Search for dissertations about: "Bleaching"

Showing result 1 - 5 of 105 swedish dissertations containing the word Bleaching.

  1. 1. TCF Bleaching of Softwood Kraft Pulp. Metal Management Procedures

    Author : Harald Brelid; [1998]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; bleaching; manganese; Kraft pulps; iron; copper; hydrogen peroxide; acid pretreatment; calcium; magnesium; liquid chromatography; ion exchange; metal complexes; EDTA;

    Abstract : The aim of this work has been to increase knowledge of the influence of the metal ion content in softwood kraft pulp on peroxide bleaching and to investigate the effects of different metal management procedures at various stages in the production of TCF pulps (i.e. READ MORE

  2. 2. Totally chlorine free bleaching of softwood kraft pulp : inhomogeneous ozone bleaching and particle elimination

    University dissertation from Institutionen för pappers- och massateknologi

    Author : Maria Ström; [1997]
    Keywords : ;

    Abstract : .... READ MORE

  3. 3. The link between kraft cooking and bleaching : influence on ECF bleachabiblity and bleaching effluent parameters

    University dissertation from Karlstad : Karlstad University Studies

    Author : Magnus Björklund; [2004]
    Keywords : ;

    Abstract : The link between kraft cooking and bleaching was investigated, with the focus on how cooking kappa number, cooking conditions and pre-bleaching stages influence ECF bleachability and environmental parameters in the bleaching effluent. In one part of the study standard cooking conditions were used to produce birch and spruce pulps of different kappa numbers and then we studied how the AOX in the ECF bleaching effluent was affected by oxygen delignification, and hot acid stages. READ MORE

  4. 4. Zeolites in pulp bleaching

    University dissertation from Luleå : Luleå tekniska universitet

    Author : Kurt Dyhr; [1998]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Kemisk teknologi; Chemical Technology;

    Abstract : .... READ MORE

  5. 5. Free radical mediated cellulose degradation

    University dissertation from Stockholm : Kemi

    Author : Erik Johansson; [2003]
    Keywords : free radicals; cellulose; polymer; average chain length; bleaching; TCF; ozone; degradation;

    Abstract : This thesis addresses the mechanisms involved in cellulosedegradation in general and Totally Chlorine Free (TCF) bleachingof pulp in particular. The thesis shows that the cellulosedegradation during high consistency ozone bleaching is explainedby free radical chain reactions. READ MORE