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Updated: Mar 17, 2026
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Pretreatment of Lignocellulosic Biomass with Low-cost Ionic Liquids
Published on: August 10, 2016
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Cellulose Solubility in Ionic Liquid Mixtures: Temperature, Cosolvent, and Antisolvent Effects.
David L Minnick1, Raul A Flores1, Matthew R DeStefano1
1Department of Chemical & Petroleum Engineering and Center for Environmentally Beneficial Catalysis, University of Kansas , Lawrence, Kansas 66045, United States.
The Journal of Physical Chemistry. B
|July 23, 2016
Summary
Ionic liquids (ILs) can dissolve cellulose by breaking hydrogen bonds. Adding aprotic cosolvents enhances cellulose dissolution in [EMIm][DEP] ILs, while protic antisolvents decrease it.
Area of Science:
- Cellulose chemistry
- Ionic liquid applications
- Thermodynamics
Background:
- Ionic liquids (ILs) show potential for dissolving cellulose by disrupting hydrogen bonds.
- Understanding solvent effects is crucial for optimizing cellulose dissolution processes.
Purpose of the Study:
- To investigate the thermodynamic solid-liquid equilibrium of cellulose dissolution in [EMIm][DEP] and its mixtures with various solvents.
- To determine the impact of protic antisolvents and aprotic cosolvents on cellulose solubility in ILs.
Main Methods:
- Measurement of thermodynamic solid-liquid equilibrium for microcrystalline cellulose in [EMIm][DEP] and solvent mixtures.
- Solubility studies across a temperature range of 40-120 °C.
- Analysis of IL-solvent interactions using Kamlet-Taft solvatochromic analysis, FTIR, and NMR spectroscopy.
Main Results:
- Cellulose solubility in pure [EMIm][DEP] reached a maximum of ~20 mass % above 100 °C.
- Protic solvents (ethanol, methanol, water) reduced cellulose capacity by 38-100% in IL mixtures.
- Aprotic cosolvents (DMSO, DMF, DMI) enhanced cellulose dissolution by 20-60% compared to pure [EMIm][DEP].
Conclusions:
- Solvent choice significantly impacts cellulose dissolution capacity in ILs.
- Preferential solvation of IL ions by co- and antisolvents alters their interaction with cellulose.
- Aprotic cosolvents are promising for enhancing cellulose dissolution in IL-based systems.
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