Condensable Gases Capture with Ionic Liquids.
Guoxuan Li1, Kai Chen2, Zhigang Lei1,2
1State Key Laboratory of Chemical Resource Engineering, Beijing Key Laboratory of Energy Environmental Catalysis, Beijing University of Chemical Technology, Box 266, Beijing 100029, China.
Chemical Reviews
|August 9, 2023
Summary
Ionic liquids offer a green solution for capturing harmful condensable gases, which are valuable chemical resources. This review highlights their progress in separating various gases like water vapor and VOCs.
Area of Science:
- Environmental Chemistry
- Chemical Engineering
- Materials Science
Background:
- Condensable gases from industrial activities pose environmental and health risks.
- These gases are also valuable chemical feedstocks, necessitating efficient recovery.
- Traditional capture methods using organic solvents or alkali absorption have drawbacks like pollution and corrosion.
Purpose of the Study:
- To review the advancements in using ionic liquids (ILs) for separating condensable gases.
- To discuss the role of predictive molecular thermodynamics in this field.
- To explore the application of ILs in capturing specific industrial gases.
Main Methods:
- Review of existing literature on ionic liquids for gas separation.
- Discussion of molecular thermodynamics principles relevant to gas capture.
- Analysis of ILs as absorbents (pure, mixed, and in solvent mixtures) and adsorbents (ILs on porous materials).
Main Results:
- Ionic liquids demonstrate excellent separation and regeneration performance for condensable gases.
- ILs are effective in capturing water vapor, aromatic VOCs (BTEX), chlorinated VOCs, refrigerant gases, alcohols, ketones, ethers, and esters.
- Porous materials loaded with ILs also show promise as adsorbents.
Conclusions:
- Ionic liquids are emerging as effective green solvents for condensable gas capture, replacing traditional methods.
- Further research into ILs offers significant potential for resource utilization and environmental protection.
- Future directions include optimizing IL-based systems and exploring novel applications.
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