Ionic Liquid Applications in Biomass Processing and Biofuel Production

Ionic liquids have emerged as versatile solvents for the efficient processing of lignocellulosic biomass into fuels and chemicals. Their negligible vapour pressure and designable solvation properties enable the selective dissolution and fractionation of cellulose, hemicellulose and lignin from agricultural residues, energy crops and forestry wastes. By disrupting the rigid plant cell-wall structure, ionic liquids enhance the accessibility of polysaccharides to hydrolytic enzymes, supporting high yields of fermentable sugars in integrated pretreatment and saccharification processes. Advances in low-cost protic ionic liquids and hybrid solvent systems have addressed economic barriers by enabling facile recovery and reuse, while novel enzyme-tolerant formulations minimise biocatalyst inactivation. Recent efforts in process intensification—such as one-pot schemes and high-solid loadings—have demonstrated rapid fractionation at scale. Concurrent progress in predictive modelling is guiding the molecular design of next-generation ionic liquids with tailored interactions for lignin extraction, co-product valorisation and closed-loop operation. Together, these developments position ionic liquid-based technologies as key enablers of a circular bioeconomy and low-carbon fuel production on a global scale.

Research from Nature Portfolio

No recent Nature Portfolio content available.

Ionic Liquid Applications in Biomass Processing and Biofuel Production publication trend

The graph below shows the total number of articles in ionic liquid applications in biomass processing and biofuel production across all publications each year (not limited to Nature Index journals).

Technical terms

Ionic liquid: A salt that is liquid below 100 °C, composed entirely of ions and used as a tunable solvent for biomass fractionation.

Lignocellulosic biomass: Plant-derived material rich in cellulose, hemicellulose and lignin, serving as a renewable feedstock for biofuels.

Pretreatment: A preparatory stage that alters biomass structure to enhance the efficiency of subsequent hydrolysis or extraction steps.

Enzymatic saccharification: The conversion of polysaccharides into fermentable sugars by cellulase and related enzymes.

Deep eutectic solvent: A mixture of compounds that forms a low-melting liquid, often used alongside ionic liquids to purify biopolymers.

Quantitative structure–property relationship (QSPR): A computational model linking chemical structure features to physical properties, used to predict solvent performance in biomass processing.

References

1. Purifying cellulose from major waste streams using ionic liquids and deep eutectic solvents. Current Opinion in Green and Sustainable Chemistry (2023).
2. Modeling lignin extraction with ionic liquids using machine learning approach. The Science of The Total Environment (2024).
3. Enzymatic hydrolysis of lignocellulosic polysaccharides in the presence of ionic liquids. Green Chemistry (2015).
4. Rapid pretreatment of Miscanthus using the low-cost ionic liquid triethylammonium hydrogen sulfate at elevated temperatures. Green Chemistry (2018).
5. Scale-up and evaluation of high solid ionic liquid pretreatment and enzymatic hydrolysis of switchgrass. Biotechnology for Biofuels and Bioproducts (2013).