Organosolv Pretreatment Processes for Lignocellulosic Biomass
Summary
Organosolv pretreatment involves the use of organic solvents—often blended with water and catalysed by acids or bases—to selectively solubilise lignin and hemicellulose from lignocellulosic biomass, thereby enhancing the accessibility of the remaining cellulose for enzymatic hydrolysis. By adjusting parameters such as solvent composition, temperature, pressure and residence time, it is possible to fine-tune delignification, minimise carbohydrate degradation and recover high-quality lignin fractions. Process configurations range from simple batch reactors to counter-current and continuous flow designs, as well as hybrid approaches that combine organosolv with steam explosion. The extracted lignin, rich in β-O-4 linkages, can serve as a precursor for chemicals, polymers and advanced materials, while the cellulose-rich solid fraction is readily saccharified to fermentable sugars for biofuels and biochemicals. Critical challenges include efficient solvent recovery, feedstock variability, energy demand and integration with downstream operations. Ongoing innovations aim to improve process economics and environmental performance, supporting the global transition to sustainable biorefineries and circular carbon utilisation.
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Organosolv Pretreatment Processes for Lignocellulosic Biomass publication trend
The graph below shows the total number of articles in organosolv pretreatment processes for lignocellulosic biomass across all publications each year (not limited to Nature Index journals).
Technical terms
Organosolv pretreatment: Use of organic solvents and catalysts to fractionate biomass into lignin, hemicellulose and cellulose streams.
Lignocellulosic biomass: Plant material composed of cellulose, hemicellulose and lignin, serving as renewable feedstock.
Delignification: Removal of lignin from biomass to improve accessibility of carbohydrates.
Saccharification: Enzymatic hydrolysis of cellulose and hemicellulose into fermentable sugars.
β-O-4 linkages: The most abundant interunit bonds in native lignin, key to its reactivity and depolymerisation.
References
- Semicontinuous Aqueous Acetone Organosolv Fractionation of Lignocellulosic Biomass: Improved Biorefinery Processing and Output. ACS Sustainable Chemistry & Engineering (2024).
- Organosolv pretreatment: an in-depth purview of mechanics of the system. Bioresources and Bioprocessing (2023).
- Laboratory- to Pilot-Scale Fractionation of Lignocellulosic Biomass Using an Acetone Organosolv Process. ACS Sustainable Chemistry & Engineering (2022).
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