Energy-efficient extractive pressure-swing distillation for separating binary minimum azeotropic mixture dimethyl carbonate and ethanol

Yang, Ao; Sun, Shouli; Shi, Tao; Xu, Di; Ren, Jingzheng; Shen, Weifeng

doi:10.1016/j.seppur.2019.115817

Cited by 61 publications

(14 citation statements)

References 47 publications

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“…It is difficult to separate the azeotropic mixture by an ordinary distillation method to obtain high-purity components. Compared with pressure swing distillation, azeotropic distillation, membrane separation, and extractive distillation, , liquid–liquid extraction (LLE) is an effective method to separate azeotropes because it can be carried out under environmental conditions, which can greatly reduce energy consumption and environmental impact. Therefore, it is very important to choose an efficient, suitable, and highly selective solvent to ensure an economic operation. − …”

Section: Introductionmentioning

confidence: 99%

Molecular Mechanism and Extraction Performance Evaluation for Separation of Methanol and n-Hexane via Ionic Liquids as Extractant

Zhang

Chen

Shen

et al. 2020

ACS Sustainable Chem. Eng.

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Biodiesel is considered as one of the best resources to replace fossil fuels. There are a lot of mixtures of methanol and hexane in the process of biodiesel production. In this study, a green solvent ionic liquid extraction is used to separate methanol and n-hexane. The molecular dynamics method is used to study the extraction mechanism of methanol and n-hexane by ionic liquid. The extraction efficiency predicted by molecular dynamics simulation is compared with liquid–liquid extraction experimental values. The deviation between the experimental data and the simulation data is less than 8%, which shows that they have good consistency. The interaction energy, radial and spatial distribution functions, and self-diffusion coefficients are calculated based on the molecular dynamics simulation results. At the same time, anions play a vital role in the extraction process. A method for separating methanol and recovering ionic liquid using Aspen plus is proposed. The optimum operating parameters are determined. The recoveries of ionic liquid and methanol were 99.32% and 94.11%, respectively. The minimum total annual cost of the IL extraction process is 17.31% lower than that of traditional extraction process. At the same time, environmental analysis is performed. Global warming potential and eutrophic potential of the new process are 86.1% and 85% lower than those of the traditional process, respectively. The new process has good sustainable development advantages. This study provides theoretical guidance for the recycling and comprehensive utilization of methanol and n-hexane and provides a new method for the sustainable development of green chemicals.

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Section: Introductionmentioning

confidence: 99%

Molecular Mechanism and Extraction Performance Evaluation for Separation of Methanol and n-Hexane via Ionic Liquids as Extractant

Zhang

Chen

Shen

et al. 2020

ACS Sustainable Chem. Eng.

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“…The performance indicators from exergy analysis are functions of variables such as exergy of work, exergy due to heat transfer or exergy of the process stream. The calculations for exergy analysis are based on the research conducted by Yan et al (2019), Yang et al (2019b) and Yang et al (2019a). For a better understanding of this section, a systematic procedure for exergy-based indicators is presented in Fig.…”

Section: Methodsmentioning

confidence: 99%

Computer-aided simulation and exergy analysis of TiO₂ nanoparticles production via green chemistry

Meramo

Moreno-Sader

González-Delgado

2019

PeerJ

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BackgroundThe production of photocatalytic nanoparticles such as TiO2 has received increasing interest for biomedical and wastewater treatment applications. However, the conventional synthesis of such materials faces several environmental concerns.MethodsIn this work, green synthesis is addressed to prepare TiO2 nanoparticles at large scale using Lemongrass (Cymbopogon citratus) and titanium isopropoxide (TTIP). This process was designed and modeled using computer-aided process engineering (CAPE) in order to obtain the extended mass/energy balances, as well as operating parameters. Process simulation was carried out using the commercial software Aspen Plus®. In addition, energy performance of large-scale nanoparticle production was analyzed to identify alternatives for process improvement from an exergetic point of view.ResultsThe production capacity of the plant was estimated as 1,496 t/y of TiO2 nanoparticles by the conversion of 32,675 t/y lemongrass and 5,724 t/y TTIP. Hence, the overall production yield is 0.26 kg TiO2/kg TTIP. Exergy analysis reported an overall exergy efficiency of 0.27% and an exergy loss of 159,824.80 MJ/h. These results suggest that such a process requires the implementation of process improvement strategies to reach a more sustainable design from energy and thermodynamic viewpoints.

