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Reversible and non-reactive cellulose separations from ionic liquid mixtures with compressed carbon dioxide
David L Minnick1, Aaron M Scurto
1University of Kansas, Department of Chemical & Petroleum Engineering, Center for Environmentally-Beneficial Catalysis (CEBC), Lawrence, KS 66045, USA. ascurto@ku.edu.
Chemical Communications (Cambridge, England)
|July 11, 2015
Summary
Researchers developed a novel physical separation for cellulose using compressed carbon dioxide. This reversible process rapidly precipitates cellulose from ionic liquid mixtures with minor pressure changes.
Area of Science:
- Green Chemistry
- Materials Science
- Chemical Engineering
Background:
- Ionic liquids (ILs) are effective solvents for cellulose dissolution.
- Efficient and sustainable methods for cellulose recovery from ILs are needed.
- Current separation techniques can be complex or environmentally taxing.
Purpose of the Study:
- To present a novel physical separation method for cellulose recovery.
- To utilize compressed carbon dioxide as an anti-solvent for cellulose precipitation.
- To investigate the underlying separation mechanisms.
Main Methods:
- High pressure phase equilibrium measurements.
- High pressure Nuclear Magnetic Resonance (NMR) spectroscopy.
- Solid-state NMR spectroscopy.
Main Results:
- A novel, non-reactive physical separation of cellulose from IL/cosolvent mixtures was achieved using compressed CO2.
- Cellulose precipitation was rapid and fully reversible.
- Separation effectiveness was sensitive to small changes in pressure and CO2 composition.
Conclusions:
- Compressed CO2 offers a viable and efficient method for cellulose recovery from ionic liquid solutions.
- The physical separation is tunable via pressure and CO2 concentration, enabling controlled precipitation.
- Understanding the phase behavior and interactions is key to optimizing this green separation technology.
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