A novel process design for CO2 capture and H2S removal from the syngas using ionic liquid

Wang, Yinglong; Liu, Xiaobin; Krasławski, Andrzej; Gao, Jun; Cui, Peizhe

doi:10.1016/j.jclepro.2018.12.180

Cited by 116 publications

(58 citation statements)

References 45 publications

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“…Mature and widely used extractive distillation has advantages in the separation of this system [6]. As a new type of solvents, ionic liquids have unique properties and characteristics in the separation process [7][8][9]. Because of their high heat capacity and high recovery, they have potential as new extractants [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Energy‐Saving Separation of the Ethanol‐tert‐Butanol‐Water Azeotrope System Based on an Ionic Liquid

et al. 2022

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The separation requirements of the ethanol‐tert‐butanol‐water system are difficult to meet due to the formation of azeotropes under normal pressure. After screening the four most important ionic liquids, i.e., [BMIM][BF4], [EMIM][Cl], [HMIM][Cl], and [EMIM][AC], ionic liquid [EMIM][AC] was selected as extractant, and quantum chemical calculations based on COSMO‐SAC theory were carried out to analyze the mechanism of the separation process. An ethanol‐tert‐butanol‐water extractive distillation process was designed, optimized with the goal of the lowest total annual economic cost, and the cost of carbon dioxide emissions was calculated. To further save energy, a heat pump distillation process was designed and compared with the conventional ionic liquid process. The annual total cost of the heat pump distillation process is reduced by 10.11 %, and carbon dioxide emission costs are reduced by 61.9 %. Comparison with the conventional extractive distillation process and its modified process revealed economic advantages for the ionic liquid extractive distillation process and its heat pump version.

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Section: Introductionmentioning

confidence: 99%

Energy‐Saving Separation of the Ethanol‐tert‐Butanol‐Water Azeotrope System Based on an Ionic Liquid

et al. 2022

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“…Due to their favorable thermophysical properties, ionic liquids (ILs) are widely regarded as promising solvents in various separation processes, such as gas capture, − extraction, − and extractive distillation. , Especially in the extraction process, ILs have been applied in many different areas, e.g., separation of aromatic and aliphatic hydrocarbons, − purification of drugs and biomolecules, , and desulfurization and denitrogenation of fuel oils. − Compared to traditional organic solvents, IL solvents have a negligible vapor pressure that makes them unlikely to evaporate to the environment to cause pollution and solvent loss as well as ease solvent regeneration . However, there are approximately 10 18 anion–cation combinations that could be potentially synthesized, making the selection of a suitable IL solvent very difficult.…”

Section: Introductionmentioning

confidence: 99%

A Hierarchical Hybrid Method for Screening Ionic Liquid Solvents for Extractions Exemplified by the Extractive Desulfurization Process

Peng

Kleiweg

Winkelman

et al. 2021

ACS Sustainable Chem. Eng.

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A hierarchical hybrid method combining experimental-database-derived estimation of extraction performance, quantitative structure−property relationship (QSPR)-based assessment of IL physical and environmental properties, liquid−liquid extraction (LLE) measurement, and process evaluation is proposed to screen practically suitable ionic liquid (IL) solvents for different extractions. From the literature, 47 424 infinite dilution activity coefficient (IDAC) data including 12 IL families (e.g., imidazolium, pyridinium, ammonium, etc.) and 13 organic families (e.g., alkanes, aromatics, alcohols, etc.) are collected. On the basis of the IDAC data, the extraction performance of ILs for a specific separation can be estimated in terms of the distribution ratio and selectivity at infinite dilution. The ILs with potentially high extraction performance and meeting the physical and environmental properties criteria are selected to perform LLE experiments. Subsequently, process simulation and evaluation using the selected IL solvents are performed by Aspen Plus. To exemplify the proposed method, the extractive desulfurization (EDS) process is taken as a case study, where [EMIM][MESO 3 ] (1-ethyl-3-methylimidazolium methanesulfonate) and [EIM][NO 3 ] (1-ethylimidazolium nitrate) are selected after IDAC database searching and QSPR analysis. Experimental LLE with the two ILs are determined, demonstrating their promising extraction performance with the maximum selectivity (S 23 max ) for thiophene/heptane of 420 and 281.9, respectively. By fitting the NRTL model correspondingly, two processes using the screened ILs and sulfolane are developed and compared using Aspen Plus. It turns out that the two ILs save 66% and 48% in solvent requirements and 54% and 55% in energy consumption compared to those of sulfolane for the EDS task, respectively.