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“…34 When the intersection (x p ) closes to the key component, less entrainer is required, which leads to low energy and equipment consumption. 12 Hereby, [EMIM][Ac] is a suitable entrainer for separating TFP and water by extractive distillation.…”

Section: Conceptual Designmentioning

confidence: 99%

“…5 It is difficult to separate TFP with high purity by conventional distillation. Generally, for separating azeotropic mixtures, special separation technologies are usually considered, such as azeotropic distillation, 6 extractive distillation, [7][8][9] pressure-swing distillation, [10][11][12] and membrane technology. 13 To separate TFP from its aqueous solution, Shi et al 5,14 adopted azeotropic distillation to separate TFP and water with chloroform and p-xylene as azeotropic agents.…”

Section: Introductionmentioning

confidence: 99%

Process design, evaluation and control for separation of 2,2,3,3‐tetrafluoro‐1‐propanol and water by extractive distillation using ionic liquid 1‐ethyl‐3‐methylimidazolium acetate

Wei

Diao

Gao

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND: 2,2,3,3-tetrafluoro-1-propanol (TFP) is a good solvent that is applied in the electronic industry. To recover TFP from its aqueous solution, conventional distillation cannot be adopted because TFP and water can form a minimum azeotrope. RESULTS: In this work, extractive distillation is applied to separate the azeotropic mixture of TFP and water using 1-ethyl-3-methylimidazolium acetate ([EMIM][Ac]) as an entrainer. Based on the analysis of residual curve map, three processes are designed to separate the mixture. Extractive distillation processes (EDP) I and II consist of an extractive column and two flashes, and EDP III consists of an extractive column, a flash, and a stripper. For evaluating the three processes, total annual cost (TAC), CO 2 emissions and global energy consumption (GEC) are considered into the objective function. CONCLUSION:The simulated results show that EDP III with an extractive column, a flash, and a stripper can provide better economic and environmental benefits. Water can be obtained from the extractive column with a molar purity of 99.7%. TFP can be separated from the top of the flash and stripper with a molar purity of 99.7%. Furthermore, the control structure with two-point temperature for EDP III is explored and it shows good responses for the disturbances of feed flow rate and composition.

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Energy-efficient extractive pressure-swing distillation for separating binary minimum azeotropic mixture dimethyl carbonate and ethanol

Cited by 61 publications

References 47 publications

Molecular Mechanism and Extraction Performance Evaluation for Separation of Methanol and n-Hexane via Ionic Liquids as Extractant

Molecular Mechanism and Extraction Performance Evaluation for Separation of Methanol and n-Hexane via Ionic Liquids as Extractant

Computer-aided simulation and exergy analysis of TiO₂ nanoparticles production via green chemistry

Process design, evaluation and control for separation of 2,2,3,3‐tetrafluoro‐1‐propanol and water by extractive distillation using ionic liquid 1‐ethyl‐3‐methylimidazolium acetate

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Energy-efficient extractive pressure-swing distillation for separating binary minimum azeotropic mixture dimethyl carbonate and ethanol

Cited by 61 publications

References 47 publications

Molecular Mechanism and Extraction Performance Evaluation for Separation of Methanol and n-Hexane via Ionic Liquids as Extractant

Molecular Mechanism and Extraction Performance Evaluation for Separation of Methanol and n-Hexane via Ionic Liquids as Extractant

Computer-aided simulation and exergy analysis of TiO2 nanoparticles production via green chemistry

Process design, evaluation and control for separation of 2,2,3,3‐tetrafluoro‐1‐propanol and water by extractive distillation using ionic liquid 1‐ethyl‐3‐methylimidazolium acetate

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Computer-aided simulation and exergy analysis of TiO₂ nanoparticles production via green chemistry