Energy-efficient extractive distillation combined with heat-integrated and intermediate reboilers for separating acetonitrile/isopropanol/water mixture

Li, Yudong; Ye, Qing; Wang, Naigen; Chen, Lijuan; Zhang, Haoxiang; Xu, Yinggui

doi:10.1016/j.seppur.2021.118343

Cited by 60 publications

(14 citation statements)

References 46 publications

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“… where M coal represents the quality of standard coal and a GAS (kg/h) represents the emission conversion coefficient of standard coal, where a CO 2 is 2.493, a SO 2 is 0.075, and a NOX is 0.0375. M coal can be calculated by eq where Q represents the thermal load of the heating equipment, N represents the running time, η coal,trans (0.9) is the isentropic efficiency, and Q standard (29307.6 kJ/kg) is the calorific value of the standard coal.…”

Section: Methodsmentioning

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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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%

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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“…A comprehensive and systematic review of extractive distillation for process design, operation, optimization, and control was contributed by Gerbaud et al The design of an energy-efficient extractive distillation process was one of the hottest research areas of azeotrope separation. Energy-saving techniques have been widely used in extractive distillation processes, such as heat integration side-stream extractive distillation, extractive distillation with an intermediate boiling solvent, reduced pressure extractive distillation with heat integration, heat integration combined with intermediate reboilers, heat integration dividing a wall column, mixed solvents combined with dividing a wall column, steam recompression and side-line reboiler, heat integration and mechanical heat pump, thermally coupled method, − and so forth. The vapor recompression heat pump method had been well promoted in pressure-swing distillation processes as well .…”

Section: Introductionmentioning

confidence: 99%

Multilevel Comparison of Ionic Liquid Separation of a Methanol/Methyl Acetate/Water Mixture

Guo

Liu

et al. 2023

Ind. Eng. Chem. Res.

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This paper aimed to investigate whether ionic liquids (ILs) with excellent phase equilibrium abilities were also economically superior at the process level. Comprehensive comparisons of seven different types of ILs for the separation of a methanol/methyl acetate/water mixture were performed from molecular, phase equilibrium, to the process level. The validated NRTL model was used for phase equilibria and process simulation and COSMO-based sigma profiles for mechanism analysis. Energy consumption, energy cost, and total annual cost (TAC) were carried out to quantify process performances. Heat pump-assisted IL-extractive distillation processes were proposed. The results indicated that the heat pump-assisted schemes saved the TAC up to 51.2%. The process economic performances of 1-ethyl-3-methylimidazolium acetate ([EMIM][Ac]), 1-hexyl-3-methylimidazolium chloride, 1-ethyl-3-methylimidazolium methylsulfate, and 1-ethyl-3methylimidazolium thiocyanate were equally well, while that of 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide was the worst at all levels. The TAC savings of the [EMIM][Ac] process ranged from 3.4 to 48.2% compared with the latter six ILs. The order of performance of ILs in terms of relative volatility or binary phase diagram was nearly the same as the process level, while using the minimum amount of ILs required to break azeotropes as an indicator was of a different order.

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“…However, it is hard to separate the mixture of 1-pentanol and PX because of the azeotropic phenomenon. Specialized separation techniques for industrial applications include cryogenic crystallization, pressure-swing distillation, − extractive distillation, − azeotropic distillation, , and membrane separation . Near-boiling or azeotropic systems are often separated by extractive distillation, and the choice of solvent determines the separation efficiency. − In extractive distillation, the selection of the best solvent can not only improve the purity of the product but also reduce the energy consumption of the system and save cost.…”

Section: Introductionmentioning

confidence: 99%

Isobaric Vapor–Liquid Equilibrium of Binary Systems of 1-Pentanol + Butyl Butyrate, 1-Pentanol + N-Formylmorpholine, and p-Xylene + Butyl Butyrate at 101.3 kPa

et al. 2021

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In this work, the effects of N-methyl pyrrolidone, N,N-dimethylformamide, cyclohexanol, butyl butyrate, and N-formylmorpholine on the separation efficiency of a p-xylene and 1-pentanol azeotropic system are investigated, and the best solvent is selected from these solvents. The vapor–liquid equilibrium data of binary systems of 1-pentanol + butyl butyrate, 1-pentanol + N-formylmorpholine, and p-xylene + butyl butyrate are measured using a modified Rose-type circulating still under 101.3 kPa. In order to check the thermodynamic consistency of the experimental vapor–liquid equilibrium data, the Herington and Van Ness methods are used. In addition, the nonrandom two-liquid, universal quasichemical, and Wilson models are used to correlate the experimental data of binary systems, and the interaction parameters of binary systems are obtained.

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Energy-efficient extractive distillation combined with heat-integrated and intermediate reboilers for separating acetonitrile/isopropanol/water mixture

Cited by 60 publications

References 46 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

Multilevel Comparison of Ionic Liquid Separation of a Methanol/Methyl Acetate/Water Mixture

Isobaric Vapor–Liquid Equilibrium of Binary Systems of 1-Pentanol + Butyl Butyrate, 1-Pentanol + N-Formylmorpholine, and p-Xylene + Butyl Butyrate at 101.3 kPa

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