Feasible hybrid extraction− distillation schemes were designed, simulated, and optimized for two mixed solvents, p-xylene + methyl acetate, and p-xylene + ethyl acetate, based on liquid−liquid equilibrium data for a quaternary system containing methyl acetate or ethyl acetate with p-xylene, acetic acid, and water. A hybrid process using the p-xylene + methyl acetate mixed solvent was found to generate the desired purity of acetic acid with a lower energy consumption and higher product yield than conventional extraction processes. Results showed that the proposed hybrid extraction−distillation process improves the process economics remarkably: the hybrid process using the p-xylene + methyl acetate and p-xylene + ethyl acetate mixed solvent reduced a total annual cost by 14% and 6%, respectively, compared with the conventional hybrid process using the ethyl acetate single solvent. With the important advantage of p-xylene and methyl acetate as internally existing components, the proposed mixed solvent is promising for safe and cost-effective recovery of acetic acid, particularly during terephthalic acid production.

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Entrainer Selection and Systematic Design of Heterogeneous Azeotropic Distillation Flowsheets

Cited by 9 publications

References 38 publications

Alternative integrated distillation strategies for the purification of acetonitrile from ethanol ammoxidation

Alternative integrated distillation strategies for the purification of acetonitrile from ethanol ammoxidation

Separation of the Mixture 2-Propanol + Water by Heterogeneous Azeotropic Distillation with Isooctane as an Entrainer

Process Design and Optimization of an Acetic Acid Recovery System in Terephthalic Acid Production via Hybrid Extraction–Distillation Using a Novel Mixed Solvent

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