Capturing VOCs in the pharmaceutical industry with ionic liquids

Gui, Chengmin; Li, Guoxuan; Zhu, Ruisong; Lei, Zhigang; Dong, Yichun

doi:10.1016/j.ces.2022.117504

Cited by 25 publications

(16 citation statements)

References 52 publications

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“…301 Based on the COSMO-RS model, Gui et al selected IL [EMIM][Ac] as a candidate solvent to capture DCM and 1,2-dichloroethane (DCE). 302,303 The VLE experimental data of the DCM/DCE-IL systems were obtained. The VLE experiments showed that introducing an IL significantly reduced the vapor pressure of IL + DCM (or DCE) systems.…”

Section: [Bmim][bf 4 ] [Bmim][pf 6 ] [Bmim]-[ntf 2 ] [Bmim][dca] [Bmi...mentioning

confidence: 99%

“…When the exhaust gas flow rate is 100 N m 3 ·h –1 , the operating pressure is 100 kPa, the temperature is room temperature, and the absorbent flow rate is 5.3 mol·h –1 , the DCM in the exhaust gas at the top of the absorption column meets the emission requirements . Based on the COSMO-RS model, Gui et al selected IL [EMIM][Ac] as a candidate solvent to capture DCM and 1,2-dichloroethane (DCE). , The VLE experimental data of the DCM/DCE-IL systems were obtained. The VLE experiments showed that introducing an IL significantly reduced the vapor pressure of IL + DCM (or DCE) systems.…”

Section: Chlorinated Vocs (Cvocs) Gases Capturementioning

confidence: 99%

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Condensable Gases Capture with Ionic Liquids

Chen

Lei

et al. 2023

Chem. Rev.

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Condensable gases are the sum of condensable and volatile steam or organic compounds, including water vapor, which are discharged into the atmosphere in gaseous form at atmospheric pressure and room temperature. Condensable toxic and harmful gases emitted from petrochemical, chemical, packaging and printing, industrial coatings, and mineral mining activities seriously pollute the atmospheric environment and endanger human health. Meanwhile, these gases are necessary chemical raw materials; therefore, developing green and efficient capture technology is significant for efficiently utilizing condensed gas resources. To overcome the problems of pollution and corrosion existing in traditional organic solvent and alkali absorption methods, ionic liquids (ILs), known as “liquid molecular sieves”, have received unprecedented attention thanks to their excellent separation and regeneration performance and have gradually become green solvents used by scholars to replace traditional absorbents. This work reviews the research progress of ILs in separating condensate gas. As the basis of chemical engineering, this review first provides a detailed discussion of the origin of predictive molecular thermodynamics and its broad application in theory and industry. Afterward, this review focuses on the latest research results of ILs in the capture of several important typical condensable gases, including water vapor, aromatic VOCs (i.e., BTEX), chlorinated VOC, fluorinated refrigerant gas, low-carbon alcohols, ketones, ethers, ester vapors, etc. Using pure IL, mixed ILs, and IL + organic solvent mixtures as absorbents also briefly expanded the related reports of porous materials loaded with an IL as adsorbents. Finally, future development and research directions in this exciting field are remarked.

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Section: [Bmim][bf 4 ] [Bmim][pf 6 ] [Bmim]-[ntf 2 ] [Bmim][dca] [Bmi...mentioning

confidence: 99%

Section: Chlorinated Vocs (Cvocs) Gases Capturementioning

confidence: 99%

Condensable Gases Capture with Ionic Liquids

Chen

Lei

et al. 2023

Chem. Rev.

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“…Ionic liquids are molten salts that consist of organic cations and inorganic anions. As a promising neoteric solvent, ILs have been widely used in separation fields such as gas absorption, − extractive distillation, and liquid–liquid extraction. − ,, Compared to organic solvents, which easily volatilize and cause environmental pollution, the major advantages of ILs are their nonvolatility, broad liquid temperature range, good thermal stability, and high solvent capacity. Their attractive thermodynamic and physical properties make them sustainable solvents in diverse separation areas, especially in liquid–liquid extraction.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Ionic Liquids as Extraction Solvents for Separating Bicyclic Aromatic S/N-Compounds from FCC Diesel

Liu

Gui

et al. 2023

ACS Sustainable Chem. Eng.

