High-purity cellulose production from birch wood by γ-valerolactone/water fractionation and IONCELL-P process

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Carbohydrate Polymers, Volume 288
This study presents an environmentally friendly process to produce high-purity cellulose (dissolving pulp) from birch wood by combining γ-valerolactone (GVL)/water fractionation and ionic liquid treatment of pulp, IONCELL-P (IP). A paper grade pulp was produced from optimal GVL cook with a similar composition to birch kraft pulp and was bleached with ECF sequence before the hemicelluloses were removed using the IONCELL-P process. The purity of the GVL-IP pulp significantly exceeded that of commercial prehydrolysis kraft (PHK) and prehydrolysis soda-anthraquinone (PH-Soda-AQ) pulps. IONCELL-P extraction removed more than 90% of the hemicelluloses, resulting in a dissolving pulp with a purity of 96% and a high molecular mass fraction, 2.3 times higher than that of a conventional PHK pulp. GVL-IP pulps are suitable not only for regenerated cellulose fibers or films, but also for high-purity, high-viscosity cellulose acetate and ethers, which cannot be produced in an environmentally friendly way by conventional processes.
Funding Information: The authors thank Aalto University staff for their supporting, especially Ms. Rita Hataka for her support with the chromatographic analysis. The authors also wish to acknowledge Professor Alistair King from Helsinki University to provide part of IL used in this research. This work was a part of the Academy of Finland's Flagship Programme under Project Nos. 318890 and 318891 (Competence Center for Materials Bioeconomy, FinnCERES). We would like to thank Dr. Eero Hiltunen and Professor Thad Maloney for their advices on the analyses of the paper-making properties analysis of our pulps. Publisher Copyright: © 2022 Elsevier Ltd
Cellulose, Dissolving pulp, GVL, Organosolv process
Other note
Shokri , S , Hedjazi , S , Lê , H Q , Abdulkhani , A & Sixta , H 2022 , ' High-purity cellulose production from birch wood by γ-valerolactone/water fractionation and IONCELL-P process ' , Carbohydrate Polymers , vol. 288 , 119364 . https://doi.org/10.1016/j.carbpol.2022.119364