Lignin Extraction from Waste Pine Sawdust Using a Biomass Derived Binary Solvent System.

Area of Science:

• Biomass Processing
• Green Chemistry
• Sustainable Materials

Background:

• Traditional lignocellulosic biomass fractionation methods like kraft pulping are environmentally harsh.
• There is a growing need for sustainable and eco-friendly alternatives in biomass processing.
• Bio-based solvents present a promising avenue for environmentally benign biomass fractionation.

Purpose of the Study:

• To develop and optimize a novel bio-based solvent system for efficient lignin extraction from lignocellulosic waste.
• To investigate the impact of key parameters (LA:FA ratio, temperature, time) on lignin yield and purity.
• To assess the structural and chemical integrity of the biomass fractions obtained through the new process.

Main Methods:

• Fractionation of maritime pine sawdust using a combination of levulinic acid (LA) and formic acid (FA).
• Optimization of process parameters including LA:FA ratio, temperature, and extraction time.
• Characterization of extracted lignin and residual biomass using electron microscopy and FTIR analysis.

Main Results:

• The LA:FA ratio was identified as a critical factor for superior lignin extraction.
• Increased temperature and extraction time improved residue yield but decreased lignin purity and molecular weight.
• Electron microscopy and FTIR analysis confirmed significant biomass structural changes and effective lignin removal.

Conclusions:

• The novel combination of bio-sourced FA and LA is a highly promising system for extracting high-purity lignin from biomass waste.
• This bio-fractionation process offers significant potential for lignin valorization into novel added-value biomaterials.
• The developed method represents a sustainable and environmentally friendly alternative to conventional biomass processing techniques.