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Title: Lignin Extraction from Waste Pine Sawdust Using a Biomass Derived Binary Solvent System
Authors: Magalhães, Solange 
Filipe, Alexandra 
Melro, Elodie 
Fernandes, Catarina 
Vitorino, Carla 
Alves, Luís 
Romano, Anabela
Rasteiro, Maria G. 
Medronho, Bruno 
Keywords: biomass fractionation; formic acid; levulinic acid; lignin; maritime pine
Issue Date: 30-Mar-2021
Publisher: MDPI
Project: PTDC/AGR-TEC/4814/2014 PTDC/ASP-SIL/30619/2017 
researcher grant CEECIND/01014/2018 
PhDs grant (SFRH/BD/ 132835/2017) 
PhDs grant (2020.07638.BD) 
Serial title, monograph or event: Polymers
Volume: 13
Issue: 7
Abstract: Lignocellulosic biomass fractionation is typically performed using methods that are somehow harsh to the environment, such as in the case of kraft pulping. In recent years, the development of new sustainable and environmentally friendly alternatives has grown significantly. Among the developed systems, bio-based solvents emerge as promising alternatives for biomass processing. Therefore, in the present work, the bio-based and renewable chemicals, levulinic acid (LA) and formic acid (FA), were combined to fractionate lignocellulosic waste (i.e., maritime pine sawdust) and isolate lignin. Different parameters, such as LA:FA ratio, temperature, and extraction time, were optimized to boost the yield and purity of extracted lignin. The LA:FA ratio was found to be crucial regarding the superior lignin extraction from the waste biomass. Moreover, the increase in temperature and extraction time enhances the amount of extracted residue but compromises the lignin purity and reduces its molecular weight. The electron microscopy images revealed that biomass samples suffer significant structural and morphological changes, which further suggests the suitability of the newly developed bio-fractionation process. The same was concluded by the FTIR analysis, in which no remaining lignin was detected in the cellulose-rich fraction. Overall, the novel combination of bio-sourced FA and LA has shown to be a very promising system for lignin extraction with high purity from biomass waste, thus contributing to extend the opportunities of lignin manipulation and valorization into novel added-value biomaterials.
ISSN: 2073-4360
DOI: 10.3390/polym13071090
Rights: openAccess
Appears in Collections:I&D CIEPQPF - Artigos em Revistas Internacionais
I&D CQC - Artigos em Revistas Internacionais
I&D CNC - Artigos em Revistas Internacionais
FFUC- Artigos em Revistas Internacionais

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