Search for dissertations about: "Kraft lignin"

Showing result 21 - 25 of 122 swedish dissertations containing the words Kraft lignin.

  2. 21. The Use of Lignin Derivatives to Improve Selected Paper Properties

    Author : Stefan Antonsson; Mikael E. Lindström; Gunnar Henriksson; Mats Johansson; Docent Roland Agnemo Tek. Dr. Harald Brelid; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; kraft lignin; black liquor; cross-flow filtration; lignin derivative; kraftliner; oxidative coupling; laccase; manganese; linseed oil; mechano-sorptive creep; kraftlignin; svartlut; tvärsflödesfiltrering; ligninderivat; kraftliner; oxidativ koppling; lackas; mangan; linolja; mekanosorptivt kryp; Cellulose and paper engineering; Cellulosa- och pappersteknik;

    Abstract : Ved består huvudsakligen av tre typer av polymerer, cellulosa, hemicellulosa och lignin. Lignin bildas i naturen genom enzymatiskt initierad oxidativ koppling av tre olika typer av fenylpropan-enheter. Dessa bygger genom olika kol-kol- och kol-syre-bindningar upp en amorf tredimensionell polymer. READ MORE

  4. 22. Mass transfer challenges in wood decomposition

    Author : Roujin Ghaffari; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; diffusion cells; kraft process; lignin; lignin transport;

    Abstract : Even though the kraft cooking operation is more than 100 years old, the rate-determining step of this operation has not been fully elucidated. Recent studies point in the direction of mass transport of liberated lignin fragments from the fibers' walls into black liquor being influential in rate determination of kraft cooking. READ MORE

  5. 23. Kraft lignin valorization by hydrotreatment over Mo-based sulfided catalysts

    Author : Muhammad Abdus Salam; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Char; Bio-oil; Kraft Lignin; Hydrodeoxygenation; Y-zeolite; Metal sulfide; Depolymerization; Acidity;

    Abstract : The production of green fuels and chemicals from bio-based feedstock can suppress the dependency on fossil resources and help mitigate global climate challenges. Kraft lignin is a thermochemically modified natural lignin obtained from the pulping process as a byproduct. READ MORE

  6. 24. Kraft Pulp Fibre Surfaces. Chemical Composition and Effect on Pulp Bleachability

    Author : Anette Heijnesson Hultén; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Ray cells; carbohydrates; Kraft pulps; enzymes; lignin; fibre surfaces; metal ions; bleachability;

    Abstract : The work presented in this thesis concerns studies of kraft fibre surfaces in respect of chemical composition and effect on pulp bleachability. Kraft fibre surfaces were studied by mechanical peeling using a disintegrator operated at 20.000-200.000 revolutions and a pulp consistency of 3% or 4. READ MORE

  7. 25. Some aspects on the physical chemistry of kraft lignins in aqueous solutions : Theoretical considerations and practical implications

    Author : Magnus Norgren; Mittuniversitetet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; kraft pulping; kraft lignin; phenolic groups; dissociation; pKa; molecular weight; temperature; ionic strength; pOH; polydispersity; coagulation; Poisson-Boltzmann; DLVO; Chemistry; Kemi;

    Abstract : .... READ MORE