One-Step Lignin Refining Process: The Influence of the Solvent Nature on the Properties and Quality of Fractions

Overview

Journal Polymers (Basel)

Publisher MDPI

Date 2022 Jun 24

PMID 35745939

Authors

Oihana Gordobil

Rene Herrera Diaz

Jakub Sandak

Anna Sandak

Affiliations

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Abstract

Heterogeneity of kraft lignin is one of the main limitations for the development of high-performance applications. Therefore, refining lignin using organic solvents is a promising strategy to obtain homogenous fractions with controlled quality in terms of structure and properties. In this work, one-step refining processes for hardwood kraft lignin using nine organic solvents of different chemical nature and polarity were carried out with the aim of investigating and understanding the effect of the type of organic solvent on the quality of resulting fractions. Structural features of both soluble and insoluble lignin fractions were assessed by GPC, Py-GC-MS, and FTIR linked to PCA analysis. Moreover, functional properties such as physical appearance, hygroscopicity, antioxidant capacity, and thermal properties were evaluated. The results evidenced the relationship between the nature and polarity of the solvents and the properties of the obtained soluble and insoluble fractions.

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