Choice of suitable entrainer in heteroazeotropic batch distillation system for acetic acid dehydration

Huang, Han Jie; Chien, I‐Lung

doi:10.1016/j.jcice.2008.04.002

Cited by 20 publications

(9 citation statements)

References 22 publications

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“…Nonlinearity is not only displayed by the real systems but also can be found in the first-principle models of these systems. Such systems, although conveniently simulated by commercially available simulators such as Aspen HYSYS, Aspen Plus and MATLAB, are found to be challenging for linear control. − Since these simulations are able to demonstrate the dynamic behavior of the plant, they are widely used in chemical engineering applications for conceptualisation, analysis, identification, and control. − …”

Section: Introductionmentioning

confidence: 99%

Consistent and Effective Nonlinearity Index and its Application on Model Predictive Controller Performance Deterioration

Uddin

Tufa

Maulud

2018

Ind. Eng. Chem. Res.

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Many control-relevant systems present the challenges of nonlinearity, directionality and ill-conditioning for the control systems, and exhibit poor controller performance. This study proposes a Nonlinearity Index to quantify the extent of nonlinearity of such systems. A dynamic nonlinear model of a pilot-scale distillation column operating near the azeotropic region was simulated using Aspen Plus Dynamics. A comparison of the results is made with the Nonlinearity Measure proposed by Du et al. Results show that a significant increase is exhibited in the proposed Nonlinearity Index values of the system as the system moves toward the azeotropic region. Prediction errors of the linear models are also shown to be correlated to the proposed index. Therefore, the proposed Nonlinearity Index is consistent with the existing indicators of nonlinearity, and thus its measurements of system nonlinearity are reliable. Controller performance for the system at higher values of the proposed index further presents its efficacy.

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Section: Introductionmentioning

confidence: 99%

Consistent and Effective Nonlinearity Index and its Application on Model Predictive Controller Performance Deterioration

Uddin

Tufa

Maulud

2018

Ind. Eng. Chem. Res.

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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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“…Commonly known methods for removing water from acetic acid are conventional distillation, azeotropic distillation, extraction, adsorption, and so forth. Liquid–liquid extraction followed by heteroazeotropic distillation is considered to be one of the best energy-saving processes. − This method is a typical solvent-based separation process, of which the most important variable in the design is the choice of solvent. From an energy-saving point of view, Kürüm and Fonyo evaluated more than 30 types of possible solvents for acetic acid purification by using extraction followed by azeotropic distillation method and concluded that methyl tert -butyl ether (MTBE) is a promising entrainer.…”

Section: Introductionmentioning

confidence: 99%

Liquid–Liquid Equilibria of Water + Acetic Acid + Cyclopentyl Methyl Ether (CPME) System at Different Temperatures

Zhang

Liu

et al. 2012

J. Chem. Eng. Data

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Tie-line data of the ternary system water + acetic acid + cyclopentyl methyl ether (CPME) at (293.15, 298.15, 303.15, 308.15, 313.15, and 318.15) K are reported. The reliability of the tie-line data was confirmed by using Othmer−Tobias and Hand equations. Distribution coefficients and separation factors were evaluated from the liquid−liquid equilibria (LLE) data. Moreover, the solvent capability of CPME and methyl tert-butyl ether was compared.

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Choice of suitable entrainer in heteroazeotropic batch distillation system for acetic acid dehydration

Cited by 20 publications

References 22 publications

Consistent and Effective Nonlinearity Index and its Application on Model Predictive Controller Performance Deterioration

Consistent and Effective Nonlinearity Index and its Application on Model Predictive Controller Performance Deterioration

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

Liquid–Liquid Equilibria of Water + Acetic Acid + Cyclopentyl Methyl Ether (CPME) System at Different Temperatures

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