Acacia Wood Fractionation Using Deep Eutectic Solvents: Extraction, Recovery, and Characterization of the Different...

Area of Science:

• Biomass valorization and green chemistry
• Sustainable materials science
• Forestry and invasive species management

Background:

• Increasing demand for sustainable materials drives interest in lignocellulosic biomass.
• Deep eutectic solvents (DESs) are emerging as eco-friendly alternatives for biomass processing.
• Acacia wood (Acacia dealbata Link) is an invasive species with potential as a lignocellulosic resource.

Purpose of the Study:

• To investigate the potential of a choline chloride and levulinic acid (ChCl:LA) DES for fractionating invasive acacia wood.
• To optimize DES parameters for enhanced yield and purity of cellulose and lignin.
• To characterize the properties of the extracted lignin.

Main Methods:

• Fractionation of acacia wood using a choline chloride:levulinic acid (ChCl:LA) deep eutectic solvent.
• Optimization of extraction parameters including temperature and time.
• Characterization of extracted lignin using molecular weight analysis and 31P NMR spectroscopy.

Main Results:

• The ChCl:LA DES effectively fractionated acacia wood, with optimal performance at a 1:3 ratio.
• Increased temperature and extraction time enhanced material yield but reduced lignin purity.
• Extracted lignin showed minimal depolymerization, comparable molecular weight to kraft lignin, and a high content of reactive phenolic hydroxyl groups.

Conclusions:

• Choline chloride:levulinic acid (ChCl:LA) DES is a promising, renewable solvent system for fractionating wood residues.
• The DES enables recovery of valuable cellulose and reactive lignin fractions from invasive acacia.
• This approach supports sustainable resource management and the circular economy.