Sökning: "xylan"

Visar resultat 1 - 5 av 84 avhandlingar innehållade ordet xylan.

  1. 1. Xylan Reactions in Kraft Cooking : Process and Product Considerations

    Författare :Sverker Danielsson; Mikael Lindström; Richard Gustafson; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Xylan; Kraft cooking; Paper strength; Sheet density; Methylglucuronic acid; Hexenuronic acid; Cellulose and paper engineering; Cellulosa- och pappersteknik;

    Sammanfattning : Xylan is the main hemicellulose in birch, eucalyptus, and most other hardwood species. During kraft pulping a series of chemical reactions and physical processes involving xylan takes place. LÄS MER

  2. 2. Xylan sorption kinetics at industrial conditions

    Författare :Espen Ribe; Chalmers University of Technology; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Sorption; Yield; Sorption conditions; Kinetics; Kraft cooking; Hemicellulose; Modelling; Black liquor; Xylan;

    Sammanfattning : The kraft process is the most utilised method for the production of wood based chemical pulp for paper applications. During a kraft cook about half of the wood material is dissoluted into the cooking liquor making the liberation of individual fibres possible. This low yield is a great disadvantage for process economy. LÄS MER

  3. 3. Assembly characteristics of xylan rich extracts from birch

    Författare :Peter Westbye; Chalmers University of Technology; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Xylan; Cellulose fibres; Adsorption; glucuronoxylan; Extraction; Aggregates; Solution properties;

    Sammanfattning : The greenhouse effect is one of the most important environmental problems that mankind has to solve. One solution could be the utilization of biomass to create new materials and fuels. Traditionally wood has been used as timber and as a raw material for pulp and paper production. LÄS MER

  4. 4. Characterization of Spruce Xylan and Its Potential for Strength Improvement

    Författare :Zheng Jansson; Elisabet Brännvall; Mikael Lindström; Hannes Vomhoff; Ulrica Edlund; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; xylan; paper strength;

    Sammanfattning : Xylan dissolved during kraft cooking and later redeposited on fibre surfaces has been shown to give higher pulp yield and better strength properties. This is economically interesting from an industrial point of view. LÄS MER

  5. 5. Effect of molecular architecture of xylan on materials properties

    Författare :Maria Gröndahl; Chalmers University of Technology; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; xylan; water content; arabinoxylan; oxygen permeability; mechanical properties; thermal properties; glucuronoxylan;

    Sammanfattning : .... LÄS MER