Search for dissertations about: "Kraft cooking"

Showing result 21 - 25 of 54 swedish dissertations containing the words Kraft cooking.

  2. 21. On the importance of oxidizable structures in bleached kraft pulps

    Author : Olena Sevastyanova; Göran Gellerstedt; Colodette Jorge; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; bleached pulps; betula; eucalyptus; 5-formyl-2furancarboxylic acid; 2-furancarboxylic acid; hexenuronic acid; kappa number; kraft pulps; oxidation equivalents; Cellulose and paper engineering; Cellulosa- och pappersteknik;

    Abstract : After cooking, kraft pulps always contain not only residual lignin but also significant amounts of hexenuronic acid and other non-lignin structures oxidizable by permanganate under the standard kappa number determination conditions. These here referred to as false lignin. READ MORE

  4. 22. Mild Steam Explosion of Norway Spruce

    Author : Kerstin Jedvert; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; kraft cooking; biorefinery; steam explosion; galacto glucomannan; Norway spruce;

    Abstract : The most common wood species in Sweden, and one of the most important renewable raw materials in Northern Europe, is Norway spruce (Picea abies). Today, it is utilized mainly for sawed timber and the production of pulp and paper. READ MORE

  5. 23. 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

  6. 24. Inorganic ions in wood chips- Leaching prior to Kraft pulping and effect of calcium on Kraft delignification

    Author : Anna Saltberg; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; modelling; calcium; Scandinavian softwood; Keywords: Kraft pulping; potassium; birch; eucalyptus; aspen; acidic leaching; oxalate.;

    Abstract : Wood is the main source of Non-Process Elements (NPEs), such as, calcium, potassium, manganese and chloride in Kraft pulp mills. Due to the recirculation of cooking chemicals and water, process disturbances related to the accumulation of NPEs in the process streams are inevitable. READ MORE

  7. 25. Improved Usage of Wood Raw Material through Modification of the Kraft Process

    Author : Daniel Tavast; Elisabet Brännvall; Mikael Lindström; Martin Lawoko; Kerstin Forsberg; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; kraft process; impregnation; xylan; spruce; Chemical Engineering; Kemiteknik;

    Abstract :    The kraft process is a complex system with many variables, and though the process is fairly well understood, there is still much we do not know.    This thesis examines some aspects of the kraft process that could prove to be of interest for the pulp and paper industry, specifically, the impact of wood chip impregnation and of the chemical structure of xylan on spruce kraft pulp. READ MORE