Effect of Modified Cooking on Eucalyptus globulus and Eucalyptus nitens

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Joutsimo, Olli, Dr.
dc.contributor.author Antes, Rudine
dc.date.accessioned 2017-09-21T09:04:22Z
dc.date.available 2017-09-21T09:04:22Z
dc.date.issued 2017
dc.identifier.isbn 978-952-60-7602-7 (electronic)
dc.identifier.isbn 978-952-60-7603-4 (printed)
dc.identifier.issn 1799-4942 (electronic)
dc.identifier.issn 1799-4934 (printed)
dc.identifier.issn 1799-4934 (ISSN-L)
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/28060
dc.description.abstract The objective of this work is to evaluate how Eucalyptus globulus and Eucalyptus nitens wood raw materials perform in modified cooking: SuperBatch™ (SB), CompactCooking™ (CC) and Lo-Solids™ (LS). Modified cooking methods have been developed to improve kraft cooking yield, chemical and energy consumption, bleachability and paper's technical properties. The SB cooking technology needed a 20–30 units higher H-Factor than CC and LS to reach the same degree of delignification for both raw materials. The highest screened cooking yields were obtained from conventional batch cooking with E. globulus (approximately +1%), and the lowest from batch cooking with E. nitens (approximately -0.5%). For both species, the CC technology tended to produce unbleached pulps with a higher intrinsic viscosity (20–50 ml/g). The LS technology produced fibers with the highest fiber wall thickness and fiber saturation point (FSP) values. Modified cooking methods did not affect the water retention value (WRV); however, the different raw materials responded differently. E. nitens pulps presented 0.15 g/g higher WRVs for both bleached and unbleached pulps than E. globulus pulps. In terms of fiber surface composition, no differences could be attributed to modified cooking methods. The total charge of fibers after LS cooking was slightly higher (~10–20 mmol/kg) compared to that of fibers after the other cooking methods. From the results, it can be concluded that the modified cooking methods (SB, CC and LS) with a slightly different cooking chemistry do not contribute significantly to yield and other cooking parameters. The differences seen in mill environment within the modified cooking technologies can be attributed to the equipment design, wood column movement and alkali distribution within the column and control systems. The decision on selection of the technology to produce pulp from E. globulus and E. nitens has to be made based on other than cooking chemistry, rather operation parameters that improve mill process control and runnability of the pulp mill. These parameters are e.g. control and stability of chip feed, liquor to wood ratio and chip column movement. In addition, one can conclude that the main differences in the paper technical properties and fiber characteristics come from differences in fiber cell wall structures between the wood species and mechanical effects of the applied modified cooking technology. The results show that the industrial process conditions such as temperature, alkali charge, free and bound liquor gradients have more important impact than cooking chemistry itself on the pulping and pulp quality. en
dc.format.extent 88 + app. 78
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Aalto University en
dc.publisher Aalto-yliopisto fi
dc.relation.ispartofseries Aalto University publication series DOCTORAL DISSERTATIONS en
dc.relation.ispartofseries 170/2017
dc.relation.haspart [Publication 1]: Antes, R., and Joutsimo, O. P. (2015). Effect of modified cooking on chemical composition of pulps from Eucalyptus globulus and Eucalyptus nitens, BioResources. 10(1), 210-226.
dc.relation.haspart [Publication 2]: Antes, R., and Joutsimo, O. P. (2015). Effect of modified cooking on bleachability of Eucalyptus globulus and Eucalyptus nitens, BioResources. 10(1), 597-612.
dc.relation.haspart [Publication 3]: Antes, R., and Joutsimo, O. P. (2015). Effects of modified cooking on fiber wall structure of E. globulus and E. nitens, BioResources. 10(2), 2195-2212.
dc.relation.haspart [Publication 4]: Antes, R., and Joutsimo, O. P. (2015). Fiber surface and paper technical properties of Eucalyptus globulus and Eucalyptus nitens pulps after modified cooking and bleaching, BioResources. 10(1), 1599-1616.
dc.subject.other Paper technology en
dc.title Effect of Modified Cooking on Eucalyptus globulus and Eucalyptus nitens en
dc.type G5 Artikkeliväitöskirja fi
dc.contributor.school Kemian tekniikan korkeakoulu fi
dc.contributor.school School of Chemical Technology en
dc.contributor.department Biotuotteiden ja biotekniikan laitos fi
dc.contributor.department Department of Bioproducts and Biosystems en
dc.subject.keyword Eucalyptus globulus en
dc.subject.keyword Eucalyptus nitens en
dc.subject.keyword modified cooking en
dc.subject.keyword CompactCooking en
dc.subject.keyword SuperBatch en
dc.subject.keyword LoSolids en
dc.subject.keyword chemical composition en
dc.subject.keyword fiber cell wall structure en
dc.subject.keyword fiber surface en
dc.subject.keyword bleachability en
dc.identifier.urn URN:ISBN:978-952-60-7602-7
dc.type.dcmitype text en
dc.type.ontasot Doctoral dissertation (article-based) en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.contributor.supervisor Sixta, Herbert, Prof., Aalto University, Department of Bioproducts and Biosystems, Finland
dc.opn Colodette, Jorge, Prof., Federal University of Viçosa, Brazil
dc.rev Chirat, Christine, Prof., Grenoble INP – Pagora, France
dc.rev Jameel, Hasan, Prof., North Carolina State University, USA
dc.date.defence 2017-10-13

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