Multi-objective optimization and control strategy for extractive distillation with dividing-wall column/pervaporation for separation of ternary azeotropes based on mechanism analysis

Zhang, Hongru; Wang, Shuai; Tang, Jingling; Li, Ningning; Li, Yanan; Cui, Peizhe; Wang, Yinglong; Shi-qing, Zheng; Zhu, Zhaoyou; Ma, Yixin

doi:10.1016/j.energy.2021.120774

Cited by 51 publications

(47 citation statements)

References 33 publications

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“…We obtained the phase equilibrium data of the azeotrope under different molar ratios by changing the composition of the azeotrope, and the phase equilibrium data of the azeotrope under these 11 entrainers were calculated by the same method. Then, the relative volatility was calculated by the following equation, eq where y A and y B represent the mole fractions of the two components in the vapor phase and x A and x B represent the corresponding liquid-phase compositions.…”

Section: Methodsmentioning

confidence: 99%

“…The selection of a suitable entrainer is not only related to the successful separation of the azeotrope but also closely related to the economy and environmental impact of the process. In general, the separation effect of entrainers on an azeotropic system can be judged according to the relative volatility . In recent years, with the development of quantum chemistry and molecular dynamics (MD) simulations, many researchers have begun to use software to assist in selection and mechanism analysis. − Chen et al used MD simulations to analyze the interaction between an ionic liquid mixed entrainer and n -heptane/ethyl acetate and verified the influence of molecular interactions on the separation effect .…”

Section: Introductionmentioning

confidence: 99%

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Effect of Entrainer Thermodynamic Properties on the Separation of Ternary Mixtures Containing Two Minimum Boiling Azeotropes by Extractive Distillation

Dai

Zhou

Chu

et al. 2022

Ind. Eng. Chem. Res.

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Generally, the selection of an entrainer in extractive distillation depends on relative volatility, but our previous research shows that relying on relative volatility alone may not achieve the best economic and environmental benefits in the process. In this work, the effects of different entrainers on the separation process of ternary mixtures containing two minimum boiling azeotropes by extractive distillation were studied using a dichloromethane (DCM)/methanol (MeOH)/water system as an example. Taking the gas emission and total annual cost as objectives, the separation processes of eight entrainers in the DCM/MeOH/water system were optimized and compared by a multiobjective optimization method. The optimization results show that 1,3-propanediol had the best economic and environmental benefits, although its relative volatility was not the best. The limitations of screening entrainers by relying on relative volatility alone were demonstrated. To achieve optimal economic and environmental benefits, entrainer screening needs to consider the relative volatility, thermodynamic properties of the entrainers, and possible thermal integration schemes. This work provides a reference for the screening of entrainers and process design in extractive distillation processes.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Entrainer Thermodynamic Properties on the Separation of Ternary Mixtures Containing Two Minimum Boiling Azeotropes by Extractive Distillation

Dai

Zhou

Chu

et al. 2022

Ind. Eng. Chem. Res.

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“…In addition to the abovementioned issues, the optimization method is crucial for obtaining the optimal design. The optimization methods include SQP, 18 the relative gain array, 23 the particle swarm algorithm, 24 and the genetic algorithm for nonazeotropic mixture distillation, 25 extractive distillation (ED), 26 and pressure-swing batch distillation. 27 All of the abovementioned ternary mixtures belong to class 3.0−2, which only accounts for 8.4% according to statistics, 28 but until now, as far as we know, only a few studies focus on class 2.0−2b, although it accounts up to 21.0% in all of the azeotropic mixtures.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to the abovementioned issues, the optimization method is crucial for obtaining the optimal design. The optimization methods include SQP, the relative gain array, the particle swarm algorithm, and the genetic algorithm for nonazeotropic mixture distillation, extractive distillation (ED), and pressure-swing batch distillation …”

Section: Introductionmentioning

confidence: 99%

Economic and Environmental Evaluation of Heat-Integrated Pressure-Swing Distillation by Multiobjective Optimization

Shi

et al. 2022

Ind. Eng. Chem. Res.

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A systematic procedure is proposed for the design of a pressure-swing distillation (PSD) process for a ternary mixture. This procedure involves thermodynamic insight, global optimization, and heat integration. The aim of thermodynamic insight is to analyze the process feasibility and find all of the possible separation sequences via residue curve maps and the distillation boundaries. The global optimization for a total of 16 variables in three columns is conducted by multiobjective genetic algorithm (MOGA) with economy and environmental impact as objectives. In heat integration, a four-step heat integration MOGA method was first proposed to optimize the heat-integrated PSD process and the optimally integrated heat duty was achieved. The separation of a methanol/tetrahydrofuran/ water ternary mixture is employed to elucidate the effectiveness of the proposed procedure. An energy-saving heat-integrated PSD process is obtained, and the total annual cost and CO 2 emissions are reduced by 22.5 and 30.4% compared with the conventional PSD process.

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“…EDWC essentially is a thermally coupled distillation, with high thermodynamic efficiency, low energy consumption and less floor space. 21 There are many industrial applications. Arsol Aromatics GmbH established an EDWC tower to recover benzene/toluene/ xylene.…”

Section: Introductionmentioning

confidence: 99%

Comparison of different extractive distillation processes for chloroform/n‐hexane separation: design and control

Zeng

Jianting²,

Zhu

et al. 2022

J of Chemical Tech & Biotech

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Background When extracting total glycosides from Panax notoginseng, a waste liquid containing chloroform and n‐hexane will be produced. These waste liquids are not separated and recycled in time, which will not only waste resources but also cause environmental pollution. Chloroform and n‐hexane form an azeotrope which cannot be separated by ordinary distillation methods. This study proposes three extractive distillation processes to separate the chloroform/n‐hexane azeotrope: conventional extractive distillation (ED), side‐stream extractive distillation (SSED) and extractive dividing wall column (EDWC). The total annual cost (TAC) and carbon dioxide (CO2) emissions of the three options were compared, and the optimal process was selected. Furthermore, this research developed dynamic control of the optimal process. Results Compared with ED, from the perspective of economic indicators, the SSED process showed 18.9% reduction in TAC yet the EDWC process showed 33.2% reduction in TAC. In terms of CO2 emission indicators, the EDWC process also is more advantageous. Three control structures thus were developed for EDWC: applying ±5% or ±10% feed flow disturbance, and feed composition disturbance. The results show that CS3 with temperature composition cascade control structure can perfectly control all disturbances. Conclusion This paper designs an economical, environmentally friendly and controllable chloroform/n‐hexane azeotropic separation process, which can provide a reference for the industrial application of chloroform/n‐hexane separation. © 2022 Society of Chemical Industry (SCI).

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Multi-objective optimization and control strategy for extractive distillation with dividing-wall column/pervaporation for separation of ternary azeotropes based on mechanism analysis

Cited by 51 publications

References 33 publications

Effect of Entrainer Thermodynamic Properties on the Separation of Ternary Mixtures Containing Two Minimum Boiling Azeotropes by Extractive Distillation

Effect of Entrainer Thermodynamic Properties on the Separation of Ternary Mixtures Containing Two Minimum Boiling Azeotropes by Extractive Distillation

Economic and Environmental Evaluation of Heat-Integrated Pressure-Swing Distillation by Multiobjective Optimization

Comparison of different extractive distillation processes for chloroform/n‐hexane separation: design and control

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