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. 2023 Apr 3;13(15):10338-10348.
doi: 10.1039/d2ra08013c. eCollection 2023 Mar 27.

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

Antonio Ovejero-Pérez  1 , Victoria Rigual  1 , Juan C Domínguez  1 , M Virginia Alonso  1 , Mercedes Oliet  1 , Francisco Rodriguez  1
Affiliations

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

Antonio Ovejero-Pérez et al. RSC Adv. .

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.

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Conflict of interest statement

There are no conflicts to declare.

Figures

Fig. 1
Fig. 1. Representation of statistical adjustment of hemicelluloses recovery as a function of autohydrolysis temperature.
Fig. 2
Fig. 2. Response surface plots of lignin (a) and CRF (b) recoveries.
Fig. 3
Fig. 3. Representation of statistical adjustment of lignin content in the cellulose rich fraction as a function of ionosolv time.
Fig. 4
Fig. 4. Mass balance per 100 g of eucalyptus wood at the optimum combined process conditions.
Fig. 5
Fig. 5. Representation of (a) and (b) molecular weight distributions (c) and (d) thermograms of the recovered lignins.
Fig. 6
Fig. 6. (a) Response surface plot for Mw and (b) representation of statistical adjustment polydispersity index as a function of ionosolv time.
Fig. 7
Fig. 7. Response surface plot of TD10%.
Fig. 8
Fig. 8. β-O-4′ and β-β′ linkages content and S/G ratio of the recovered lignins.
See this image and copyright information in PMC

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