Ionic Liquids in Extractive Distillation of Ethanol/Water: From Laboratory to Pilot Plant

Meindersma, G.W.; Quijada‐Maldonado, E.; Aelmans, T.A.M.; Gutiérrez, Jenny; Haan, de A.B.

doi:10.1021/bk-2012-1117.ch011

Cited by 25 publications

(21 citation statements)

References 41 publications

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“…Reproduced from Ref. , with permission from American Chemical Society. (c) Two flash drums for IL recovery: flash drum 1 at mild vacuum, flash drum 2 at deep vacuum.…”

Section: Process Simulation and Optimizationmentioning

confidence: 99%

“…However, they also found that heat integration measures have almost no influence on the reduction of the overall heat duty. On the contrary, Meindersma et al noted that if no heat integration measure is adopted, the extractive distillation process with IL as entrainer will consume more energy than the conventional process. This may indicate the importance of heat integration when recovering IL from the volatile components.…”

Section: Process Simulation and Optimizationmentioning

confidence: 99%

“…Therefore, it is necessary to identify the general relationship between the molecular structures of ILs and separation performance (e.g., selectivity and solvent capacity) by the combination of predictive thermodynamic models and experimental data measured by different research groups. Second, Meindersma et al reported that a pilot plant has been established for the separation of ethanol and water by extractive distillation with ILs. This is a significant improvement for the traditional process using the benchmark solvent ethylene glycol (EG) as entrainer, with the result that energy consumption decreased by 16% after rational heat integration.…”

Section: Introductionmentioning

confidence: 99%

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Extractive distillation with ionic liquids: A review

et al. 2014

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Extractive distillation is commonly used for the separation of azeotropic or close-boiling mixtures in the chemical industry. During the past decade, the use of ionic liquids (ILs) as entrainers has received considerable attention due to their unique advantages when applied in extractive distillation. This work is devoted to providing an easy-to-read and comprehensive review on the recent progress made by chemical engineers, focusing on the issues of predictive thermodynamic models, structure-property relations, separation mechanisms, and process simulation and optimization. This review spans from the molecular level to the industrial scale, to provide a theoretical insight into the molecular interactions between ILs and the components to be separated. Moreover, a comprehensive database on the vapor-liquid equilibria (VLE) and activity coefficients at infinite dilution concerning ILs is provided as Supporting Information. Concluding remarks are made on the unsolved scientific issues with respect to this promising special distillation technology.

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“…Reproduced from Ref. , with permission from American Chemical Society. (c) Two flash drums for IL recovery: flash drum 1 at mild vacuum, flash drum 2 at deep vacuum.…”

Section: Process Simulation and Optimizationmentioning

confidence: 99%

Section: Process Simulation and Optimizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Extractive distillation with ionic liquids: A review

et al. 2014

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“…As a type of green solvent, ILs have attracted attention because of the important roles that they have played in areas of chemical research. However, most studies on ILs as separating mixtures focus on the vapor–liquid equilibrium (VLE) or solubility experiments . In 2003, Lei and his co‐workers proposed ionic liquids (ILs) as entrainers for extractive distillation for the first time, and they investigated the separation of a binary azeotrope of cyclohexane and toluene using [bmim][AlCl 4 ], [bmim][BF 4 ], and [bmim][PF 6 ] as the solvents.…”

Section: Introductionmentioning

confidence: 99%

“…However, most studies on ILs as separating mixtures focus on the vapor-liquid equilibrium (VLE) or solubility experiments. 13,14 In 2003, Lei 15 and his co-workers proposed ionic liquids (ILs) as entrainers for extractive distillation for the first time, and they investigated the separation of a binary azeotrope of cyclohexane and toluene using [ 16 which was the first English book written by Chinese authors in the field of chemical engineering. Then, a large number of researchers began using ionic liquids as alternative solvents in extractive distillation processes.…”

Section: Introductionmentioning

confidence: 99%

Process design of carbon dioxide and ethane separation using ionic liquid by extractive distillation

Zhu

Geng

et al. 2017

J of Chemical Tech & Biotech

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BACKGROUND Carbon dioxide and ethane easily form a binary azeotrope under liquefied conditions. An extractive distillation process for the separation of carbon dioxide and ethane using the ionic liquids [bmim][Tf2N], [emim][Tf2N] and [emim][EtSO4] as solvents was explored. The thermodynamic and physical property parameters of each ionic liquid and their thermo‐physical properties that correlated with the experimental data were used to create the ionic liquid components and conduct the process simulation. RESULT Based on the analysis of its physical properties and relative volatilities, [emim][Tf2N] is the best option as a solvent for extractive distillation separation compared with other ionic liquids. Based on the sensitivity analysis optimization procedure, the minimum total annual cost, carbon dioxide emissions and thermodynamic efficiency were calculated. Compared with traditional extraction distillation, the total annual cost and carbon dioxide emissions of the process using [emim][Tf2N] as a solvent decreased by 62% and 31%, respectively. The thermodynamic efficiency (η) of the electricity generated from hydropower increase by 0.7%. CONCLUSION The results show that an ionic liquid extractive distillation process using an ionic liquid as the entrainer performs better than a process using traditional organic solvents in terms of economics. Due to the non‐volatility of ionic liquids, a flash tank was used instead of a solvent recovery column to efficiently realize solvent recovery. © 2017 Society of Chemical Industry

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Extractive distillation with the mixture of ionic liquid and solid inorganic salt as entrainers

Lei

Dai

et al. 2014

AIChE Journal

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The use of the mixture of ionic liquid (IL) and solid inorganic salt in place of the single IL as entrainers for extractive distillation, which integrates the advantages of a liquid solvent, that is, IL (easy operation and nonvolatility) and a solid salt (high separation ability) has been proposed in this work. The vapor-liquid equilibrium experiments indicated that the combination of [EMIM]2 and KAc is the most promising for the separation of ethanol and water among all of the entrainers investigated. Based on the thermodynamic study, the conceptual process design was developed to evaluate the competitiveness of the suggested entrainers for the separation of ethanol and water. It was determined that the overall heat duty on reboilers in the extractive distillation process using the new mixed entrainers decreases 19.04% compared with the benchmark entrainer [EMIM]. Moreover, the density functional theory and COSMO-RS model were used to achieve theoretical insights at the molecular level.

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Ionic Liquids in Extractive Distillation of Ethanol/Water: From Laboratory to Pilot Plant

Cited by 25 publications

References 41 publications

Extractive distillation with ionic liquids: A review

Extractive distillation with ionic liquids: A review

Process design of carbon dioxide and ethane separation using ionic liquid by extractive distillation

Extractive distillation with the mixture of ionic liquid and solid inorganic salt as entrainers

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