Cellulose dissolution in aqueous NaOH–ZnO : effect of pulp pretreatment at macro and molecular levels

dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorVäisänen, Saijaen_US
dc.contributor.authorKosonen, Harrien_US
dc.contributor.authorRistolainen, Mattien_US
dc.contributor.authorVuorinen, Tapanien_US
dc.contributor.departmentDepartment of Bioproducts and Biosystemsen
dc.contributor.groupauthorWood Chemistryen
dc.contributor.organizationUPM Research Centeren_US
dc.date.accessioned2022-01-10T08:15:32Z
dc.date.available2022-01-10T08:15:32Z
dc.date.issued2021-05en_US
dc.descriptionFunding Information: This work was done in collaboration between UPM-Kymmene Corporation and Aalto University. The research team is thanked for the fruitful discussions at the project meetings. In addition, we are grateful for the support from Business Finland, Walter Ahlström foundation and the FinnCERES Materials Bioeconomy Ecosystem. Finally, M.Sc. Rubina Ajdary is highly thanked for her work in optimizing the dissolution system and Mrs. Rita Hatakka for her assistance with the HPAEC measurements. Funding Information: Open access funding provided by Aalto University. This work was a part of a joint research project between UPM-Kymmene Oyj and Aalto University. In addition, the authors would like to acknowledge the financial support from Business Finland, Walter Ahlström foundation and the FinnCERES Materials Bioeconomy Ecosystem. Publisher Copyright: © 2021, The Author(s). Copyright: Copyright 2021 Elsevier B.V., All rights reserved.
dc.description.abstractThis paper discusses the effect of hydrolytic pretreatments on pulp dissolution in the aqueous NaOH–ZnO solvent system. Eight samples were studied. They consisted of a never-dried softwood kraft pulp that was hydrolyzed under seven different conditions as well as the pulp without hydrolysis as a reference. The dissolution of the pulps was evaluated both at the macro level as well as at the molecular level based on their reactivity with 4-acetamido-2,2,6,6-tetramethylpiperidine-1-oxo-piperidium (4-AcNH-TEMPO+). The fiber properties (i.e. the extent of fibrillation, amount of fines and fiber width, coarseness, and length) as well as the chemical composition (hemicellulose and cellulose contents) and the viscosity of the pulps was investigated. The results show that hydrolysis at medium consistency (10%) was successful in increasing the solubility of cellulose. Hydrolysis at high consistency (50%), on the other hand, increased the solubility only to some extent. With extended treatment time the fibers formed aggregates and their dissolution became poor. This phenomenon could be overcome by mechanically refining the fibers after the hydrolysis. Moreover, comparison of the viscosity of the pulp over the degree of oxidation revealed that the viscosity needed to decrease below ca. 400 ml/g in order for the outer layers of the fibers to dissolve. Finally, when pulps with similar viscosities where compared against each other, the ones with the higher glucomannan contents formed gels over time. This was true also for the pulp with the lowest viscosity and the highest solubility of the studied samples.en
dc.description.versionPeer revieweden
dc.format.extent12
dc.format.extent4385-4396
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationVäisänen, S, Kosonen, H, Ristolainen, M & Vuorinen, T 2021, ' Cellulose dissolution in aqueous NaOH–ZnO : effect of pulp pretreatment at macro and molecular levels ', Cellulose, vol. 28, no. 7, pp. 4385-4396 . https://doi.org/10.1007/s10570-021-03779-wen
dc.identifier.doi10.1007/s10570-021-03779-wen_US
dc.identifier.issn0969-0239
dc.identifier.issn1572-882X
dc.identifier.otherPURE UUID: 29d5d944-13a5-4746-af60-27c0f72f78c5en_US
dc.identifier.otherPURE ITEMURL: https://research.aalto.fi/en/publications/29d5d944-13a5-4746-af60-27c0f72f78c5en_US
dc.identifier.otherPURE LINK: http://www.scopus.com/inward/record.url?scp=85102201674&partnerID=8YFLogxKen_US
dc.identifier.otherPURE FILEURL: https://research.aalto.fi/files/77916804/CHEM_V_is_nen_et_al_Cellulose_Dissolution_in_Aqueous_2021_Cellulose.pdfen_US
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/112146
dc.identifier.urnURN:NBN:fi:aalto-202201101058
dc.language.isoenen
dc.publisherSPRINGER
dc.relation.ispartofseriesCelluloseen
dc.relation.ispartofseriesVolume 28, issue 7en
dc.rightsopenAccessen
dc.subject.keywordCelluloseen_US
dc.subject.keywordDissolutionen_US
dc.subject.keywordHydrolysisen_US
dc.subject.keywordReactivityen_US
dc.subject.keywordTEMPO-oxidationen_US
dc.titleCellulose dissolution in aqueous NaOH–ZnO : effect of pulp pretreatment at macro and molecular levelsen
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi
dc.type.versionpublishedVersion
Files