Search for dissertations about: "Bleachability"

Showing result 1 - 5 of 12 swedish dissertations containing the word Bleachability.

  1. 1. Some aspects on TCF-bleachability of softwood alkaline pulps

    University dissertation from Stockholm : KTH

    Author : Karin Sjöström; [1999]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Bleachability; chlorine-free bleaching; softwoods; kraft pulps; alkaline sulfite pulps; oxygen; hydrogen peroxide; ozone; hydrogen sulfide ion; hydroxide ion; temperature; sodium ion.; TECHNOLOGY Chemical engineering Chemical process and manufacturing engineering Cellulose and paper engineering; TEKNIKVETENSKAP Kemiteknik Kemisk process- och produktionsteknik Cellulosa- och pappersteknik;

    Abstract : The bleachability of softwood oxygen delignified pulps has been studied, i.e. the ease (requirement of bleaching chemicals) with which the pulps can be brightened to a target brightness in totally chlorine free (TCF) bleaching stages, including hydrogen peroxide, ozone and chelating agent stages. READ MORE

  2. 2. Kraft Pulp Fibre Surfaces. Chemical Composition and Effect on Pulp Bleachability

    University dissertation from Stockholm : KTH

    Author : Anette Heijnesson Hultén; [1996]
    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

  3. 3. On the bleachability of alkaline pulps. The influence of residual lignin structure

    University dissertation from Institutionen för pappers- och massateknologi

    Author : Waleed Wafa Al-Dajani; [2001]
    Keywords : B-O-4; bleachability; hexenuronic acid; hydrogen peroxide; hydrosulfide ion; hydroxyl ion; ionic strength; residual lignin.;

    Abstract : .... READ MORE

  4. 4. On the Interrelation Between Kraft Cooking Conditions and Pulp Composition

    University dissertation from Stockholm : KTH

    Author : Catrin Gustavsson; Mikael E. Lindström; Jorge Colodette; [2006]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Delignification; Kraft pulping; Residual phase lignin; Hydroxide; Hydrogen sulphide ion; Ionic strength; Temperature; Bleachability; Hexenuronic acid; Carbohydrates; TECHNOLOGY Chemical engineering Chemical process and manufacturing engineering Cellulose and paper engineering; TEKNIKVETENSKAP Kemiteknik Kemisk process- och produktionsteknik Cellulosa- och pappersteknik;

    Abstract : In the early 1990’s, a lot of work was focused on extending the kraft cook to a low lignin content (low kappa number). The driving force was the need to further reduce the environmental impact of the bleaching, as less delignification work would be needed there. READ MORE

  5. 5. Delignification and bleachability of kraft pulps pretreated with nitrogen dioxide

    University dissertation from Stockholm : KTH

    Author : Per Larsson; [1992]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; chlorine dioxide; oxygen bleaching; molecular mass; paper properties; ozone bleaching; nitrogen dioxide; kraft pulps; pretreatment; gel permeation chromatography; indulin AT; hydrogen peroxide; consecutive alkaline extractions;

    Abstract : .... READ MORE