Abstract
Introduction: Understanding the fractions of lignin is important for further conversion of lignin into valuable products. Herein, the “home-made” lignin from Earleaf Acacia tree was extracted by sequential industrial organic solvent and characterized each fraction to reveal its properties for further catalytic applications.
 Methods: In this work, lignin was prepared from the Earleaf Acacia tree using the soda method. Then, the prepared lignin was fractionated by sequential solvents of ethyl acetate, ethanol, methanol, and acetone. Each lignin fractions were characterized by FT-IR and GPC.
 Results: The FT-IR results confirmed the soda method can produce lignin from woodchips. The fractionation of lignin separated the lignin mixture into different molecular weight fraction from light – medium into heavy compounds.
 Conclusion: Lignin was produced from woodchips using the soda method successfully. The fractionation using the sequential organic solvents showed the separation of different molecular weight of lignin, which allow to apply for the further conversion into useful products.
Highlights
Understanding the properties of the lignin's fractions is important for further conversion of lignin into valuable products
Thehome-made'' lignin from the Earleaf Acacia tree was extracted by the sequential industrial organic solvents and characterized the fractions to reveal their properties for further applications
The prepared lignin was sequentially fractionated with ethyl acetate, ethanol, methanol, and acetone as described elsewhere (3)
Summary
Understanding the properties of the lignin's fractions is important for further conversion of lignin into valuable products. The`home-made'' lignin from the Earleaf Acacia tree was extracted by the sequential industrial organic solvents and characterized the fractions to reveal their properties for further applications. The prepared lignin was fractionated by the sequential solvents of ethyl acetate, ethanol, methanol, and acetone. The fractionation using the sequential organic solvents showed the separation of lignin into different molecular weights fractions. The lignin’s fractions with different molecular weights can be applied for different purposes and transformed into chemicals and fuels with a suitable condition. To fractionate lignin into different parts, lignin produced from the Earleaf acacia tree, an abundant tree to reforest and use in the pulp and paper industry in Vietnam, is fractionated into different fractions. The solvent extraction has been applied to fractionate according to molecular weight by sequential extraction
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