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A Multistep, Multicomponent Extraction and Separation Microfluidic Route to Recycle Water-Miscible Ionic Liquid

Bin Pan¹, Lanja R Karadaghi², Richard L Brutchey²

¹Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, 925 Bloom Walk, Los Angeles, California 90089-1211, United States.

Industrial & Engineering Chemistry Research

|January 15, 2024

Summary

Recycling water-miscible ionic liquids (ILs) is now feasible using hydrophobic ILs as accommodating agents. This novel membrane-assisted process effectively purifies ILs for reuse, reducing costs and waste.

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Area of Science:

Green Chemistry
Chemical Engineering
Materials Science

Background:

Ionic liquids (ILs) are expensive solvents, and their recycling is crucial for reducing lifecycle costs.
Direct recycling of water-miscible ILs is challenging due to their miscibility with common washing agents like water.

Purpose of the Study:

To develop an effective recycling route for water-miscible ionic liquids.
To demonstrate a proof-of-concept for IL solvent recovery using a novel membrane-assisted liquid-liquid extraction method.

Main Methods:

Utilized hydrophobic ionic liquids as accommodating agents to extract water-miscible ILs from aqueous streams.
Employed a membrane to separate the biphasic slug flow of mixed ILs and water.
Recovered the purified water-miscible IL using acidified water and vacuum drying.

Main Results:

Successfully recycled 1-butyl-3-methylimidazolium trifluoromethanesulfonate (BMIM-OTf) using 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (BMIM-NTf2) as an accommodating agent.
Demonstrated the recycling of 1-butyl-1-methylpyrrolidinium triflate (BMPYRR-OTf) from a platinum nanoparticle synthesis application.
Showcased the recyclability of both the water-miscible IL and the accommodating agent.

Conclusions:

The developed membrane-assisted liquid-liquid extraction process offers an efficient method for recycling challenging water-miscible ionic liquids.
This approach significantly reduces the cost and environmental impact associated with IL solvent usage.
The method is applicable to both model systems and realistic synthetic applications, paving the way for sustainable IL utilization.