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Published in: Cellulose 18/2021

17-10-2021 | Original Research

Deep eutectic solvent recycling to prepare high purity dissolving pulp

Authors: Yuanhang Chen, Kuizhong Shen, Zhibin He, Ting Wu, Chen Huang, Long Liang, Guigan Fang

Published in: Cellulose | Issue 18/2021

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Abstract

In this work, a novel acid-based deep eutectic solvent (DES) recycling process was developed for the pretreatment of eucalyptus wood chips in the preparation of high purity dissolving pulp. It was found that a large amount of lignin and xylan in the eucalyptus wood material were extracted in the recycling treatment with lactic acid/choline chloride. The dissolved lignin and xylan in DES were recovered by precipitation in water, and the DES solvent was regenerated by removing the water through evaporation. The residual lignin and xylan in the DES pre-treated wood chips were more readily removed in the subsequent kraft cooking and bleaching processes, yielding a high-purity dissolving pulp (DES-KP). Compared with the conventional prehydrolysis kraft based dissolving pulp (PHK), the DES-KP had a higher α-cellulose (94.02% vs. 89.81%) and a markedly higher Fock reactivity (98.94% vs. 60.97%). In addition, the DES pretreatment was also combined with oxygen-alkali cooking and ECF bleaching process, to prepare a dissolving pulp (DES-BP) with a high pulping yield (44.40%). The DES-KP pulping process was advantageous compared with the conventional PHK process in terms of the biorefinery concept, as the total utilization rate of the biomass of the eucalyptus wood chips reached 69.74%. Therefore, the DES pretreatment is a promising process for efficient biomass utilization in dissolving pulp production.

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Literature
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Metadata
Title
Deep eutectic solvent recycling to prepare high purity dissolving pulp
Authors
Yuanhang Chen
Kuizhong Shen
Zhibin He
Ting Wu
Chen Huang
Long Liang
Guigan Fang
Publication date
17-10-2021
Publisher
Springer Netherlands
Published in
Cellulose / Issue 18/2021
Print ISSN: 0969-0239
Electronic ISSN: 1572-882X
DOI
https://doi.org/10.1007/s10570-021-04188-9