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Dissertations / Theses on the topic 'Wood delignification'

Author: Grafiati

Published: 7 September 2021

Last updated: 29 July 2025

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1

Violette, Steven M. "Oxygen Delignification Kinetics and Selectivity Improvement." Fogler Library, University of Maine, 2003. http://www.library.umaine.edu/theses/pdf/VioletteSM2003.pdf.

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2

Chia, John Teng San 1975. "Oxygen-alkali delignification of mechanically pretreated wood." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=33963.

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Oxygen-alkaline pulping is a sulphur-free chemical pulping process, which has a potential to replace the kraft process as an environmentally more viable alternative. However, there are some drawbacks to the process, which have so far prevented it from commercialization. The penetration of oxygen into the structure of wood chips and rather severe degradation of carbohydrates are the main problems that result in high reject contents and low pulp strengths. In this study, wood chips, after presoaking in a 0.2% solution of alkali, were mechanically treated in a compression screw feeder with the ai

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3

Ji, Yun. "Kinetics and Mechanism of Oxygen Delignification." Fogler Library, University of Maine, 2007. http://www.library.umaine.edu/theses/pdf/JiY2007.pdf.

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4

Widiatmoko. "Oxygen delignification process chemistry for Acacia." Thesis, Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-10212006-130331/.

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5

Hsu, Chieh-Lung Jay. "Mass transfer and kinetics in oxygen delignification of wood pulp." Diss., Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/10965.

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6

Krothapalli, Deep. "Gas-liquid Mass Transfer in Oxygen Delignification Systems." Fogler Library, University of Maine, 2004. http://www.library.umaine.edu/theses/pdf/KrothapalliD2004.pdf.

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7

Zou, Haixuan. "Effect of Kraft Pulping on Oxygen Delignification." Fogler Library, University of Maine, 2002. http://www.library.umaine.edu/theses/pdf/ZouH2002.pdf.

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8

Dang, Zheng. "Pulp Pretreatments for Improved Selectivity and Extended Oxygen Delignification." Fogler Library, University of Maine, 2002. http://www.library.umaine.edu/theses/pdf/DangZ2002.pdf.

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9

Lourenço, Ana Carina dos Santos. "The influence of heartwood on kraft delignification of Eucalyptus globulus wood." Doctoral thesis, ISA/UTL, 2012. http://hdl.handle.net/10400.5/5199.

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10

Cui, Yu. "Delignification of Kraft-AQ Southern Pine Pulp with Hydrogen Peroxide Catalyzed by Mn(IV)2-Me4DTNE." NCSU, 2000. http://www.lib.ncsu.edu/theses/available/etd-20000203-202106.

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<p>Over the years, hydrogen peroxide has been used to improve the brightness of pulp at the end of a bleaching sequence. However, the degree of delignification achieved by a hydrogen peroxide stage is usually modest. That is because in alkaline condition the hydroperoxy anion reacts with chromophores in pulp as a nucleophile that does not oxidize residual lignin to a significant extent. In order to enhance the reactivity of hydrogen peroxide as an oxidant, a binuclear manganese complex Mn(IV)2-Me4DTNE was added. As a result, the degree of delignification was significantly improved, while at th

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11

ADASKAVEG, JAMES ELLIOTT. "STUDIES OF GANODERMA LUCIDUM AND GANODERMA TSUGAE (DELIGNIFICATION, MATING SYSTEMS, ROOT ROT, CULTURAL MORPHOLOGY, TAXONOMY)." Diss., The University of Arizona, 1986. http://hdl.handle.net/10150/188172.

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Ganoderma lucidum and G. tsugae are two members of the G. lucidum complex. The authenticity of the two wood-rotting species was demonstrated by comparative studies. Ganoderma lucidum is restricted to hardwoods. Its "smooth" walled basidiospores were characterized by narrow, numerous inter-wall pillars. Isolates of G. lucidum produced chlamydospores in culture and had an average growth of 7.8 mm/da at their optimum temperature range of 30-34 C. Ganoderma tsugae is restricted to conifers. Its basidiospores were "rough" walled and had broad inter-wall pillars. Isolates of G. tsugae did not produc

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12

Quader, M. M. A. "Improvement of the alkaline delignification of wood and nonwood raw materials for pulp production /." Åbo : Åbo akademi university, 2003. http://catalogue.bnf.fr/ark:/12148/cb40116564x.

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13

Sjödahl, Ragnar. "Some aspects on the effects of dissolved wood components in kraft pulping." Doctoral thesis, KTH, Träkemi och massateknologi, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3868.

