A one-pot route to extract and chemically modify lignin from a pre-treated Phragmites australis lignocellulosic biomass is proposed herein. The lignocellulosic biomass was first pre-treated through steam explosion at two different severity factors. Lignin was then extracted from the steam-exploded biomasses through a microwave-assisted organosolv extraction method, solely using γ-valerolactone as solvent. The most severe steam explosion condition yielded a delignification of 78%. Morphological analysis, spectroscopic investigation and thermal characterization showed that essentially pure lignin was extracted through this process. Lignin was then chemically modified in the γ-valerolactone extraction solution, through acetylation and Mannich condensation. This work provides proof-of-evidence that pure lignin can be solvent-extracted in high yields from a pre-treated biomass without the addition of any further chemicals and successfully modified in a one-pot route through a cleaner process. The modified lignin could be used as building block for the development of novel bio-based polymer materials.

One-pot lignin extraction and modification in γ-valerolactone from steam explosion pre-treated lignocellulosic biomass

INGLES, DAVID;GELOSIA, MATTIA
;
POMPILI, ENRICO;CAVALAGLIO, GIANLUCA;COTANA, Franco;
2017

Abstract

A one-pot route to extract and chemically modify lignin from a pre-treated Phragmites australis lignocellulosic biomass is proposed herein. The lignocellulosic biomass was first pre-treated through steam explosion at two different severity factors. Lignin was then extracted from the steam-exploded biomasses through a microwave-assisted organosolv extraction method, solely using γ-valerolactone as solvent. The most severe steam explosion condition yielded a delignification of 78%. Morphological analysis, spectroscopic investigation and thermal characterization showed that essentially pure lignin was extracted through this process. Lignin was then chemically modified in the γ-valerolactone extraction solution, through acetylation and Mannich condensation. This work provides proof-of-evidence that pure lignin can be solvent-extracted in high yields from a pre-treated biomass without the addition of any further chemicals and successfully modified in a one-pot route through a cleaner process. The modified lignin could be used as building block for the development of novel bio-based polymer materials.
2017
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11391/1402040
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