Ionic liquid-based green processes for ammonia separation and recovery

The emergence of ionic liquids (ILs) has provided a highly effective and energy-saving way for separation and recovery of NH3 owing to their remarkable advantages, such as very low volatility and structure designability. This review presents a comprehensive summary on the latest progresses of pure ILs, IL hybrid solvents, and IL composite materials for NH3 separation from the perspective of material design to process simulation, involving the role of anions, cations, and functional sites of ILs in NH3 separation performance of IL-based systems, the interaction mechanisms between ILs and NH3, as well as the simulation of IL -based NH3 separation process. Finally, the research challenges and perspectives of IL-based NH3 separation and recovery in future are discussed.