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During kraft cooking a significant part of the wood material, especially lignin and hemicelluloses, is degraded and dissolved in the cooking liquor, rendering a broad range of degradation products with different molecular mass and functional groups. The main part of this thesis has been devoted to clarify the role of these dissolved wood components (DWC) during kraft cooking. The investigations have covered their influence on e.g. the delignification rate, pulp yield, point of defibration, unbleached pulp c olour and pulp bleachability, i.e. the amount of bleaching chemicals consumed per kappa

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14

Gustavsson, Maria. "The Significance of Liquor-to-Wood Ratio on the Reaction Kinetics of Spruce Sulphate Pulping." Thesis, Karlstad University, Faculty of Technology and Science, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-805.

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<p>In 1957 Vroom presented an article that dealt with the kinetics of the sulphate cook. He showed that the lignin dissolution exhibited a temperature/time dependency that could be explained by the Arrhenius equation and that the reaction was of first order with respect to lignin. However, even before Vroom introduced the H-factor all wood components were assumed to react according to a first order reaction. In recent years progresses in this area have been made. Lignin for example is nowadays considered to dissolve during three parallel first order reactions, all with differences in activatio

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15

Haynes, Kaaren K. "Physical properties of laccase-mediator delignified pulps." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/5884.

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16

Froass, Peter Michael. "Structural changes in lignin during kraft pulping and chlorine dioxide bleaching." Diss., Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/7031.

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17

Zawadzki, Michael A. "Quantitative determination of quinone chromophore changes during ECF bleaching of kraft pulp." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/7094.

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18

Ambert, Katia. "Étude ultrastructurale de la dégradation des fibres lignocellulosiques par le champignon filamenteux Phlebia radiata." Grenoble 1, 1996. http://www.theses.fr/1996GRE10036.

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Phlebia radiata est un basidiomycete du groupe des champignons de la pourriture blanche, seuls microorganismes connus capables de degrader totalement la lignine du bois. A l'aide de la microscopie electronique a transmission associee a des techniques cytochimiques, nous avons pu mettre en evidence differents modes de degradation provoques par le champignon au cours de l'attaque d'echantillons de bouleau et de peuplier: il peut soit attaquer selectivement la lignine, en provoquant un amincissement progressif des parois secondaires des fibres et / ou en degradant les lamelles mitoyennes, soit de

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19

Burlat, Vincent. "Étude immunocytochimique de la distribution ultrastructurale des lignines dans la paille de blé et de son influence sur le mode d'action des champignons ligninolytiques : application aux pâtes à papier." Université Joseph Fourier (Grenoble ; 1971-2015), 1997. http://www.theses.fr/1997GRE10100.

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Les champignons basidiomycetes filamenteux sont parmi les plus performants pour la degradation de la lignine. Ils doivent leur activite a un complexe enzymatique au sein duquel trois enzymes jouent un role fondamental dans les mecanismes d'oxydation de la lignine. Il s'agit des lignines peroxydases (lip), des manganese peroxydases (mnp) et des laccases (lac). Trois souches fongiques, phlebia radiata (lip, mnp, lac), ceriporiopsis subvermispora (mnp, lac) et pleurotus eryngii (mnp, lac), ont ete selectionnees pour leur aptitude a degrader la paille de ble, dans le but d'utiliser les enzymes les

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20

Soares, Belinda Isabel Gomes. "Development of an innovative technology for wood delignification with eutectic solvents." Doctoral thesis, 2019. http://hdl.handle.net/10773/30287.

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The goal of this work was to study the use of Eutectic Solvents (ESs) for wood fractionation aiming at their application on pulping processes, in the biorefinery framework. To achieve this purpose, fundamental studies were performed to better understand the solubility of lignin monomer model compounds (syringaldehyde and syringic, vanillic and ferulic acids) and technical lignins (kraft and organosolv) in ESs and their aqueous solutions. Particularly, aqueous solutions of propionic acid:urea (2:1) at 50 or 75 wt % of concentration and 353.15 K improved lignin solubility by two orders of magnit

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21

Gyenge, Elod Lajos. "In-situ delignification of wood pulp by electrochemically generated Mn(III)CyDTA." Thesis, 1995. http://hdl.handle.net/2429/3553.

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The present work consisted of three parts, i.e. cyclic voltammetric investigation of the electrochemical behavior of Mn(III)CyDTA, development of a new, electrochemical method of Mn(IH)CyDTA synthesis in alkaline media and in-situ electrochemically mediated oxygen bleaching of softwood kraft pulp with the Mn(III)CyDTA complex. The cyclic voltammograms of Mn(III)CyDTA were recorded on three electrodes, i.e. graphite disk, stainless steel wire and platinum wire, as a function of pH (5 to 13.5) and scan rate (jo : 33.34 mV/s to 166.67 mV/s) at 25 °C. The presence of sodium bicarbonate (NaH

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22

Lehringer, Christian. "Permeability improvement of Norway spruce wood with the white rot fungus Physisporinus vitreus." Thesis, 2011. http://hdl.handle.net/11858/00-1735-0000-0006-B144-8.

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