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“…14,15 In our previous work, a novel process for CO 2 capture from syngas using ILs was reported; [bmim][Tf because of its high CO 2 absorption capacity, low toxicity, and low viscosity. 16 Compared with the mature Rectisol process, the IL-based CCS process (CCS-IL) has more advantages for CO 2 removal rates, and because ILs can be recovered at room temperature, the power consumption of solvent recovery is reduced. In later work, 17,18 the original process was upgraded by multiobjective optimization to reduce energy consumption and improve energy utilization rates.…”

Section: ■ Introductionmentioning

confidence: 99%

“…However, amine-based solvents may cause environmental pollution due to decomposition or volatilization in the use process and require high regeneration energy. , Ionic liquids (ILs) have attracted much attention as a new kind of green physical CO 2 -absorbing solvent . Compared with the widely used amine-based CO 2 chemical absorbents, mainly MEA, ILs have the advantage of stable physical and chemical properties, they do not readily decompose or volatilize, low energy is required for regeneration, and they cause minimal environmental problems in the use stage. , In our previous work, a novel process for CO 2 capture from syngas using ILs was reported; [bmim][Tf 2 N] was chosen as a solvent because of its high CO 2 absorption capacity, low toxicity, and low viscosity . Compared with the mature Rectisol process, the IL-based CCS process (CCS-IL) has more advantages for CO 2 removal rates, and because ILs can be recovered at room temperature, the power consumption of solvent recovery is reduced.…”

Section: Introductionmentioning

confidence: 99%

Life Cycle Environmental Implications of Ionic-Liquid-Based Carbon Capture and Storage Processes and Its Alternative Improvement Cases

Zhang

Liu

Dai

et al. 2020

ACS Sustainable Chem. Eng.

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As a new type of solvent, ionic liquids (ILs) are considered to be promising in the field of CO 2 capture. Due to the lack of typical industrial process cases, it is necessary to conduct a life cycle assessment (LCA) to determine the environmental performance of IL-based chemical processes and explore possible improvements. In this work, the LCA method is used to evaluate the carbon capture and storage (CCS) process from the solvent production stage to the use stage with [bmim][Tf 2 N] IL as the CO 2 absorption solvent. The effects of different processes and CO 2 capture ratios on the environmental performance of CCS-IL are also explored, and some suggestions for improvement are provided. The LCA results show that the main environmental impact stage of the CCS-IL process is the solvent production stage, which has effects that are far beyond the environmental impact of the solvent use stage, and anion production is the main factor. The LCA results of the solvent use process show that optimization of the CCS-IL process can reduce the environmental burden of the solvent use stage. From the perspective of the global environment, the introduction of waste heat resources into the CCS process will have a positive impact on the environment. The sensitivity analysis shows that reducing the CO 2 capture ratio can reduce the environmental burden of the CCS-IL process, but it requires factories to bear a higher carbon tax and environmental responsibility. LCA analysis will help decision makers to further understand the IL-based chemical process and conduct accurate evaluations.

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A novel process design for CO2 capture and H2S removal from the syngas using ionic liquid

Cited by 116 publications

References 45 publications

Energy‐Saving Separation of the Ethanol‐tert‐Butanol‐Water Azeotrope System Based on an Ionic Liquid

Energy‐Saving Separation of the Ethanol‐tert‐Butanol‐Water Azeotrope System Based on an Ionic Liquid

A Hierarchical Hybrid Method for Screening Ionic Liquid Solvents for Extractions Exemplified by the Extractive Desulfurization Process

Life Cycle Environmental Implications of Ionic-Liquid-Based Carbon Capture and Storage Processes and Its Alternative Improvement Cases

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