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Adapting the kraft cooking process in glycerol media. Studies of impregnation kinetics
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center.ORCID iD: 0000-0002-7880-3888
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.ORCID iD: 0000-0002-2900-4713
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.ORCID iD: 0000-0002-8614-6291
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.ORCID iD: 0000-0001-8817-2031
2023 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 38, no 1, p. 9-18Article in journal (Refereed) Published
Abstract [en]

Although organosolv processes using high-boiling solvents have been investigated in recent decades for developing novel industrial processes, there are potential benefits of using high-boiling point solvents for traditional sulphate-based cooking processes, both from an industrial perspective and from a laboratory perspective. Using high-boiling solvents, experiments can be done under atmospheric conditions, thus making it easier to continually monitor laboratory experiments and extracting aliquots at desired intervals. Using such a system, alkaline consumption was monitored during impregnation of spruce chips in glycerol media using chemical charges of 1 M NaOH and 0.1 M NaHS, i. e., kraft pulping conditions, and compared to a similar investigation of alkaline consumption in water media using steel autoclaves. The resulting data was fitted to a first order kinetic model, with an apparent activation energy of 22 kJ mol-1 in glycerol media. Finally, a "normal quality pulp"of kappa number 28 and a viscosity of 1113 ml g-1 was successful produced using a cooking process with an impregnation step at 140 °C for 3 h and a cooking step at 160 °C for 4 h. A nuclear magnetic resonance study on the dissolved lignin produced for said experiment showed characteristics typical of other kraft lignins.

Place, publisher, year, edition, pages
Walter de Gruyter GmbH , 2023. Vol. 38, no 1, p. 9-18
Keywords [en]
alkali consumption, atmospheric pulping, kraft pulping, organosolv pulping, spruce
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:kth:diva-328845DOI: 10.1515/npprj-2022-0023ISI: 000883823100001Scopus ID: 2-s2.0-85143266828OAI: oai:DiVA.org:kth-328845DiVA, id: diva2:1768244
Note

QC 20241203

Available from: 2023-06-15 Created: 2023-06-15 Last updated: 2025-02-25Bibliographically approved

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Lindén, Pär A.Lindström, MikaelLawoko, MartinHenriksson, Gunnar

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Fibre- and Polymer TechnologyWallenberg Wood Science Center
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