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Deep Eutectic Solvent Extraction of High-Purity Lignin from a Corn Stover Hydrolysate
Dylan J Cronin1, Xiaowen Chen2, Lalehvash Moghaddam3
1Bioproducts, Science & Engineering Laboratory, Washington State University, 2710 Crimson Way, Richland, WA, USA.
Chemsuschem
|July 17, 2020
Summary
Deep eutectic solvents efficiently extract high-purity lignin from corn stover hydrolysate, improving biorefinery economics. This method yields up to 75% lignin, offering controlled molecular weight and functional groups.
Area of Science:
- Biorefinery Processes
- Green Chemistry
- Biomass Valorization
Background:
- Lignocellulose biorefineries generate residues like corn stover hydrolysate (CSH).
- Efficient lignin extraction is crucial for biorefinery economic viability.
- Traditional lignin extraction methods often face challenges with purity and yield.
Purpose of the Study:
- To investigate the use of a lactic acid/chlorine chloride-based deep eutectic solvent (DES) for lignin extraction from CSH.
- To optimize DES extraction conditions (temperature, time, composition) for high lignin yield and purity.
- To analyze the structural characteristics of the extracted lignin.
Main Methods:
- Extraction of lignin from CSH using a lactic acid/chlorine chloride DES.
- Systematic variation of reaction temperature, time, and DES composition.
- Analysis of lignin yield, purity, molecular weight, and functional group content.
Main Results:
- Achieved high lignin yield (up to 75%) and purity (up to 94.7%) from CSH.
- Determined optimal extraction conditions correlating yield, purity, and structural properties.
- Demonstrated DES extraction's ability to produce lignin with controlled molecular weight and functional groups.
Conclusions:
- Deep eutectic solvent extraction is a promising and efficient method for obtaining high-purity lignin from biorefinery residues.
- This approach enhances the economic feasibility of lignocellulose biorefineries.
- DES extraction offers a pathway to tailor lignin properties for specific applications.