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To improve the quality of fluid catalytic cracking (FCC) diesel, ionic liquids (ILs) were used as promising neoteric solvents to extract bicyclic S/N-compounds (quinoline and 1-benzothiophene) from FCC model oil. In addition to the thermodynamic properties, including solvent capacity and selectivity, physical properties such as viscosity and thermal stability are also considered as important factors in the IL screening process. 1-Ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C2MIM][NTF2]) was selected as the most suitable extraction solvent by the COSMO-RS model, and the accuracy of this model was verified based on the collected experimental data. Liquid–liquid equilibrium experiments were performed to study the effects of the initial quinoline and 1-benzothiophene concentrations, mass solvent ratio, extraction stages, and the presence of other aromatics on the extraction efficiency. Then, the extraction mechanism and the differences in the extraction effects for the quinoline and 1-benzothiophene systems were explored by quantum chemical calculation and molecular dynamics simulation. The consistency between experiments and theoretical calculation indicates that the electrostatic interaction is the main reason for the difference in the extraction efficiency between the quinoline and 1-benzothiophene systems.

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“…Among the typical recovery methods, such as solvent absorption, 16,17 solid adsorption, 18 and condensation, 19 the most commonly used method is solvent absorption, which benefits from its simple operation and high feeding capacity. 20 Absorption of CVOCs in heavy solvents, also called high-boiling point organic solvents (e.g., silicone oil, cutting oil, and di(2-ethylhexyl) adipate) has been frequently investigated as potential technique allowing the purification of gas streams. 16,21,22 It is noteworthy that the absorbent regeneration process using heavy solvents requires a distillation column which will consume more energy.…”

Section: Introductionmentioning

confidence: 99%

“…16,21,22 It is noteworthy that the absorbent regeneration process using heavy solvents requires a distillation column which will consume more energy. 20 Moreover, the undesired entrainment of heavy solvent by the purified gas causes solvent loss and environmental pollution. 23 Ionic liquids (ILs) are receiving special attention in the past two decades, primarily as potential alternatives to traditional organic solvents in chemical processes, owing to their excellent properties such as negligible volatility, high thermal stability, selectivity, and so forth.…”

Section: Introductionmentioning

confidence: 99%

Ionic liquids for highly efficient methyl chloride capture and dehydration

et al. 2023

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A new methyl chloride (CH3Cl) capture and dehydration process using two ionic liquids (ILs) was designed and systematically studied. ILs [EMIM][Ac] and [EMIM][BF4] were screened out as CH3Cl capture and drying absorbents through the COSMO‐RS model. The result of solubility experiment suggests [EMIM][Ac] has an excellent solvent capacity for CH3Cl at mild operation conditions. The bench‐scale CH3Cl absorption experiments further confirmed the outstanding CH3Cl capture ability of [EMIM][Ac]. Besides, the water content of outlet gas can be decreased to 452 ppm (ma's fraction) using [EMIM][BF4] in the dehydration experiment. The industrial‐scale CH3Cl capture and dehydration process was simulated and optimized. Compared to the benchmarked triethylene glycol process, IL process has higher product purity (99.99 wt%), and lower energy consumption. The quantum chemical calculations clearly revealed the relationship between hydrogen bond and separation performance. This study provides a decision‐making basis for designing green process associated with volatile organic compounds.

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Capturing VOCs in the pharmaceutical industry with ionic liquids

Cited by 25 publications

References 52 publications

Condensable Gases Capture with Ionic Liquids

Condensable Gases Capture with Ionic Liquids

Investigation of Ionic Liquids as Extraction Solvents for Separating Bicyclic Aromatic S/N-Compounds from FCC Diesel

Ionic liquids for highly efficient methyl chloride capture and dehydration

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