Issue 15, 2023

Effect of autohydrolysis and ionosolv treatments on eucalyptus fractionation and recovered lignin properties

Abstract

Wood fractionation is key for the integral valorization of its three main components. In this sense, recovering the hemicellulosic fraction after the ionosolv treatment of lignocellulosic materials is one of the main drawbacks of this process. Thus, the incorporation of a previous autohydrolyisis step to recover the hemicellulosic sugars before the ionosolv treatment is an interesting approach. The influence of both treatments, autohydrolysis and ionosolv, on the biomass fractions recovery yields was studied by a central composite design of experiments, varying the autohydrolysis temperature in a 175–195 °C range and ionosolv time between 1–5 h. Lignin recovery and cellulose purity were maximized at 184 °C and 3.5 h of autohydrolysis temperature and ionosolv time, respectively. In addition, lignin properties were incorporated to the statistical model, revealing lignin recondensation at severe conditions and a higher influence of the ionosolv treatment on lignin characteristics. These results remarked the importance of studying the effect of both treatments in the whole fractionation process and not each process separately and enhanced the understanding of the treatments combination in a complete fractionation biorefinery approach.

Graphical abstract: Effect of autohydrolysis and ionosolv treatments on eucalyptus fractionation and recovered lignin properties

Supplementary files

Article information

Article type
Paper
Submitted
15 12 2022
Accepted
20 3 2023
First published
03 4 2023
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2023,13, 10338-10348

Effect of autohydrolysis and ionosolv treatments on eucalyptus fractionation and recovered lignin properties

A. Ovejero-Pérez, V. Rigual, J. C. Domínguez, M. V. Alonso, M. Oliet and F. Rodriguez, RSC Adv., 2023, 13, 10338 DOI: 10.1039/D2RA08013C

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