Sökning: "Xylan"

Visar resultat 1 - 5 av 70 avhandlingar innehållade ordet Xylan.

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

    Detta är en avhandling från Stockholm : KTH

    Författare :Sverker Danielsson; KTH.; [2007]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Xylan; Kraft cooking; Paper strength; Sheet density; Methylglucuronic acid; Hexenuronic acid; TECHNOLOGY Chemical engineering Chemical process and manufacturing engineering Cellulose and paper engineering; TEKNIKVETENSKAP Kemiteknik Kemisk process- och produktionsteknik 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

    Detta är en avhandling från Stockholm : KTH

    Författare :Espen Ribe; [2010]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Kraft cooking; Black liquor; Sorption; Sorption conditions; Xylan; Kinetics; Yield; Modelling; Hemicellulose;

    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

    Detta är en avhandling från Stockholm : KTH

    Författare :Peter Westbye; []
    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

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Zheng Jansson; KTH.; [2013]
    Nyckelord :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. Adsorption of xylans on cellulosic fibres -Influence of xylan composition on adsorption characteristics and kraft pulp properties

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Tobias Köhnke; [2010]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Xylan; Hornification; Lignin-carbohydrate complexes; Cationization; Isolation; Softwood kraft pulp; Extraction; Adsorption;

    Sammanfattning : Xylans are polysaccharides present in large amounts in cell walls of vascular plants. They possess an inherent affinity to cellulose and will thus adsorb irreversibly on cellulose surfaces. LÄS MER